增加新的统一下单接口，并添加对接口格式的单元测试，并未对实际功能进行测试

weixin-java-common/src/main/java/me/chanjar/weixin/common/util/http/SimplePostRequestExecutor.java

@@ -35,6 +35,12 @@ public class SimplePostRequestExecutor implements RequestExecutor<String, String
 
     try (CloseableHttpResponse response = httpclient.execute(httpPost)) {
       String responseContent = Utf8ResponseHandler.INSTANCE.handleResponse(response);
+      if (responseContent.isEmpty()) {
+        throw new WxErrorException(
+            WxError.newBuilder().setErrorCode(9999).setErrorMsg("无响应内容")
+                .build());
+      }
+
       if (responseContent.startsWith("<xml>")) {
         //xml格式输出直接返回
         return responseContent;

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/WxMpPayService.java

@@ -6,10 +6,11 @@ import me.chanjar.weixin.common.exception.WxErrorException;
 import me.chanjar.weixin.mp.bean.pay.WxMpPayCallback;
 import me.chanjar.weixin.mp.bean.pay.WxMpPayRefundResult;
 import me.chanjar.weixin.mp.bean.pay.WxMpPayResult;
+import me.chanjar.weixin.mp.bean.pay.WxMpPrepayIdResult;
 import me.chanjar.weixin.mp.bean.pay.WxRedpackResult;
 import me.chanjar.weixin.mp.bean.pay.WxSendRedpackRequest;
 import me.chanjar.weixin.mp.bean.pay.WxUnifiedOrderRequest;
-import me.chanjar.weixin.mp.bean.result.WxMpPrepayIdResult;
+import me.chanjar.weixin.mp.bean.pay.WxUnifiedOrderResult;
 
 /**
  *  微信支付相关接口
@@ -48,9 +49,11 @@ public interface WxMpPayService {
    * 统一下单(详见http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)
    * 在发起微信支付前，需要调用统一下单接口，获取"预支付交易会话标识"
    * 接口地址：https://api.mch.weixin.qq.com/pay/unifiedorder
+   * @throws WxErrorException 
    *
    */
-  WxMpPrepayIdResult unifiedOrder(WxUnifiedOrderRequest request);
+  WxUnifiedOrderResult unifiedOrder(WxUnifiedOrderRequest request)
+      throws WxErrorException;
 
   /**
    * 该接口调用“统一下单”接口，并拼装发起支付请求需要的参数

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/impl/WxMpPayServiceImpl.java

@@ -3,6 +3,7 @@ package me.chanjar.weixin.mp.api.impl;
 import java.io.IOException;
 import java.lang.reflect.Field;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.SortedMap;
@@ -20,10 +21,12 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.slf4j.helpers.MessageFormatter;
 
+import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.thoughtworks.xstream.XStream;
 import com.thoughtworks.xstream.annotations.XStreamAlias;
 
+import me.chanjar.weixin.common.annotation.Required;
 import me.chanjar.weixin.common.bean.result.WxError;
 import me.chanjar.weixin.common.exception.WxErrorException;
 import me.chanjar.weixin.common.util.http.Utf8ResponseHandler;
@@ -32,9 +35,11 @@ import me.chanjar.weixin.mp.api.WxMpPayService;
 import me.chanjar.weixin.mp.bean.pay.WxMpPayCallback;
 import me.chanjar.weixin.mp.bean.pay.WxMpPayRefundResult;
 import me.chanjar.weixin.mp.bean.pay.WxMpPayResult;
+import me.chanjar.weixin.mp.bean.pay.WxMpPrepayIdResult;
 import me.chanjar.weixin.mp.bean.pay.WxRedpackResult;
 import me.chanjar.weixin.mp.bean.pay.WxSendRedpackRequest;
-import me.chanjar.weixin.mp.bean.result.WxMpPrepayIdResult;
+import me.chanjar.weixin.mp.bean.pay.WxUnifiedOrderRequest;
+import me.chanjar.weixin.mp.bean.pay.WxUnifiedOrderResult;
 
 /**
  * Created by Binary Wang on 2016/7/28.
@@ -43,10 +48,12 @@ import me.chanjar.weixin.mp.bean.result.WxMpPrepayIdResult;
  */
 public class WxMpPayServiceImpl implements WxMpPayService {
 
+  private static final List<String> TRADE_TYPES = Lists.newArrayList("JSAPI",
+      "NATIVE", "APP");
   private final Logger log = LoggerFactory.getLogger(WxMpPayServiceImpl.class);
-  private final String[] REQUIRED_ORDER_PARAMETERS = new String[]{"appid",
+  private final String[] REQUIRED_ORDER_PARAMETERS = new String[] { "appid",
-          "mch_id", "body", "out_trade_no", "total_fee", "spbill_create_ip",
+      "mch_id", "body", "out_trade_no", "total_fee", "spbill_create_ip",
-          "notify_url", "trade_type"};
+      "notify_url", "trade_type" };
   private HttpHost httpProxy;
   private WxMpServiceImpl wxMpService;
 
@@ -58,13 +65,13 @@ public class WxMpPayServiceImpl implements WxMpPayService {
   @Override
   @Deprecated
   public WxMpPrepayIdResult getPrepayId(String openId, String outTradeNo,
-                                        double amt, String body, String tradeType, String ip,
+      double amt, String body, String tradeType, String ip,
-                                        String callbackUrl) {
+      String callbackUrl) {
     Map<String, String> packageParams = new HashMap<>();
     packageParams.put("appid",
-            this.wxMpService.getWxMpConfigStorage().getAppId());
+        this.wxMpService.getWxMpConfigStorage().getAppId());
     packageParams.put("mch_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
     packageParams.put("body", body);
     packageParams.put("out_trade_no", outTradeNo);
     packageParams.put("total_fee", (int) (amt * 100) + "");
@@ -77,47 +84,48 @@ public class WxMpPayServiceImpl implements WxMpPayService {
   }
 
   @Override
+  @Deprecated
   public WxMpPrepayIdResult getPrepayId(final Map<String, String> parameters) {
     final SortedMap<String, String> packageParams = new TreeMap<>(parameters);
     packageParams.put("appid",
-            this.wxMpService.getWxMpConfigStorage().getAppId());
+        this.wxMpService.getWxMpConfigStorage().getAppId());
     packageParams.put("mch_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
     packageParams.put("nonce_str", System.currentTimeMillis() + "");
     checkParameters(packageParams);
 
     String sign = this.createSign(packageParams,
-            this.wxMpService.getWxMpConfigStorage().getPartnerKey());
+        this.wxMpService.getWxMpConfigStorage().getPartnerKey());
     packageParams.put("sign", sign);
 
     StringBuilder request = new StringBuilder("<xml>");
     for (Map.Entry<String, String> para : packageParams.entrySet()) {
       request.append(String.format("<%s>%s</%s>", para.getKey(),
-              para.getValue(), para.getKey()));
+          para.getValue(), para.getKey()));
     }
 
     request.append("</xml>");
 
     HttpPost httpPost = new HttpPost(
-            "https://api.mch.weixin.qq.com/pay/unifiedorder");
+        "https://api.mch.weixin.qq.com/pay/unifiedorder");
     if (this.httpProxy != null) {
       RequestConfig config = RequestConfig.custom().setProxy(this.httpProxy)
-              .build();
+          .build();
       httpPost.setConfig(config);
     }
 
