依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

启动类

@SpringBootApplication
@EnableFeignClients
public class OpenFeignApplication {
	public static void main(String[] args) {
		SpringApplication.run(OpenFeignApplication.class, args);
	}
}

发送请求

解析：

• name="HttpBin"：name 可以是任意的客户端名称，用于创建 Spring Cloud LoadBalaner 客户端。如果使用注册中心，则通过该名称去查找服务物理地址。
• url="httpbin.org"：可以是 url 的绝对路径或主机名。
• qulifiers：Spring Bean 别名
• @RequestParam：如果不给参数添加注解，默认是 @RequestBody

@FeignClient(name = "httpBin", url = "httpbin.org")
public interface HttpBinClient {
    @GetMapping("/get")
    Result<StudentDTO> get(@RequestParam String name, @RequestParam Integer age);

    @PostMapping("/post")
    Result post(StudentDTO studentDTO);
}

@Data
public class Result<T> {
    private T args;
    private String data;
}

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class StudentDTO {
    private String name;
    private Integer age;
}

测试：

@SpringBootTest
public class HttpBinClientTest {
    @Autowired
    private HttpBinClient httpBinClient;

    @Test
    public void testGet() {
        StudentDTO jerry = StudentDTO.builder()
                .name("Jerry")
                .age(18)
                .build();
        Result<StudentDTO> result = httpBinClient.get("Jerry", 18);
        Assertions.assertEquals(jerry.getName(), result.getArgs().getName());
        Assertions.assertEquals(jerry.getAge(), result.getArgs().getAge());
    }

    @Test
    public void testPost() throws JsonProcessingException {
        StudentDTO jerry = StudentDTO.builder()
                .name("Jerry")
                .age(18)
                .build();
        Result result = httpBinClient.post(jerry);
        StudentDTO studentDTO = new ObjectMapper().readValue(result.getData(), StudentDTO.class);
        Assertions.assertEquals(jerry.getName(), studentDTO.getName());
        Assertions.assertEquals(jerry.getAge(), studentDTO.getAge());
    }

}

// todo

参阅

• 官方文档