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

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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();
}