     StringEntity entity = new StringEntity(request.toString(), Consts.UTF_8);
     httpPost.setEntity(entity);
     try (CloseableHttpResponse response = this.wxMpService.getHttpclient()
-            .execute(httpPost)) {
+        .execute(httpPost)) {
       String responseContent = Utf8ResponseHandler.INSTANCE
-              .handleResponse(response);
+          .handleResponse(response);
       XStream xstream = XStreamInitializer.getInstance();
       xstream.alias("xml", WxMpPrepayIdResult.class);
       return (WxMpPrepayIdResult) xstream.fromXML(responseContent);
     } catch (IOException e) {
       throw new RuntimeException("Failed to get prepay id due to IO exception.",
-              e);
+          e);
     } finally {
       httpPost.releaseConnection();
     }
@@ -127,33 +135,33 @@ public class WxMpPayServiceImpl implements WxMpPayService {
     for (String para : this.REQUIRED_ORDER_PARAMETERS) {
       if (!parameters.containsKey(para)) {
         throw new IllegalArgumentException(
-                "Reqiured argument '" + para + "' is missing.");
+            "Reqiured argument '" + para + "' is missing.");
       }
     }
 
     if ("JSAPI".equals(parameters.get("trade_type"))
-            && !parameters.containsKey("openid")) {
+        && !parameters.containsKey("openid")) {
       throw new IllegalArgumentException(
-              "Reqiured argument 'openid' is missing when trade_type is 'JSAPI'.");
+          "Reqiured argument 'openid' is missing when trade_type is 'JSAPI'.");
     }
 
     if ("NATIVE".equals(parameters.get("trade_type"))
-            && !parameters.containsKey("product_id")) {
+        && !parameters.containsKey("product_id")) {
       throw new IllegalArgumentException(
-              "Reqiured argument 'product_id' is missing when trade_type is 'NATIVE'.");
+          "Reqiured argument 'product_id' is missing when trade_type is 'NATIVE'.");
     }
   }
 
   @Override
   @Deprecated
   public Map<String, String> getJsapiPayInfo(String openId, String outTradeNo,
-                                             double amt, String body, String ip, String callbackUrl)
+      double amt, String body, String ip, String callbackUrl)
-          throws WxErrorException {
+      throws WxErrorException {
     Map<String, String> packageParams = new HashMap<>();
     packageParams.put("appid",
-            this.wxMpService.getWxMpConfigStorage().getAppId());
+        this.wxMpService.getWxMpConfigStorage().getAppId());
     packageParams.put("mch_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
     packageParams.put("body", body);
     packageParams.put("out_trade_no", outTradeNo);
     packageParams.put("total_fee", (int) (amt * 100) + "");
@@ -168,13 +176,13 @@ public class WxMpPayServiceImpl implements WxMpPayService {
   @Override
   @Deprecated
   public Map<String, String> getNativePayInfo(String productId,
-                                              String outTradeNo, double amt, String body, String ip, String callbackUrl)
+      String outTradeNo, double amt, String body, String ip, String callbackUrl)
-          throws WxErrorException {
+      throws WxErrorException {
     Map<String, String> packageParams = new HashMap<>();
     packageParams.put("appid",
-            this.wxMpService.getWxMpConfigStorage().getAppId());
+        this.wxMpService.getWxMpConfigStorage().getAppId());
     packageParams.put("mch_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
     packageParams.put("body", body);
     packageParams.put("out_trade_no", outTradeNo);
     packageParams.put("total_fee", (int) (amt * 100) + "");
@@ -188,27 +196,27 @@ public class WxMpPayServiceImpl implements WxMpPayService {
 
   @Override
   public Map<String, String> getPayInfo(Map<String, String> parameters)
-          throws WxErrorException {
+      throws WxErrorException {
     WxMpPrepayIdResult wxMpPrepayIdResult = getPrepayId(parameters);
 
     if (!"SUCCESS".equalsIgnoreCase(wxMpPrepayIdResult.getReturn_code())
-            || !"SUCCESS".equalsIgnoreCase(wxMpPrepayIdResult.getResult_code())) {
+        || !"SUCCESS".equalsIgnoreCase(wxMpPrepayIdResult.getResult_code())) {
       WxError error = new WxError();
       error.setErrorCode(-1);
       error.setErrorMsg("return_code:" + wxMpPrepayIdResult.getReturn_code()
-              + ";return_msg:" + wxMpPrepayIdResult.getReturn_msg()
+          + ";return_msg:" + wxMpPrepayIdResult.getReturn_msg()
-              + ";result_code:" + wxMpPrepayIdResult.getResult_code() + ";err_code"
+          + ";result_code:" + wxMpPrepayIdResult.getResult_code() + ";err_code"
-              + wxMpPrepayIdResult.getErr_code() + ";err_code_des"
+          + wxMpPrepayIdResult.getErr_code() + ";err_code_des"
-              + wxMpPrepayIdResult.getErr_code_des());
+          + wxMpPrepayIdResult.getErr_code_des());
       throw new WxErrorException(error);
     }
 
     String prepayId = wxMpPrepayIdResult.getPrepay_id();
     if (prepayId == null || prepayId.equals("")) {
       throw new RuntimeException(
-              String.format("Failed to get prepay id due to error code '%s'(%s).",
+          String.format("Failed to get prepay id due to error code '%s'(%s).",
-                      wxMpPrepayIdResult.getErr_code(),
+              wxMpPrepayIdResult.getErr_code(),
-                      wxMpPrepayIdResult.getErr_code_des()));
+              wxMpPrepayIdResult.getErr_code_des()));
     }
 
     Map<String, String> payInfo = new HashMap<>();
@@ -223,21 +231,21 @@ public class WxMpPayServiceImpl implements WxMpPayService {
     }
 
     String finalSign = this.createSign(payInfo,
-            this.wxMpService.getWxMpConfigStorage().getPartnerKey());
+        this.wxMpService.getWxMpConfigStorage().getPartnerKey());
     payInfo.put("paySign", finalSign);
     return payInfo;
   }
 
   @Override
   public WxMpPayResult getJSSDKPayResult(String transactionId,
-                                         String outTradeNo) {
+      String outTradeNo) {
     String nonce_str = System.currentTimeMillis() + "";
 
     SortedMap<String, String> packageParams = new TreeMap<>();
     packageParams.put("appid",
-            this.wxMpService.getWxMpConfigStorage().getAppId());
+        this.wxMpService.getWxMpConfigStorage().getAppId());
     packageParams.put("mch_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
 
     if (transactionId != null && !"".equals(transactionId.trim())) {
       packageParams.put("transaction_id", transactionId);
@@ -245,40 +253,40 @@ public class WxMpPayServiceImpl implements WxMpPayService {
       packageParams.put("out_trade_no", outTradeNo);
     } else {
       throw new IllegalArgumentException(
-              "Either 'transactionId' or 'outTradeNo' must be given.");
+          "Either 'transactionId' or 'outTradeNo' must be given.");
     }
 
     packageParams.put("nonce_str", nonce_str);
     packageParams.put("sign", this.createSign(packageParams,
-            this.wxMpService.getWxMpConfigStorage().getPartnerKey()));
+        this.wxMpService.getWxMpConfigStorage().getPartnerKey()));
 
     StringBuilder request = new StringBuilder("<xml>");
     for (Map.Entry<String, String> para : packageParams.entrySet()) {
       request.append(String.format("<%s>%s</%s>", para.getKey(),
-              para.getValue(), para.getKey()));
+          para.getValue(), para.getKey()));
     }
     request.append("</xml>");
 
     HttpPost httpPost = new HttpPost(
-            "https://api.mch.weixin.qq.com/pay/orderquery");
+        "https://api.mch.weixin.qq.com/pay/orderquery");
     if (this.httpProxy != null) {
       RequestConfig config = RequestConfig.custom().setProxy(this.httpProxy)
-              .build();
+          .build();
       httpPost.setConfig(config);
     }
 
     StringEntity entity = new StringEntity(request.toString(), Consts.UTF_8);
     httpPost.setEntity(entity);
     try (CloseableHttpResponse response = this.wxMpService.getHttpclient()
-            .execute(httpPost)) {
+        .execute(httpPost)) {
       String responseContent = Utf8ResponseHandler.INSTANCE
-              .handleResponse(response);
+          .handleResponse(response);
       XStream xstream = XStreamInitializer.getInstance();
       xstream.alias("xml", WxMpPayResult.class);
       return (WxMpPayResult) xstream.fromXML(responseContent);
     } catch (IOException e) {
       throw new RuntimeException("Failed to query order due to IO exception.",
-              e);
+          e);
     }
   }
 
