public static String sendPost(String url,String params) {
//访问网络，url：地址  params：json信息即传入服务器信息，返回值result即ResponseInfo1 的xml
   OutputStreamWriter  out = null;
   BufferedReader in = null;
   String result = "";
   try {
      HttpURLConnection conn = getHttpConn(url);
      conn.setConnectTimeout(6000);
      conn.setReadTimeout(5000);
      conn.setRequestProperty("connection","Keep-Alive");
      conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible;MSIE 6.0;Windows NT 5.1; SV1)");
      conn.setRequestProperty("Content-Type","application/json");
      conn.setRequestMethod("POST");
      conn.setDoOutput(true);
      conn.setDoInput(true);
      conn.setUseCaches(false);
      out = new OutputStreamWriter(conn.getOutputStream());
      out.write(params);
      out.flush();
      respCode = conn.getResponseCode();
      Log.i(TAG,"conn.getResponseCode() ="+ respCode);
      in = new BufferedReader(
            new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
         result += "\n" + line;
      }
   } catch (Exception e) {
      result = "发送POST请求出现异常!" + e.toString();
      e.printStackTrace();
      Log.i(TAG,"e.printStackTrace ="+result);
   } finally {
      try {
         if (out != null) {
            out.close();
         }
         if (in != null) {
            in.close();
         }
      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
   Log.i(TAG,"result ="+result);
   return result;
}

//ResponseInfo1来源以上的sendPost函数

String ResponseInfo1 = <?xml version="1.0" encoding="UTF-8" standalone="yes"?><ats><code>99</code><message>版本不一致</message></ats>

String ResponseInfo2  = ParseXML(ResponseInfo1,"<message>","</message>");  // = 版本不一致
public static String ParseXML(String src,String key1,String key2){
   if(src == null || key1 == null || key2 == null) {
      return null;
   }
   
   String result = "";
   int begin = src.indexOf(key1);
   if(begin != -1) {
      result = src.substring(begin +key1.length());
   }
   int end = result.indexOf(key2);
   if(end != -1) {
      result = result.substring(0,end);
   }
   
   return result;
}
打印 
ResponseInfo2  版本不一致