issue #101 获取微信服务器IP地址

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

@@ -421,6 +421,16 @@ public interface WxMpService {
    */
   public boolean oauth2validateAccessToken(WxMpOAuth2AccessToken oAuth2AccessToken);
 
+  /**
+   * <pre>
+   * 获取微信服务器IP地址
+   * http://mp.weixin.qq.com/wiki/0/2ad4b6bfd29f30f71d39616c2a0fcedc.html
+   * </pre>
+   * @return
+   * @throws WxErrorException
+   */
+  String[] getCallbackIP() throws WxErrorException;
+
   /**
    * 当本Service没有实现某个API的时候，可以用这个，针对所有微信API中的GET请求
    * @param url

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

@@ -1,5 +1,6 @@
 package me.chanjar.weixin.mp.api;
 
+import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.internal.Streams;
@@ -451,6 +452,19 @@ public class WxMpServiceImpl implements WxMpService {
     return true;
   }
 
+  @Override
+  public String[] getCallbackIP() throws WxErrorException {
+    String url = "https://api.weixin.qq.com/cgi-bin/getcallbackip";
+    String responseContent = get(url, null);
+    JsonElement tmpJsonElement = Streams.parse(new JsonReader(new StringReader(responseContent)));
+    JsonArray ipList = tmpJsonElement.getAsJsonObject().get("ip_list").getAsJsonArray();
+    String[] ipArray = new String[ipList.size()];
+    for (int i = 0; i < ipList.size(); i++) {
+      ipArray[i] = ipList.get(i).getAsString();
+    }
+    return ipArray;
+  }
+
   public String get(String url, String queryParam) throws WxErrorException {
     return execute(new SimpleGetRequestExecutor(), url, queryParam);
   }