@@ -297,66 +305,66 @@ public class WxMpPayServiceImpl implements WxMpPayService {
 
   @Override
   public WxMpPayRefundResult refundPay(Map<String, String> parameters)
-          throws WxErrorException {
+      throws WxErrorException {
     SortedMap<String, String> refundParams = new TreeMap<>(parameters);
     refundParams.put("appid",
-            this.wxMpService.getWxMpConfigStorage().getAppId());
+        this.wxMpService.getWxMpConfigStorage().getAppId());
     refundParams.put("mch_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
     refundParams.put("nonce_str", System.currentTimeMillis() + "");
     refundParams.put("op_user_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
     String sign = this.createSign(refundParams,
-            this.wxMpService.getWxMpConfigStorage().getPartnerKey());
+        this.wxMpService.getWxMpConfigStorage().getPartnerKey());
     refundParams.put("sign", sign);
 
     StringBuilder request = new StringBuilder("<xml>");
     for (Map.Entry<String, String> para : refundParams.entrySet()) {
       request.append(String.format("<%s>%s</%s>", para.getKey(),
-              para.getValue(), para.getKey()));
+          para.getValue(), para.getKey()));
     }
     request.append("</xml>");
 
     HttpPost httpPost = new HttpPost(
-            "https://api.mch.weixin.qq.com/secapi/pay/refund");
+        "https://api.mch.weixin.qq.com/secapi/pay/refund");
     if (this.httpProxy != null) {
       RequestConfig config = RequestConfig.custom().setProxy(this.httpProxy)
-              .build();
+          .build();
       httpPost.setConfig(config);
     }
 
     StringEntity entity = new StringEntity(request.toString(), Consts.UTF_8);
     httpPost.setEntity(entity);
     try (CloseableHttpResponse response = this.wxMpService.getHttpclient()
-            .execute(httpPost)) {
+        .execute(httpPost)) {
       String responseContent = Utf8ResponseHandler.INSTANCE
-              .handleResponse(response);
+          .handleResponse(response);
       XStream xstream = XStreamInitializer.getInstance();
       xstream.processAnnotations(WxMpPayRefundResult.class);
       WxMpPayRefundResult wxMpPayRefundResult = (WxMpPayRefundResult) xstream
-              .fromXML(responseContent);
+          .fromXML(responseContent);
 
       if (!"SUCCESS".equalsIgnoreCase(wxMpPayRefundResult.getResultCode())
-              || !"SUCCESS".equalsIgnoreCase(wxMpPayRefundResult.getReturnCode())) {
+          || !"SUCCESS".equalsIgnoreCase(wxMpPayRefundResult.getReturnCode())) {
         WxError error = new WxError();
         error.setErrorCode(-1);
         error.setErrorMsg("return_code:" + wxMpPayRefundResult.getReturnCode()
-                + ";return_msg:" + wxMpPayRefundResult.getReturnMsg()
+            + ";return_msg:" + wxMpPayRefundResult.getReturnMsg()
-                + ";result_code:" + wxMpPayRefundResult.getResultCode()
+            + ";result_code:" + wxMpPayRefundResult.getResultCode()
-                + ";err_code" + wxMpPayRefundResult.getErrCode() + ";err_code_des"
+            + ";err_code" + wxMpPayRefundResult.getErrCode() + ";err_code_des"
-                + wxMpPayRefundResult.getErrCodeDes());
+            + wxMpPayRefundResult.getErrCodeDes());
         throw new WxErrorException(error);
       }
 
       return wxMpPayRefundResult;
     } catch (IOException e) {
       String message = MessageFormatter
-              .format("Exception happened when sending refund '{}'.",
+          .format("Exception happened when sending refund '{}'.",
-                      request.toString())
+              request.toString())
-              .getMessage();
+          .getMessage();
       this.log.error(message, e);
       throw new WxErrorException(
-              WxError.newBuilder().setErrorMsg(message).build());
+          WxError.newBuilder().setErrorMsg(message).build());
     } finally {
       httpPost.releaseConnection();
     }
@@ -364,65 +372,67 @@ public class WxMpPayServiceImpl implements WxMpPayService {
 
   @Override
   public boolean checkJSSDKCallbackDataSignature(Map<String, String> kvm,
-                                                 String signature) {
+      String signature) {
     return signature.equals(this.createSign(kvm,
-            this.wxMpService.getWxMpConfigStorage().getPartnerKey()));
+        this.wxMpService.getWxMpConfigStorage().getPartnerKey()));
   }
 
   @Override
   @Deprecated
   public WxRedpackResult sendRedpack(Map<String, String> parameters)
-          throws WxErrorException {
+      throws WxErrorException {
     SortedMap<String, String> packageParams = new TreeMap<>(parameters);
     packageParams.put("wxappid",
-            this.wxMpService.getWxMpConfigStorage().getAppId());
+        this.wxMpService.getWxMpConfigStorage().getAppId());
     packageParams.put("mch_id",
-            this.wxMpService.getWxMpConfigStorage().getPartnerId());
+        this.wxMpService.getWxMpConfigStorage().getPartnerId());
     packageParams.put("nonce_str", System.currentTimeMillis() + "");
 
     String sign = this.createSign(packageParams,
-            this.wxMpService.getWxMpConfigStorage().getPartnerKey());
+        this.wxMpService.getWxMpConfigStorage().getPartnerKey());
     packageParams.put("sign", sign);
 
     StringBuilder request = new StringBuilder("<xml>");
     for (Map.Entry<String, String> para : packageParams.entrySet()) {
       request.append(String.format("<%s>%s</%s>", para.getKey(),
-              para.getValue(), para.getKey()));
+          para.getValue(), para.getKey()));
     }
 
     request.append("</xml>");
 
     HttpPost httpPost = new HttpPost(
-            "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack");
+        "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack");
     if (this.httpProxy != null) {
       RequestConfig config = RequestConfig.custom().setProxy(this.httpProxy)
-              .build();
+          .build();
       httpPost.setConfig(config);
     }
 
     StringEntity entity = new StringEntity(request.toString(), Consts.UTF_8);
     httpPost.setEntity(entity);
     try (CloseableHttpResponse response = this.wxMpService.getHttpclient()
-            .execute(httpPost)) {
+        .execute(httpPost)) {
       String responseContent = Utf8ResponseHandler.INSTANCE
-              .handleResponse(response);
+          .handleResponse(response);
       XStream xstream = XStreamInitializer.getInstance();
       xstream.processAnnotations(WxRedpackResult.class);
       return (WxRedpackResult) xstream.fromXML(responseContent);
     } catch (IOException e) {
       String message = MessageFormatter
-              .format("Exception occured when sending redpack '{}'.",
+          .format("Exception occured when sending redpack '{}'.",
-                      request.toString())
+              request.toString())
-              .getMessage();
+          .getMessage();
       this.log.error(message, e);
-      throw new WxErrorException(WxError.newBuilder().setErrorMsg(message).build());
+      throw new WxErrorException(
+          WxError.newBuilder().setErrorMsg(message).build());
     } finally {
       httpPost.releaseConnection();
     }
   }
 
   @Override
-  public WxRedpackResult sendRedpack(WxSendRedpackRequest request) throws WxErrorException {
+  public WxRedpackResult sendRedpack(WxSendRedpackRequest request)
+      throws WxErrorException {
     XStream xstream = XStreamInitializer.getInstance();
     xstream.processAnnotations(WxSendRedpackRequest.class);
     xstream.processAnnotations(WxRedpackResult.class);
@@ -442,10 +452,13 @@ public class WxMpPayServiceImpl implements WxMpPayService {
     }
 
