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依赖：
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>阿里云OSS包含此依赖：
<dependency>
<groupId>com.aliyun.oss</groupId>
<artifactId>aliyun-sdk-oss</artifactId>
</dependency>| 核心API： |
|---|
| HttpClient |
| HttpClients |
| CloseableHttpClient |
| HttpGet |
| HttpPost |
发送请求步骤：
- 创建HttpClient对象
- 调用Http请求对象
- 调用HttpClient的execute方法发送请求
@SpringBootTest
public class HttpClientTest {
/**
* 测试通过httpclient发送GET方式的请求
*/
@Test
public void testGET() throws Exception{
//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);
//获取服务器端返回的状态
int statusCode = response.getStatusLine().getStatusCode();
System.out.println("服务端返回的状态码为：" + 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();
}
/**
* 测试通过httpclient发送POST方式的请求
*/
@Test
public void testPOST() throws Exception{
//创建httpclient对象
CloseableHttpClient httpClient = HttpClients.createDefault();
//创建请求对象
HttpPost httpPost = new HttpPost("http://localhost:8080/admin/employee/login");
JSONObject jsonObject = new JSONObject();
jsonObject.put("username", "admin");
jsonObject.put("password", "123456");
StringEntity entity = new StringEntity(jsonObject.toString());
//指定请求编码方式
entity.setContentEncoding("UTF-8");
//数据格式
entity.setContentType("application/json");
httpPost.setEntity(entity);
//发送请求
CloseableHttpResponse response = httpClient.execute(httpPost);
//解析返回结果
int statusCode = response.getStatusLine().getStatusCode();
System.out.println("响应码为：" + statusCode);
HttpEntity entity1 = response.getEntity();
String body = EntityUtils.toString(entity1);
System.out.println("响应数据" + body);
//关闭资源
response.close();
httpClient.close();
}
}