SpringCloud学习--OpenFeign使用

						
			       
			            io.github.openfeign
			            feign-httpclient
			       
			     
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        

OpenFeign组成：Feign+Ribbon+Hystrix

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class OpenfeignApplication {

    public static void main(String[] args) {
        SpringApplication.run(OpenfeignApplication.class, args);
    }

}

创建一个接口类

@RestController
@RequestMapping("/test")
public interface TestApi {

    @GetMapping("/hello")
    public String sayHi();

    @GetMapping("/testMap")
    public Map getMap(@RequestParam("key") String key);

    @PostMapping("/testObj")
    public Person getPerson(@RequestBody Person person);
}

   
            com.xjq.study
            common-api
            0.0.1-SNAPSHOT
        

服务提供方实现接口类 ：

 */
@Component
public class TestController implements TestApi{

    @Override
    public String sayHi() {
        return "Hello~";
    }

    @Override
    public Map getMap(String key) {
        System.out.println(key);
        return Collections.singletonMap(key, "values");
    }

    @Override
    public Person getPerson(Person person) {
        return person;
    }
}

服务调用方继承接口

@FeignClient(value = "providers")  // value为服务提供方的服务组
public interface TestInterfaces extends TestApi{
}

服务调用方Controller：

@RestController
public class TestController {

    @Autowired
    TestInterfaces testInterfaces;

    @GetMapping("/test")
    public String getSayHi(){
        String s = testInterfaces.sayHi();
        return s;
    }

    @GetMapping("/testMap")
    public Map getTestMap(String key) {
        System.out.println("getTestMap-key:" + key);
        Map map = testInterfaces.getMap(key);
        return map;
    }

    @GetMapping("/testObj")
    public Person getPerson(@RequestParam("id") String id, @RequestParam("name") String name) {
        Person person = new Person(id, name);
        return  testInterfaces.getPerson(person);
    }
}