     String responseContent = this.wxMpService.post(url, xstream.toXML(request));
-    WxRedpackResult redpackResult = (WxRedpackResult) xstream.fromXML(responseContent);
+    WxRedpackResult redpackResult = (WxRedpackResult) xstream
-    if("FAIL".equals(redpackResult.getResultCode())){
+        .fromXML(responseContent);
-      throw new WxErrorException(
+    if ("FAIL".equals(redpackResult.getResultCode())) {
-          WxError.newBuilder().setErrorMsg(redpackResult.getErrCode() + ":" + redpackResult.getErrCodeDes()).build());
+      throw new WxErrorException(WxError.newBuilder()
+          .setErrorMsg(
+              redpackResult.getErrCode() + ":" + redpackResult.getErrCodeDes())
+          .build());
     }
 
     return redpackResult;
@@ -460,9 +473,10 @@ public class WxMpPayServiceImpl implements WxMpPayService {
       }
 
       try {
-        Field field = WxSendRedpackRequest.class.getDeclaredField(entry.getKey());
+        Field field = bean.getClass().getDeclaredField(entry.getKey());
         if (field.isAnnotationPresent(XStreamAlias.class)) {
-          result.put(field.getAnnotation(XStreamAlias.class).value(), reflect.get().toString());
+          result.put(field.getAnnotation(XStreamAlias.class).value(),
+              reflect.get().toString());
         }
       } catch (NoSuchFieldException | SecurityException e) {
         e.printStackTrace();
@@ -485,7 +499,8 @@ public class WxMpPayServiceImpl implements WxMpPayService {
     StringBuffer toSign = new StringBuffer();
     for (String key : sortedMap.keySet()) {
       String value = packageParams.get(key);
-      if (null != value && !"".equals(value) && !"sign".equals(key) && !"key".equals(key)) {
+      if (null != value && !"".equals(value) && !"sign".equals(key)
+          && !"key".equals(key)) {
         toSign.append(key + "=" + value + "&");
       }
     }
@@ -495,4 +510,73 @@ public class WxMpPayServiceImpl implements WxMpPayService {
     return DigestUtils.md5Hex(toSign.toString()).toUpperCase();
   }
 
+  @Override
+  public WxUnifiedOrderResult unifiedOrder(WxUnifiedOrderRequest request)
+      throws WxErrorException {
+    checkParameters(request);
+
+    XStream xstream = XStreamInitializer.getInstance();
+    xstream.processAnnotations(WxUnifiedOrderRequest.class);
+    xstream.processAnnotations(WxUnifiedOrderResult.class);
+
+    request.setAppid(this.wxMpService.getWxMpConfigStorage().getAppId());
+    request.setMchId(this.wxMpService.getWxMpConfigStorage().getPartnerId());
+    request.setNonceStr(System.currentTimeMillis() + "");
+
+    String sign = this.createSign(xmlBean2Map(request),
+        this.wxMpService.getWxMpConfigStorage().getPartnerKey());
+    request.setSign(sign);
+
+    String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
+
+    String responseContent = this.wxMpService.post(url, xstream.toXML(request));
+    WxUnifiedOrderResult result = (WxUnifiedOrderResult) xstream
+        .fromXML(responseContent);
+    if ("FAIL".equals(result.getResultCode())) {
+      throw new WxErrorException(WxError.newBuilder()
+          .setErrorMsg(result.getErrCode() + ":" + result.getErrCodeDes())
+          .build());
+    }
+
+    return result;
+
+  }
+
+  private void checkParameters(WxUnifiedOrderRequest request) {
+
+    List<String> nullFields = com.google.common.collect.Lists.newArrayList();
+    for (Entry<String, Reflect> entry : Reflect.on(request).fields()
+        .entrySet()) {
+      Reflect reflect = entry.getValue();
+      try {
+        Field field = request.getClass().getDeclaredField(entry.getKey());
+        if (field.isAnnotationPresent(Required.class)
+            && reflect.get() == null) {
+          nullFields.add(entry.getKey());
+        }
+      } catch (NoSuchFieldException | SecurityException e) {
+        e.printStackTrace();
+      }
+    }
+
+    if (!nullFields.isEmpty()) {
+      throw new IllegalArgumentException("必填字段[" + nullFields + "]必须提供值");
+    }
+
+    if (!TRADE_TYPES.contains(request.getTradeType())) {
+      throw new IllegalArgumentException(
+          "trade_type目前必须为" + TRADE_TYPES + "其中之一");
+
+    }
+
+    if ("JSAPI".equals(request.getTradeType()) && request.getOpenid() == null) {
+      throw new IllegalArgumentException("当 trade_type是'JSAPI'时未指定openid");
+    }
+
+    if ("NATIVE".equals(request.getTradeType())
+        && request.getProductId() == null) {
+      throw new IllegalArgumentException("当 trade_type是'NATIVE'时未指定product_id");
+    }
+  }
+
 }

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/pay/WxMpPrepayIdResult.java

@@ -0,0 +1,124 @@
+package me.chanjar.weixin.mp.bean.pay;
+
+import java.io.Serializable;
+
+/**
+ * <pre>
+ * 在发起微信支付前，需要调用统一下单接口，获取"预支付交易会话标识"返回的结果
+ * 统一下单(详见http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)
+ * </pre>
+ *
+ * @author chanjarster
+ */
+@Deprecated
+public class WxMpPrepayIdResult implements Serializable {
+  private static final long serialVersionUID = -8970574397788396143L;
+  private String return_code;
+  private String return_msg;
+  private String appid;
+  private String mch_id;
+  private String nonce_str;
+  private String sign;
+  private String result_code;
+  private String prepay_id;
+  private String trade_type;
+  private String err_code;
+  private String err_code_des;
+  private String code_url;
+
+  public String getReturn_code() {
+    return this.return_code;
+  }
+
+  public void setReturn_code(String return_code) {
+    this.return_code = return_code;
+  }
+
+  public String getReturn_msg() {
+    return this.return_msg;
+  }
+
+  public void setReturn_msg(String return_msg) {
+    this.return_msg = return_msg;
+  }
+
+  public String getAppid() {
+    return this.appid;
+  }
+
+  public void setAppid(String appid) {
+    this.appid = appid;
+  }
+
+  public String getMch_id() {
+    return this.mch_id;
+  }
+
+  public void setMch_id(String mch_id) {
+    this.mch_id = mch_id;
+  }
+
+  public String getNonce_str() {
+    return this.nonce_str;
+  }
+
+  public void setNonce_str(String nonce_str) {
+    this.nonce_str = nonce_str;
+  }
+
+  public String getSign() {
+    return this.sign;
+  }
+
+  public void setSign(String sign) {
+    this.sign = sign;
+  }
+
+  public String getResult_code() {
+    return this.result_code;
+  }
+
+  public void setResult_code(String result_code) {
+    this.result_code = result_code;
+  }
+
+  public String getPrepay_id() {
+    return this.prepay_id;
+  }
+
+  public void setPrepay_id(String prepay_id) {
+    this.prepay_id = prepay_id;
+  }
+
+  public String getTrade_type() {
+    return this.trade_type;
+  }
+
+  public void setTrade_type(String trade_type) {
+    this.trade_type = trade_type;
+  }
+
+  public String getErr_code() {
+    return this.err_code;
+  }
+
+  public void setErr_code(String err_code) {
+    this.err_code = err_code;
+  }
+
+  public String getErr_code_des() {
+    return this.err_code_des;
+  }
+
+  public void setErr_code_des(String err_code_des) {
+    this.err_code_des = err_code_des;
+  }
+
+  public String getCode_url() {
+    return this.code_url;
+  }
+
+  public void setCode_url(String code_url) {
+    this.code_url = code_url;
+  }
+}

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/pay/WxRedpackResult.java

@@ -19,32 +19,32 @@ public class WxRedpackResult implements Serializable {
   private static final long serialVersionUID = -4837415036337132073L;
 
   @XStreamAlias("return_code")
-  String returnCode;
+  private String returnCode;
   @XStreamAlias("return_msg")
-  String returnMsg;
+  private String returnMsg;
   @XStreamAlias("sign")
-  String sign;
+  private String sign;
   @XStreamAlias("result_code")
-  String resultCode;
+  private String resultCode;
   
