httpclient之发送字符串

public String HttpPostWithJson(String url, String json) {
        String returnValue = "这是默认返回值，接口调用失败";
        CloseableHttpClient httpClient = HttpClients.createDefault();
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        try{
            //第一步：创建HttpClient对象
         httpClient = HttpClients.createDefault();
             
             //第二步：创建httpPost对象
            HttpPost httpPost = new HttpPost(url);
            
            //第三步：给httpPost设置JSON格式的参数
            StringEntity requestEntity = new StringEntity(json,"utf-8");
            requestEntity.setContentEncoding("UTF-8");                
            httpPost.setHeader("Content-type", "application/json");
            httpPost.setEntity(requestEntity);
           
           //第四步：发送HttpPost请求，获取返回值
           returnValue = httpClient.execute(httpPost,responseHandler); //调接口获取返回值时，必须用此方法
//           CloseableHttpResponse httpResonse = httpClient.execute(httpPost);
//           int statusCode = httpResonse.getStatusLine().getStatusCode();
//           if(statusCode!=200)
//           {
//                System.out.println("请求发送失败，失败的返回参数为："+httpResonse.getStatusLine());
//                returnValue = httpResonse.getStatusLine().toString();      
//           }
//           
          
        }
         catch(Exception e)
        {
             e.printStackTrace();
        }
        
        finally {
           try {
            httpClient.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        }
         //第五步：处理返回值
         return returnValue;
    }