1.创建请求对象:post或者get

 HttpPost httpPost = new HttpPost(url);

2. 创建httpclient对象

CloseableHttpClient httpclient = HttpClientBuilder.create().build();

3. 创建请求头对象

BasicResponseHandler handler = new BasicResponseHandler();

4. 设置请求格式

 StringEntity entity = new StringEntity(jsonData, "utf-8");//解决中文乱码问题
            entity.setContentEncoding("UTF-8");
            entity.setContentType("application/json");
            httpPost.setEntity(entity);

5.执行post请求

 result = httpClient.execute(httpPost, handler);

6.释放连接

 httpClient.close();

demon

  public static String httpClientPost(String url,String jsonData) {
        String result = "";
        //创建post方式请求对象
        HttpPost httpPost = new HttpPost(url);
        //创建httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try {
            BasicResponseHandler handler = new BasicResponseHandler();
            //设置请求格式
            StringEntity entity = new StringEntity(jsonData, "utf-8");//解决中文乱码问题
            entity.setContentEncoding("UTF-8");
            entity.setContentType("application/json");
            httpPost.setEntity(entity);
            //执行POST请求
            result = httpClient.execute(httpPost, handler);
            return result;
        } catch (Exception e) {

        } finally {
            //释放连接
            try {
                httpClient.close();
            } catch (Exception e) {

            }
        }
        return result;
    }