Fix the bug that fails to query order due to sign error.

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

@@ -897,19 +897,20 @@ public class WxMpServiceImpl implements WxMpService {
     SortedMap<String, String> packageParams = new TreeMap<String, String>();
     packageParams.put("appid", wxMpConfigStorage.getAppId());
     packageParams.put("mch_id", wxMpConfigStorage.getPartnerId());
+    if (transactionId != null && !"".equals(transactionId.trim()))
       packageParams.put("transaction_id", transactionId);
+    else if (outTradeNo != null && !"".equals(outTradeNo.trim()))
       packageParams.put("out_trade_no", outTradeNo);
+    else
+      throw new IllegalArgumentException("Either 'transactionId' or 'outTradeNo' must be given.");
     packageParams.put("nonce_str", nonce_str);
+    packageParams.put("sign", WxCryptUtil.createSign(packageParams, wxMpConfigStorage.getPartnerKey()));
 
-      String sign = WxCryptUtil.createSign(packageParams, wxMpConfigStorage.getPartnerKey());
-      String xml = "<xml>" +
-              "<appid>" + wxMpConfigStorage.getAppId() + "</appid>" +
-              "<mch_id>" + wxMpConfigStorage.getPartnerId() + "</mch_id>" +
-              "<transaction_id>" + transactionId + "</transaction_id>" +
-              "<out_trade_no>" + outTradeNo + "</out_trade_no>" +
-              "<nonce_str>" + nonce_str + "</nonce_str>" +
-              "<sign>" + sign + "</sign>" +
-              "</xml>";
+    StringBuilder request = new StringBuilder("<xml>");
+    for (Entry<String, String> para : packageParams.entrySet()) {
+      request.append(String.format("<%s>%s</%s>", para.getKey(), para.getValue(), para.getKey()));
+    }
+    request.append("</xml>");
 
     HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/pay/orderquery");
     if (httpProxy != null) {
@@ -917,7 +918,7 @@ public class WxMpServiceImpl implements WxMpService {
       httpPost.setConfig(config);
     }
 
-      StringEntity entity = new StringEntity(xml, Consts.UTF_8);
+    StringEntity entity = new StringEntity(request.toString(), Consts.UTF_8);
     httpPost.setEntity(entity);
     try {
       CloseableHttpResponse response = httpClient.execute(httpPost);
@@ -927,9 +928,8 @@ public class WxMpServiceImpl implements WxMpService {
       WxMpPayResult wxMpPayResult = (WxMpPayResult) xstream.fromXML(responseContent);
       return wxMpPayResult;
     } catch (IOException e) {
-        e.printStackTrace();
+      throw new RuntimeException("Failed to query order due to IO exception.", e);
     }
-      return new WxMpPayResult();
   }
 
   @Override

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

@@ -13,6 +13,11 @@ import java.io.Serializable;
  * @author ukid
  */
 public class WxMpPayResult implements Serializable {
+  /**
+   * 
+   */
+  private static final long serialVersionUID = -570934170727777190L;
+  
   private String return_code;
   private String return_msg;
   private String appid;
@@ -23,6 +28,7 @@ public class WxMpPayResult implements Serializable {
   private String err_code;
   private String err_code_des;
   private String trade_state;
+  private String trade_state_desc;
   private String device_info;
   private String openid;
   private String is_subscribe;
@@ -212,4 +218,40 @@ public class WxMpPayResult implements Serializable {
     this.time_end = time_end;
   }
 
+  public String getTrade_state_desc() {
+    return trade_state_desc;
+  }
+
+  public void setTrade_state_desc(String trade_state_desc) {
+    this.trade_state_desc = trade_state_desc;
+  }
+
+  @Override
+  public String toString() {
+    return "WxMpPayResult{" +
+        "return_code=" + return_code +
+        ", return_msg='" + return_msg + '\'' +
+        ", appid='" + appid + '\'' +
+        ", mch_id='" + mch_id + '\'' +
+        ", nonce_str='" + nonce_str + '\'' +
+        ", sign='" + sign + '\'' +
+        ", result_code='" + result_code + '\'' +
+        ", err_code='" + err_code + '\'' +
+        ", err_code_des='" + err_code_des + '\'' +
+        ", trade_state=" + trade_state +
+        ", trade_state_desc=" + trade_state_desc +
+        ", device_info='" + device_info + '\'' +
+        ", openid='" + openid + '\'' +
+        ", is_subscribe='" + is_subscribe + '\'' +
+        ", trade_type='" + trade_type + '\'' +
+        ", bank_type='" + bank_type + '\'' +
+        ", total_fee='" + total_fee + '\'' +
+        ", coupon_fee='" + coupon_fee + '\'' +
+        ", fee_type='" + fee_type + '\'' +
+        ", transaction_id='" + transaction_id + '\'' +
+        ", out_trade_no='" + out_trade_no + '\'' +
+        ", attach='" + attach + '\'' +
+        ", time_end='" + time_end + '\'' +
+        '}';
+  }
 }