HttpServletRequest get JSON POST data

Question

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

User · Answer

Are you posting from a different source (so different port, or hostname)? If so, this very very recent topic I just answered might be helpful.

Odd jQuery problem - Ajax request to a C program not quite working

The problem was the XHR Cross Domain Policy, and a useful tip on how to get around it by using a technique called JSONP. The big downside is that JSONP does not support POST requests.

I know in the original post there is no mention of JavaScript, however JSON is usually used for JavaScript so that's why I jumped to that conclusion

User · Answer

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      report an error        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

[java] HttpServletRequest get JSON POST data

Examples related to java

Examples related to json

Examples related to post

Examples related to servlets