httpclient post如何发送json到服务器，httpclientjson

JSONObject jsonParam = new JSONObject();  
jsonParam.put("chnl_id", "11");
jsonParam.put("title", bean.getTitle());
StringEntity entity = new StringEntity(jsonParam.toString(),"utf-8");
entity.setContentEncoding("UTF-8");    
entity.setContentType("application/json");    
HttpPost method = new HttpPost(url);  
method.setEntity(entity);    
HttpResponse result = httpClient.execute(method);