httpClient与openfeign

目录

介绍

maven坐标

发送请求步骤

发送get请求

​发送post请求 

介绍

是一个客户端编程的工具包，也就是在java程序中，可以构造http请求并且发送请求

maven坐标

httpclient

<dependency>

        <groupId>org.apache.httpcomponents</groupId>

        <artifactId>httpclient</artifactId>

</dependency>

fastjson 

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId>
</dependency>

发送请求步骤

创建HttpClient对象

创建 Http请求对象

创建 HttpClient的execute方法发送请求

发送get请求

/*** 使用httpclient发送get请求*/
@Test
public void testGet() throws IOException {//创建httpclient对象CloseableHttpClient httpClient = HttpClients.createDefault();//创建请求对象HttpGet httpGet = new HttpGet("http://localhost:8080/user/shop/status");//发送请求，接收响应结果CloseableHttpResponse response = httpClient.execute(httpGet);//获取服务端返回的状态码int statusCode = response.getStatusLine().getStatusCode();System.out.println("服务端返回的状态码"+statusCode);HttpEntity entity = response.getEntity();String body = EntityUtils.toString(entity);System.out.println("服务端返回的数据为："+body);//关闭资源response.close();httpClient.close();}

发送post请求 

/*** 使用httpclient发送post请求*/
@Test
public void testPOST() throws IOException {CloseableHttpClient httpClient = HttpClients.createDefault();HttpPost httpPost = new HttpPost("http://localhost:8080/admin/employee/login");//使用fastjson组装数据JSONObject jsonObject = new JSONObject();jsonObject.put("username", "admin");jsonObject.put("password", "123456");//提交请求体StringEntity entity = new StringEntity(jsonObject.toString());entity.setContentType("application/json");entity.setContentEncoding("UTF-8");httpPost.setEntity(entity);//发送请求CloseableHttpResponse response = httpClient.execute(httpPost);int statusCode = response.getStatusLine().getStatusCode();System.out.println("服务端返回的状态码"+statusCode);HttpEntity entity1 = response.getEntity();String body = EntityUtils.toString(entity1);System.out.println("服务端返回的数据为："+body);//关闭资源response.close();httpClient.close();}