   @XStreamAlias("err_code")
-  String errCode;
+  private String errCode;
   @XStreamAlias("err_code_des")
-  String errCodeDes;
+  private String errCodeDes;
   @XStreamAlias("mch_billno")
-  String mchBillno;
+  private String mchBillno;
   @XStreamAlias("mch_id")
-  String mchId;
+  private String mchId;
   @XStreamAlias("wxappid")
-  String wxappid;
+  private String wxappid;
   @XStreamAlias("re_openid")
-  String reOpenid;
+  private String reOpenid;
   @XStreamAlias("total_amount")
-  int totalAmount;
+  private int totalAmount;
   @XStreamAlias("send_time")
-  String sendTime;
+  private String sendTime;
   @XStreamAlias("send_listid")
-  String sendListid;
+  private String sendListid;
   
   public String getErrCode() {
     return this.errCode;

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/pay/WxSendRedpackRequest.java

@@ -158,7 +158,7 @@ public class WxSendRedpackRequest {
   private String consumeMchId;
 
   public String getMchBillno() {
-    return mchBillno;
+    return this.mchBillno;
   }
 
   public void setMchBillno(String mchBillno) {
@@ -166,7 +166,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getSendName() {
-    return sendName;
+    return this.sendName;
   }
 
   public void setSendName(String sendName) {
@@ -174,7 +174,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getReOpenid() {
-    return reOpenid;
+    return this.reOpenid;
   }
 
   public void setReOpenid(String reOpenid) {
@@ -182,7 +182,7 @@ public class WxSendRedpackRequest {
   }
 
   public Integer getTotalAmount() {
-    return totalAmount;
+    return this.totalAmount;
   }
 
   public void setTotalAmount(Integer totalAmount) {
@@ -190,7 +190,7 @@ public class WxSendRedpackRequest {
   }
 
   public Integer getTotalNum() {
-    return totalNum;
+    return this.totalNum;
   }
 
   public void setTotalNum(Integer totalNum) {
@@ -198,7 +198,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getAmtType() {
-    return amtType;
+    return this.amtType;
   }
 
   public void setAmtType(String amtType) {
@@ -206,7 +206,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getWishing() {
-    return wishing;
+    return this.wishing;
   }
 
   public void setWishing(String wishing) {
@@ -214,7 +214,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getClientIp() {
-    return clientIp;
+    return this.clientIp;
   }
 
   public void setClientIp(String clientIp) {
@@ -222,7 +222,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getActName() {
-    return actName;
+    return this.actName;
   }
 
   public void setActName(String actName) {
@@ -230,7 +230,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getRemark() {
-    return remark;
+    return this.remark;
   }
 
   public void setRemark(String remark) {
@@ -238,7 +238,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getWxAppid() {
-    return wxAppid;
+    return this.wxAppid;
   }
 
   public void setWxAppid(String wxAppid) {
@@ -246,7 +246,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getMchId() {
-    return mchId;
+    return this.mchId;
   }
 
   public void setMchId(String mchId) {
@@ -254,7 +254,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getNonceStr() {
-    return nonceStr;
+    return this.nonceStr;
   }
 
   public void setNonceStr(String nonceStr) {
@@ -262,7 +262,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getSign() {
-    return sign;
+    return this.sign;
   }
 
   public void setSign(String sign) {
@@ -270,7 +270,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getSceneId() {
-    return sceneId;
+    return this.sceneId;
   }
 
   public void setSceneId(String sceneId) {
@@ -278,7 +278,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getRiskInfo() {
-    return riskInfo;
+    return this.riskInfo;
   }
 
   public void setRiskInfo(String riskInfo) {
@@ -286,7 +286,7 @@ public class WxSendRedpackRequest {
   }
 
   public String getConsumeMchId() {
-    return consumeMchId;
+    return this.consumeMchId;
   }
 
   public void setConsumeMchId(String consumeMchId) {

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/pay/WxUnifiedOrderRequest.java

@@ -1,14 +1,30 @@
 package me.chanjar.weixin.mp.bean.pay;
 
+import org.apache.commons.lang3.builder.ToStringBuilder;
+import org.apache.commons.lang3.builder.ToStringStyle;
+
 import com.thoughtworks.xstream.annotations.XStreamAlias;
 
