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.    }