issue #81 增加获取微信服务器的ip段接口

Author: chanjarster

weixin-java-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpService.java

@@ -327,6 +327,16 @@ public WxMediaUploadResult mediaUpload(String mediaType, String fileType, InputS
    */
   public int invite(String userId, String inviteTips) throws WxErrorException;
 
+  /**
+   * <pre>
+   * 获取微信服务器的ip段
+   * http://qydev.weixin.qq.com/wiki/index.php?title=回调模式#.E8.8E.B7.E5.8F.96.E5.BE.AE.E4.BF.A1.E6.9C.8D.E5.8A.A1.E5.99.A8.E7.9A.84ip.E6.AE.B5
+   * </pre>
+   * @return { "ip_list": ["101.226.103.*", "101.226.62.*"] }
+   * @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-cp/src/main/java/me/chanjar/weixin/cp/api/WxCpServiceImpl.java

@@ -370,6 +370,19 @@ public int invite(String userId, String inviteTips) throws WxErrorException {
     return tmpJsonElement.getAsJsonObject().get("type").getAsInt();
   }
 
+  @Override
+  public String[] getCallbackIp() throws WxErrorException {
+    String url = "https://qyapi.weixin.qq.com/cgi-bin/getcallbackip";
+    String responseContent = get(url, null);
+    JsonElement tmpJsonElement = Streams.parse(new JsonReader(new StringReader(responseContent)));
+    JsonArray jsonArray = tmpJsonElement.getAsJsonObject().get("ip_list").getAsJsonArray();
+    String[] ips = new String[jsonArray.size()];
+    for(int i = 0; i < jsonArray.size(); i++) {
+      ips[i] = jsonArray.get(i).getAsString();
+    }
+    return ips;
+  }
+
   public String get(String url, String queryParam) throws WxErrorException {
     return execute(new SimpleGetRequestExecutor(), url, queryParam);
   }