HttpServletRequest获取JSON POST数据(HttpServletRequest get JSON POST data)

雨点打透心脏的1/2处 2023-09-24 09:29 117阅读 0赞

　　Possible Duplicate:

　　Retrieving JSON Object Literal from HttpServletRequest

　　I am HTTP POST-ing to URL http://laptop:8080/apollo/services/rpc?cmd=execute

　　with

　　POST data

　　{ “jsondata” : “data” }

　　Http request has Content-Type of application/json; charset=UTF-8

　　How do I get the POST data (jsondata) from HttpServletRequest?

　　If I enumerate the request params, I can only see one param,

　　which is “cmd”, not the POST data.

　　盾畳圭宛

　　Normaly you can GET and POST parameters in a servlet the same way:

　　request.getParameter(“cmd”);

　　But only if the POST data is encoded as key-value pairs of content type: “application/x-www-form-urlencoded” like when you use a standard HTML form.

　　If you use a different encoding schema for your post data, as in your case when you post a json data stream, you need to use a custom decoder that can process the raw datastream from:

　　BufferedReader reader=request.getReader();

　　Json post processing example (uses org.json package )

　　public void doPost(HttpServletRequest request, HttpServletResponse response)

　　throws ServletException, IOException {

　　StringBuffer jb=new StringBuffer();

　　String line=null;

　　try {

　　BufferedReader reader=request.getReader();

　　while ((line=reader.readLine()) !=null)

　　jb.append(line);

　　} catch (Exception e) { }

　　try {

　　JSONObject jsonObject=HTTP.toJSONObject(jb.toString());

　　} catch (JSONException e) {

　　// crash and burn

　　throw new IOException(“Error parsing JSON request string”);

　　}

　　// Work with the data using methods like…

　　// int someInt=jsonObject.getInt(“intParamName”);

　　// String someString=jsonObject.getString(“stringParamName”);

　　// JSONObject nestedObj=jsonObject.getJSONObject(“nestedObjName”);

　　// JSONArray arr=jsonObject.getJSONArray(“arrayParamName”);

　　// etc…

　　}

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