+import me.chanjar.weixin.common.annotation.Required;
+
 /**
- *  统一下单请求参数对象
+ * <pre>
- *  Created by Binary Wang on 2016/9/25.
+ * 统一下单请求参数对象
+ * 参考文档：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1
+ * 每个字段描述对应如下：
+ * <li>字段名
+ * <li>变量名
+ * <li>是否必填
+ * <li>类型
+ * <li>示例值
+ * <li>描述
+ * </pre>
+ * Created by Binary Wang on 2016/9/25.
  * @author binarywang (https://github.com/binarywang)
  */
 @XStreamAlias("xml")
 public class WxUnifiedOrderRequest {
+
   /**
    * <pre>
    * 公众账号ID
@@ -19,6 +35,9 @@ public class WxUnifiedOrderRequest {
    * 微信分配的公众账号ID（企业号corpid即为此appId）
    * </pre>
    */
+  @XStreamAlias("appid")
+  private String appid;
+
   /**
    * <pre>
    * 商户号
@@ -29,6 +48,9 @@ public class WxUnifiedOrderRequest {
    * 微信支付分配的商户号
    * </pre>
    */
+  @XStreamAlias("mch_id")
+  private String mchId;
+
   /**
    * <pre>
    * 设备号
@@ -36,9 +58,12 @@ public class WxUnifiedOrderRequest {
    * 否
    * String(32)
    * 013467007045764
-   * 终端设备号(门店号或收银设备ID)，注意：PC网页或公众号内支付请传"WEB"
+   * 终端设备号(门店号或收银设备Id)，注意：PC网页或公众号内支付请传"WEB"
    * </pre>
    */
+  @XStreamAlias("device_info")
+  private String deviceInfo;
+
   /**
    * <pre>
    * 随机字符串
@@ -49,16 +74,22 @@ public class WxUnifiedOrderRequest {
    * 随机字符串，不长于32位。推荐随机数生成算法
    * </pre>
    */
+  @XStreamAlias("nonce_str")
+  private String nonceStr;
+
   /**
    * <pre>
    * 签名
    * sign
    * 是
-   *  String(32)  
+   * String(32)
-   *  C380BEC2BFD727A4B6845133519F3AD6  
+   * C380BEC2BFD727A4B6845133519F3AD6
-   *  签名，详见签名生成算法
+   * 签名，详见签名生成算法
    * </pre>
    */
+  @XStreamAlias("sign")
+  private String sign;
+
   /**
    * <pre>
    * 商品描述
@@ -69,6 +100,10 @@ public class WxUnifiedOrderRequest {
    * 商品简单描述，该字段须严格按照规范传递，具体请见参数规定
    * </pre>
    */
+  @Required
+  @XStreamAlias("body")
+  private String body;
+
   /**
    * <pre>
    * 商品详情
@@ -76,37 +111,40 @@ public class WxUnifiedOrderRequest {
    * 否
    * String(6000)
    *  {  "goods_detail":[
-      {
+    {
-      "goods_id":"iphone6s_16G",
+    "goods_id":"iphone6s_16G",
-      "wxpay_goods_id":"1001",
+    "wxpay_goods_id":"1001",
-      "goods_name":"iPhone6s 16G",
+    "goods_name":"iPhone6s 16G",
-      "goods_num":1,
+    "goods_num":1,
-      "price":528800,
+    "price":528800,
-      "goods_category":"123456",
+    "goods_category":"123456",
-      "body":"苹果手机"
+    "body":"苹果手机"
-      },
+    },
-      {
+    {
-      "goods_id":"iphone6s_32G",
+    "goods_id":"iphone6s_32G",
-      "wxpay_goods_id":"1002",
+    "wxpay_goods_id":"1002",
-      "goods_name":"iPhone6s 32G",
+    "goods_name":"iPhone6s 32G",
-      "quantity":1,
+    "quantity":1,
-      "price":608800,
+    "price":608800,
-      "goods_category":"123789",
+    "goods_category":"123789",
-      "body":"苹果手机"
+    "body":"苹果手机"
-      }
+    }
-      ]
+    ]
-      } 
+    }
-              商品详细列表，使用Json格式，传输签名前请务必使用CDATA标签将JSON文本串保护起来。
+            商品详细列表，使用Json格式，传输签名前请务必使用CDATA标签将JSON文本串保护起来。
-        goods_detail []：
+      goods_detail []：
-        └ goods_id String 必填 32 商品的编号
+      └ goods_id String 必填 32 商品的编号
-        └ wxpay_goods_id String 可选 32 微信支付定义的统一商品编号
+      └ wxpay_goods_id String 可选 32 微信支付定义的统一商品编号
-        └ goods_name String 必填 256 商品名称
+      └ goods_name String 必填 256 商品名称
-        └ goods_num Int 必填 商品数量
+      └ goods_num Int 必填 商品数量
-        └ price Int 必填 商品单价，单位为分
+      └ price Int 必填 商品单价，单位为分
-        └ goods_category String 可选 32 商品类目ID
+      └ goods_category String 可选 32 商品类目Id
-        └ body String 可选 1000 商品描述信息
+      └ body String 可选 1000 商品描述信息
    * </pre>
    */
+  @XStreamAlias("detail")
+  private String detail;
+
   /**
    * <pre>
    * 附加数据
@@ -117,6 +155,9 @@ public class WxUnifiedOrderRequest {
    *  附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据
    * </pre>
    */
+  @XStreamAlias("attach")
+  private String attach;
+
   /**
    * <pre>
    * 商户订单号
@@ -127,6 +168,10 @@ public class WxUnifiedOrderRequest {
    * 商户系统内部的订单号,32个字符内、可包含字母, 其他说明见商户订单号
    * </pre>
    */
+  @Required
+  @XStreamAlias("out_trade_no")
+  private String outTradeNo;
+
   /**
    * <pre>
    * 货币类型
@@ -137,6 +182,9 @@ public class WxUnifiedOrderRequest {
    * 符合ISO 4217标准的三位字母代码，默认人民币：CNY，其他值列表详见货币类型
    * </pre>
    */
+  @XStreamAlias("fee_type")
+  private String feeType;
+
   /**
    * <pre>
    * 总金额
@@ -147,6 +195,10 @@ public class WxUnifiedOrderRequest {
    * 订单总金额，单位为分，详见支付金额
    * </pre>
    */
+  @Required
+  @XStreamAlias("total_fee")
+  private Integer totalFee;
+
   /**
    * <pre>
    * 终端IP
@@ -157,41 +209,458 @@ public class WxUnifiedOrderRequest {
    * APP和网页支付提交用户端ip，Native支付填调用微信支付API的机器IP。
    * </pre>
    */
+  @Required
+  @XStreamAlias("spbill_create_ip")
+  private String spbillCreateIp;
+
   /**
-   * <pre>  交易起始时间  time_start  否 String(14)  20091225091010  订单生成时间，格式为yyyyMMddHHmmss，如2009年12月25日9点10分10秒表示为20091225091010。其他详见时间规则
+   * <pre>
+   * 交易起始时间
+   * time_start
+   * 否
+   * String(14)
+   * 20091225091010
+   * 订单生成时间，格式为yyyyMMddHHmmss，如2009年12月25日9点10分10秒表示为20091225091010。其他详见时间规则
    * </pre>
    */
+  @XStreamAlias("time_start")
+  private String timeStart;
+
   /**
-   * <pre>  交易结束时间  time_expire 否 String(14)  20091227091010 
+   * <pre>
-   * </pre>
+   * 交易结束时间
-   */
+   * time_expire
-  /** 
+   * 否
-   * <pre>  订单失效时间，格式为yyyyMMddHHmmss，如2009年12月27日9点10分10秒表示为20091227091010。其他详见时间规则
+   * String(14)
+   * 20091227091010
+   * 订单失效时间，格式为yyyyMMddHHmmss，如2009年12月27日9点10分10秒表示为20091227091010。其他详见时间规则
    *   注意：最短失效时间间隔必须大于5分钟
    * </pre>
    */
+  @XStreamAlias("time_expire")
+  private String timeExpire;
+
   /**
-   * <pre>  商品标记  goods_tag 否 String(32)  WXG 商品标记，代金券或立减优惠功能的参数，说明详见代金券或立减优惠
+   * <pre>
+   * 商品标记
+   * goods_tag
+   * 否
+   * String(32)
+   * WXG
+   * 商品标记，代金券或立减优惠功能的参数，说明详见代金券或立减优惠
    * </pre>
    */
+  @XStreamAlias("goods_tag")
+  private String goodsTag;
+
   /**
-   * <pre>  通知地址  notify_url  是 String(256) http://www.weixin.qq.com/wxpay/pay.php  接收微信支付异步通知回调地址，通知url必须为直接可访问的url，不能携带参数。
+   * <pre>
+   * 通知地址
+   * notify_url
+   * 是
+   * String(256)
+   * http://www.weixin.qq.com/wxpay/pay.php
+   * 接收微信支付异步通知回调地址，通知url必须为直接可访问的url，不能携带参数。
    * </pre>
    */
+  @Required
+  @XStreamAlias("notify_url")
+  private String notifyURL;
+
   /**
-   * <pre>  交易类型  trade_type  是 String(16)  JSAPI 取值如下：JSAPI，NATIVE，APP，详细说明见参数规定
+   * <pre>
+   * 交易类型
+   * trade_type
+   * 是
+   * String(16)
+   * JSAPI
+   * 取值如下：JSAPI，NATIVE，APP，详细说明见参数规定:
+   * JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付，统一下单接口trade_type的传参可参考这里
    * </pre>
    */
+  @Required
+  @XStreamAlias("trade_type")
+  private String tradeType;
+
   /**
-   * <pre>  商品ID  product_id  否 String(32)  12235413214070356458058 trade_type=NATIVE，此参数必传。此id为二维码中包含的商品ID，商户自行定义。
+   * <pre>
+   * 商品Id
+   * product_id
+   * 否
+   * String(32)
+   * 12235413214070356458058
+   * trade_type=NATIVE，此参数必传。此id为二维码中包含的商品Id，商户自行定义。
    * </pre>
    */
+  @XStreamAlias("product_id")
+  private String productId;
+
   /**
-   * <pre>  指定支付方式  limit_pay 否 String(32)  no_credit no_credit--指定不能使用信用卡支付
+   * <pre>
+   * 指定支付方式
+   * limit_pay
+   * 否
+   * String(32)
+   * no_credit no_credit--指定不能使用信用卡支付
    * </pre>
    */
+  @XStreamAlias("limit_pay")
+  private String limitPay;
+
   /**
-   * <pre>  用户标识  openid  否 String(128) oUpF8uMuAJO_M2pxb1Q9zNjWeS6o  trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识。openid如何获取，可参考【获取openid】。企业号请使用【企业号OAuth2.0接口】获取企业号内成员userid，再调用【企业号userid转openid接口】进行转换
+   * <pre>
+   * 用户标识
+   * openid
+   * 否
+   * String(128)
+   * oUpF8uMuAJO_M2pxb1Q9zNjWeS6o
+   * trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识。
+   * openid如何获取，可参考【获取openid】。
+   * 企业号请使用【企业号OAuth2.0接口】获取企业号内成员userid，再调用【企业号userid转openid接口】进行转换
    * </pre>
    */
+  @XStreamAlias("openid")
+  private String openid;
+
+  public String getAppid() {
