简单的使用httpclient调接口发送和接收JSon

由于项目需要，需要用httpclient调其他部门的接口获取信息，学习了httpclient的使用方法，demo大概代码如下：

 public static List<Object> doPost(String url, JSONObject json, String infoname, Class cl){ 
 
        CloseableHttpClient httpclient = HttpClientBuilder.create().build(); 
        HttpPost post = new HttpPost(url); 
        JSONObject response = null; 
        List<Object> list=new ArrayList(); 
        try { 
            StringEntity s = new StringEntity(json.toString()); 
            s.setContentEncoding("UTF-8"); 
            s.setContentType("application/json");//发送json数据需要设置contentType 
            post.setEntity(s); 
            HttpResponse res = httpclient.execute(post); 
            if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
                String result = EntityUtils.toString(res.getEntity());// 返回json格式： 
                System.out.println(result); 
                response = JSONObject.parseObject(result); 
                List<JSONObject> info = (List) response.get(infoname); 
 
                for (JSONObject s1 : info) { 
                    Object netDownData = (Object) JSONObject.toJavaObject(s1, cl); 
                    list.add(netDownData); 
 
                } 
 
            }else{ 
                    logger.error("拉取失败,错误编码为："+res.getStatusLine().getStatusCode()); 
                } 
        } catch (Exception e) { 
            throw new RuntimeException(e); 
        } 
        return list; 
    }