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();

}