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