spring-cloud微服务整合openfeign_spring-cloud-starter-openfeign pom

spring-cloud整合openfeign

1. pom文件中引入依赖

		<!-- SpringCloud Openfeign -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!-- LoadBalancer 负载均衡-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>
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2. 启动类加上 @EnableFeignClients 注解，将 RestTemplate 和 客户端负载均衡结合使用，在启动类中注册Bean

	@Bean
    @LoadBalanced//默认使用轮询方式进行负载均衡
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
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3.如果说要调用另外一个服务下TestController 中的@GetMapping("/test")，前提是my-gateway这个服务已经注册进euaka或者nacos,则需要加上@FeignClient(“my-gateway”)//my-gateway代表要调用的服务名称

/*

@RestController
public class TestController {

    @Resource
    private TestService testService;
    
    @GetMapping("/test")
    public String test(){
        return "test";
    }
}
*/
@FeignClient("my-gateway")//my-gateway为要调用的服务名称  spring.application.name=my-gateway
public interface MyOpenFeignService {
    @GetMapping(value = "/test")
    public String test();
}
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4.将MyOpenFeignService注入到本服务的controller,调用方法即可

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.List;

/**
 * @author ssy
 * @date 2021/12/17 17:50
 */
@RestController
public class MyOpenFeignController {
	//将MyOpenFeignService注入进来
    @Resource
    private MyOpenFeignService myOpenFeignService;

    @GetMapping("/test")
    public String test(){
        return myOpenFeignService.test();
    }

}
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5.浏览器调用/test接口，看到返回“test”