SpringCloud学习（六）-- Feign客户端

港控/mmm° 2022-12-25 12:56 13阅读 0赞

# 一、添加依赖 #

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>

# 二、打开Feign调用 #

@SpringBootApplication
    @EnableDiscoveryClient //开启eureka客户端发现功能
    @EnableHystrix //开始hystrix
    @EnableFeignClients//开启feign功能
    public class ConsumerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ConsumerApplication.class,args);
        }
    
        @Bean
        @LoadBalanced//开启Ribbon的负载均衡，调用时，可以通过user-service名字，找到对应的服务。
        public RestTemplate restTemplate(){
            return new RestTemplate();
        }
    }

# 三、添加Feign客户端 #

主要是封装 服务提供方 user-service 成为 一个feign客户端

import com.wayne.feign.UserClient;
    import com.wayne.pojo.User;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/cf")
    public class ConsumerFeignController {
    
        @Autowired
        private UserClient userClient;
    
        @GetMapping("/{id}")
        public User queryById(@PathVariable Long id){
            return userClient.queryById(id);
        }
    }

# 四、测试 #

1，另外添加一个测试Controller

@RestController
    @RequestMapping("/cf")
    public class ConsumerFeignController {
    
        @Autowired
        private UserClient userClient;
    
        @GetMapping("/{id}")
        public User queryById(@PathVariable Long id){
            return userClient.queryById(id);
        }
    }

2，启动浏览器，输入[http://localhost:8080/cf/1][http_localhost_8080_cf_1]

浏览器出现

![2020120200175188.png][]

# 五、代码[传送门][Link 1] #

[http_localhost_8080_cf_1]: http://localhost:8080/cf/1
[2020120200175188.png]: /images/20221120/b5c35af89bec457b8dc8589d53525622.png
[Link 1]: https://gitee.com/wayneBatman007/spring-cloud-demo