+    return this.appid;
+  }
+
+  public void setAppid(String appid) {
+    this.appid = appid;
+  }
+
+  public String getMchId() {
+    return this.mchId;
+  }
+
+  public void setMchId(String mchId) {
+    this.mchId = mchId;
+  }
+
+  public String getDeviceInfo() {
+    return this.deviceInfo;
+  }
+
+  public void setDeviceInfo(String deviceInfo) {
+    this.deviceInfo = deviceInfo;
+  }
+
+  public String getNonceStr() {
+    return this.nonceStr;
+  }
+
+  public void setNonceStr(String nonceStr) {
+    this.nonceStr = nonceStr;
+  }
+
+  public String getSign() {
+    return this.sign;
+  }
+
+  public void setSign(String sign) {
+    this.sign = sign;
+  }
+
+  public String getBody() {
+    return this.body;
+  }
+
+  public void setBody(String body) {
+    this.body = body;
+  }
+
+  public String getDetail() {
+    return this.detail;
+  }
+
+  public void setDetail(String detail) {
+    this.detail = detail;
+  }
+
+  public String getAttach() {
+    return this.attach;
+  }
+
+  public void setAttach(String attach) {
+    this.attach = attach;
+  }
+
+  public String getOutTradeNo() {
+    return this.outTradeNo;
+  }
+
+  public void setOutTradeNo(String outTradeNo) {
+    this.outTradeNo = outTradeNo;
+  }
+
+  public String getFeeType() {
+    return this.feeType;
+  }
+
+  public void setFeeType(String feeType) {
+    this.feeType = feeType;
+  }
+
+  public Integer getTotalFee() {
+    return this.totalFee;
+  }
+
+  public void setTotalFee(Integer totalFee) {
+    this.totalFee = totalFee;
+  }
+
+  public String getSpbillCreateIp() {
+    return this.spbillCreateIp;
+  }
+
+  public void setSpbillCreateIp(String spbillCreateIp) {
+    this.spbillCreateIp = spbillCreateIp;
+  }
+
+  public String getTimeStart() {
+    return this.timeStart;
+  }
+
+  public void setTimeStart(String timeStart) {
+    this.timeStart = timeStart;
+  }
+
+  public String getTimeExpire() {
+    return this.timeExpire;
+  }
+
+  public void setTimeExpire(String timeExpire) {
+    this.timeExpire = timeExpire;
+  }
+
+  public String getGoodsTag() {
+    return this.goodsTag;
+  }
+
+  public void setGoodsTag(String goodsTag) {
+    this.goodsTag = goodsTag;
+  }
+
+  public String getNotifyURL() {
+    return this.notifyURL;
+  }
+
+  public void setNotifyURL(String notifyURL) {
+    this.notifyURL = notifyURL;
+  }
+
+  public String getTradeType() {
+    return this.tradeType;
+  }
+
+  public void setTradeType(String tradeType) {
+    this.tradeType = tradeType;
+  }
+
+  public String getProductId() {
+    return this.productId;
+  }
+
+  public void setProductId(String productId) {
+    this.productId = productId;
+  }
+
+  public String getLimitPay() {
+    return this.limitPay;
+  }
+
+  public void setLimitPay(String limitPay) {
+    this.limitPay = limitPay;
+  }
+
+  public String getOpenid() {
+    return this.openid;
+  }
+
+  public void setOpenid(String openid) {
+    this.openid = openid;
+  }
+
+  @Override
+  public String toString() {
+    return ToStringBuilder.reflectionToString(this, ToStringStyle.JSON_STYLE);
+  }
+
+  public static WxUnifiedOrderRequestBuilder builder() {
+    return new WxUnifiedOrderRequestBuilder();
+  }
+
+  public static class WxUnifiedOrderRequestBuilder {
+    private String appid;
+    private String mchId;
+    private String deviceInfo;
+    private String nonceStr;
+    private String sign;
+    private String body;
+    private String detail;
+    private String attach;
+    private String outTradeNo;
+    private String feeType;
+    private Integer totalFee;
+    private String spbillCreateIp;
+    private String timeStart;
+    private String timeExpire;
+    private String goodsTag;
+    private String notifyURL;
+    private String tradeType;
+    private String productId;
+    private String limitPay;
+    private String openid;
+
+    public WxUnifiedOrderRequestBuilder appid(String appid) {
+      this.appid = appid;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder mchId(String mchId) {
+      this.mchId = mchId;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder deviceInfo(String deviceInfo) {
+      this.deviceInfo = deviceInfo;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder nonceStr(String nonceStr) {
+      this.nonceStr = nonceStr;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder sign(String sign) {
+      this.sign = sign;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder body(String body) {
+      this.body = body;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder detail(String detail) {
+      this.detail = detail;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder attach(String attach) {
+      this.attach = attach;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder outTradeNo(String outTradeNo) {
+      this.outTradeNo = outTradeNo;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder feeType(String feeType) {
+      this.feeType = feeType;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder totalFee(Integer totalFee) {
+      this.totalFee = totalFee;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder spbillCreateIp(String spbillCreateIp) {
+      this.spbillCreateIp = spbillCreateIp;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder timeStart(String timeStart) {
+      this.timeStart = timeStart;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder timeExpire(String timeExpire) {
+      this.timeExpire = timeExpire;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder goodsTag(String goodsTag) {
+      this.goodsTag = goodsTag;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder notifyURL(String notifyURL) {
+      this.notifyURL = notifyURL;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder tradeType(String tradeType) {
+      this.tradeType = tradeType;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder productId(String productId) {
+      this.productId = productId;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder limitPay(String limitPay) {
+      this.limitPay = limitPay;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder openid(String openid) {
+      this.openid = openid;
+      return this;
+    }
+
+    public WxUnifiedOrderRequestBuilder from(WxUnifiedOrderRequest origin) {
+      this.appid(origin.appid);
+      this.mchId(origin.mchId);
+      this.deviceInfo(origin.deviceInfo);
+      this.nonceStr(origin.nonceStr);
+      this.sign(origin.sign);
+      this.body(origin.body);
+      this.detail(origin.detail);
+      this.attach(origin.attach);
+      this.outTradeNo(origin.outTradeNo);
+      this.feeType(origin.feeType);
+      this.totalFee(origin.totalFee);
+      this.spbillCreateIp(origin.spbillCreateIp);
+      this.timeStart(origin.timeStart);
+      this.timeExpire(origin.timeExpire);
+      this.goodsTag(origin.goodsTag);
+      this.notifyURL(origin.notifyURL);
+      this.tradeType(origin.tradeType);
+      this.productId(origin.productId);
+      this.limitPay(origin.limitPay);
+      this.openid(origin.openid);
+      return this;
+    }
+
+    public WxUnifiedOrderRequest build() {
+      WxUnifiedOrderRequest m = new WxUnifiedOrderRequest();
+      m.appid = this.appid;
+      m.mchId = this.mchId;
+      m.deviceInfo = this.deviceInfo;
+      m.nonceStr = this.nonceStr;
+      m.sign = this.sign;
+      m.body = this.body;
+      m.detail = this.detail;
+      m.attach = this.attach;
+      m.outTradeNo = this.outTradeNo;
+      m.feeType = this.feeType;
+      m.totalFee = this.totalFee;
+      m.spbillCreateIp = this.spbillCreateIp;
+      m.timeStart = this.timeStart;
+      m.timeExpire = this.timeExpire;
+      m.goodsTag = this.goodsTag;
+      m.notifyURL = this.notifyURL;
+      m.tradeType = this.tradeType;
+      m.productId = this.productId;
+      m.limitPay = this.limitPay;
+      m.openid = this.openid;
+      return m;
+    }
+  }
+
 }

