java 后台实现ajax post跨域请求传递json格式数据获取json数据问题

参考大神：http://blog.csdn.net/chunqiuwei/article/details/19924821

java后台：

public String ajaxProxy(Integer param1,String param2,String url, HttpServletRequest req){
        JSONObject node = new JSONObject();
 try {
    node.put("param1", param1) ;
     node.put("param2", param2);
    } catch (JSONException e1) {
        e1.printStackTrace();
    }        

    // 使用POST方式向目的服务器发送请求
    URL connect;
    StringBuffer data = new StringBuffer();
    try {
        connect = new URL(url);
        HttpURLConnection connection = (HttpURLConnection)connect.openConnection();
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setRequestProperty("Content-Type", "application/json");

        OutputStreamWriter paramout = new OutputStreamWriter(
                connection.getOutputStream(),"UTF-8");
        paramout.write(node.toString());
        paramout.flush();  

        BufferedReader reader = new BufferedReader(new InputStreamReader(
                connection.getInputStream(), "UTF-8"));
        String line;
        while ((line = reader.readLine()) != null) {
            data.append(line);
        }
        paramout.close();
        reader.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return data.toString();
    }

前台jsp：

$.post(
                url,
                {
                    param1:param1,
                    param2:param2,
                    url:url
                },
                function (data){
                    alert(data);
                }
            );