Http发送Json

     public static JSONObject post(String url,JSONObject json){
             HttpClient client = new DefaultHttpClient();
             HttpPost post = new HttpPost(url);
             JSONObject response = null;
             try {
                 StringEntity s = new StringEntity(json.toString(),"UTF-8");  //服务器返回中文乱码，加上"UTF-8"可以了
                 s.setContentEncoding("UTF-8");
                 s.setContentType("application/json");
                 post.setEntity(s);  

                 HttpResponse res = client.execute(post);
                 if(res.getStatusLine().getStatusCode() == HttpStatus.OK.value()){
                     HttpEntity entity = res.getEntity();
                     String charset = EntityUtils.getContentCharSet(entity);
                     response = new JSONObject(new JSONTokener(new InputStreamReader(entity.getContent(),charset)));
                 }
             } catch (Exception e) {
                 throw new RuntimeException(e);
             }
             return response;
         }  

http://201202104504.iteye.com/blog/1413714