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/pay/WxUnifiedOrderResult.java

@@ -0,0 +1,155 @@
+package me.chanjar.weixin.mp.bean.pay;
+
+import org.apache.commons.lang3.builder.ToStringBuilder;
+import org.apache.commons.lang3.builder.ToStringStyle;
+
+import com.thoughtworks.xstream.annotations.XStreamAlias;
+
+/**
+ * <pre>
+ * 在发起微信支付前，需要调用统一下单接口，获取"预支付交易会话标识"返回的结果
+ * 统一下单(详见http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)
+ * </pre>
+ *
+ * @author chanjarster
+ */
+@XStreamAlias("xml")
+public class WxUnifiedOrderResult {
+
+  @XStreamAlias("return_code")
+  private String returnCode;
+
+  @XStreamAlias("return_msg")
+  private String returnMsg;
+
+  @XStreamAlias("appid")
+  private String appid;
+
+  @XStreamAlias("mch_id")
+  private String mchId;
+
+  @XStreamAlias("nonce_str")
+  private String nonceStr;
+
+  @XStreamAlias("sign")
+  private String sign;
+
+  @XStreamAlias("result_code")
+  private String resultCode;
+
+  @XStreamAlias("prepay_id")
+  private String prepayId;
+
+  @XStreamAlias("trade_type")
+  private String tradeType;
+
+  @XStreamAlias("err_code")
+  private String errCode;
+
+  @XStreamAlias("err_code_des")
+  private String errCodeDes;
+
+  @XStreamAlias("code_url")
+  private String codeURL;
+
+  public String getReturnCode() {
+    return this.returnCode;
+  }
+
+  public void setReturnCode(String returnCode) {
+    this.returnCode = returnCode;
+  }
+
+  public String getReturnMsg() {
+    return this.returnMsg;
+  }
+
+  public void setReturnMsg(String returnMsg) {
+    this.returnMsg = returnMsg;
+  }
+
+  public String getAppid() {
+    return this.appid;
+  }
+
+  public void setAppid(String appid) {
+    this.appid = appid;
+  }
+
+  public String getMchId() {
+    return this.mchId;
+  }
+
+  public void setMchId(String mchId) {
+    this.mchId = mchId;
+  }
+
+  public String getNonceStr() {
+    return this.nonceStr;
+  }
+
+  public void setNonceStr(String nonceStr) {
+    this.nonceStr = nonceStr;
+  }
+
+  public String getSign() {
+    return this.sign;
+  }
+
+  public void setSign(String sign) {
+    this.sign = sign;
+  }
+
+  public String getResultCode() {
+    return this.resultCode;
+  }
+
+  public void setResultCode(String resultCode) {
+    this.resultCode = resultCode;
+  }
+
+  public String getPrepayId() {
+    return this.prepayId;
+  }
+
+  public void setPrepayId(String prepayId) {
+    this.prepayId = prepayId;
+  }
+
+  public String getTradeType() {
+    return this.tradeType;
+  }
+
+  public void setTradeType(String tradeType) {
+    this.tradeType = tradeType;
+  }
+
+  public String getErrCode() {
+    return this.errCode;
+  }
+
+  public void setErrCode(String errCode) {
+    this.errCode = errCode;
+  }
+
+  public String getErrCodeDes() {
+    return this.errCodeDes;
+  }
+
+  public void setErrCodeDes(String errCodeDes) {
+    this.errCodeDes = errCodeDes;
+  }
+
+  public String getCodeURL() {
+    return this.codeURL;
+  }
+
+  public void setCodeURL(String codeURL) {
+    this.codeURL = codeURL;
+  }
+
+  @Override
+  public String toString() {
+    return ToStringBuilder.reflectionToString(this, ToStringStyle.JSON_STYLE);
+  }
+}

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/result/WxMpPrepayIdResult.java

@@ -1,128 +0,0 @@
-package me.chanjar.weixin.mp.bean.result;
-
-import java.io.Serializable;
-
-/**
- * <pre>
- * 在发起微信支付前，需要调用统一下单接口，获取"预支付交易会话标识"返回的结果
- *
- * 统一下单(详见http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)
- *
- * </pre>
- *
- * @author chanjarster
- */
-public class WxMpPrepayIdResult implements Serializable {
-    /**
-   * 
-   */
-  private static final long serialVersionUID = -8970574397788396143L;
-    private String return_code;
-    private String return_msg;
-    private String appid;
-    private String mch_id;
-    private String nonce_str;
-    private String sign;
-    private String result_code;
-    private String prepay_id;
-    private String trade_type;
-    private String err_code;
-    private String err_code_des;
-    private String code_url;
-
-    public String getReturn_code() {
-        return this.return_code;
-    }
-
-    public void setReturn_code(String return_code) {
-        this.return_code = return_code;
-    }
-
-    public String getReturn_msg() {
-        return this.return_msg;
-    }
-
-    public void setReturn_msg(String return_msg) {
-        this.return_msg = return_msg;
-    }
-
-    public String getAppid() {
-        return this.appid;
-    }
-
-    public void setAppid(String appid) {
-        this.appid = appid;
-    }
-
-    public String getMch_id() {
-        return this.mch_id;
-    }
-
-    public void setMch_id(String mch_id) {
-        this.mch_id = mch_id;
-    }
-
-    public String getNonce_str() {
-        return this.nonce_str;
-    }
-
-    public void setNonce_str(String nonce_str) {
-        this.nonce_str = nonce_str;
-    }
-
-    public String getSign() {
-        return this.sign;
-    }
-
-    public void setSign(String sign) {
-        this.sign = sign;
-    }
-
-    public String getResult_code() {
-        return this.result_code;
-    }
-
-    public void setResult_code(String result_code) {
-        this.result_code = result_code;
-    }
-
-    public String getPrepay_id() {
-        return this.prepay_id;
-    }
-
-    public void setPrepay_id(String prepay_id) {
-        this.prepay_id = prepay_id;
-    }
-
-    public String getTrade_type() {
-        return this.trade_type;
-    }
-
-    public void setTrade_type(String trade_type) {
-        this.trade_type = trade_type;
-    }
-    
-    public String getErr_code() {
-      return this.err_code;
-    }
-
-    public void setErr_code(String err_code) {
-      this.err_code = err_code;
-    }
-
-    public String getErr_code_des() {
-      return this.err_code_des;
-    }
-
-    public void setErr_code_des(String err_code_des) {
-      this.err_code_des = err_code_des;
-    }
-
-    public String getCode_url() {
-      return this.code_url;
-    }
-
-    public void setCode_url(String code_url) {
-      this.code_url = code_url;
-    }
-}

weixin-java-mp/src/test/java/me/chanjar/weixin/mp/api/impl/WxMpPayServiceImplTest.java

@@ -5,9 +5,12 @@ import org.testng.annotations.Test;
 
 import com.google.inject.Inject;
 
+import me.chanjar.weixin.common.exception.WxErrorException;
 import me.chanjar.weixin.mp.api.ApiTestModule;
 import me.chanjar.weixin.mp.bean.pay.WxRedpackResult;
 import me.chanjar.weixin.mp.bean.pay.WxSendRedpackRequest;
+import me.chanjar.weixin.mp.bean.pay.WxUnifiedOrderRequest;
+import me.chanjar.weixin.mp.bean.pay.WxUnifiedOrderResult;
 
 /**
  * 测试支付相关接口
@@ -26,11 +29,6 @@ public class WxMpPayServiceImplTest {
 
   }
 
-  @Test
-  public void testGetPrepayId1() throws Exception {
-
-  }
-
   @Test
   public void testGetJsapiPayInfo() throws Exception {
 
@@ -78,4 +76,16 @@ public class WxMpPayServiceImplTest {
     System.err.println(redpackResult);
   }
 
+  /**
+   * Test method for {@link me.chanjar.weixin.mp.api.impl.WxMpPayServiceImpl#unifiedOrder(me.chanjar.weixin.mp.bean.pay.WxUnifiedOrderRequest)}.
+   * @throws WxErrorException 
+   */
+  @Test
+  public void testUnifiedOrder() throws WxErrorException {
+    WxUnifiedOrderResult result = this.wxService.getPayService()
+        .unifiedOrder(WxUnifiedOrderRequest.builder().body("1111111")
+            .totalFee(1).spbillCreateIp("111111").notifyURL("111111")
+            .tradeType("JSAPI1").openid("122").outTradeNo("111111").build());
+    System.err.println(result);
+  }
 }