HttpPost发送Json

1.public static JSONObject post(String url,JSONObject json){  
2.        HttpClient client = new DefaultHttpClient();  
3.        HttpPost post = new HttpPost(url);  
4.        JSONObject response = null;  
5.        try {  
6.            StringEntity s = new StringEntity(json.toString());  
7.            s.setContentEncoding("UTF-8");  
8.            s.setContentType("application/json");  
9.            post.setEntity(s);  
10.              
11.            HttpResponse res = client.execute(post);  
12.            if(res.getStatusLine().getStatusCode() == HttpStatus.OK.value()){  
13.                HttpEntity entity = res.getEntity();  
14.                String charset = EntityUtils.getContentCharSet(entity);  
15.                response = new JSONObject(new JSONTokener(new InputStreamReader(entity.getContent(),charset)));  
16.            }  
17.        } catch (Exception e) {  
18.            throw new RuntimeException(e);  
19.        }  
20.        return response;  
21.    }