Spring Cloud Netflix微服务开发(二) - 使用Feign调用服务

1. Feign简介

• Feign是Netflix开发的, 的Http客户端

• Feign可以帮助我们更加便捷，优雅地调用Http API

• 在Spring Cloud中,使用Feign非常简单, 创建一个接口, 并在接口上添加一些注解就好了

 

2. Feign实例

2-1) 创建Feign接口

添加Feign依赖

    org.springframework.cloud
    spring-cloud-starter-openfeign

UserFeignClient.java

@FeignClient(name = "microservice-provider-user")
@RequestMapping(value = "/user")
public interface UserFeignClient {
  @RequestMapping(value = "/{id}", method = RequestMethod.GET)
  public User findById(@PathVariable("id") Long id);
}

2-2) 调用Feign Client

MovieController.java

@RestController
public class MovieController {
  @Autowired
  private UserFeignClient userFeignClient;

  @GetMapping("/user/{id}")
  public User findById(@PathVariable Long id) {
    return this.userFeignClient.findById(id);
  }
}

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3. 测试

3-1) 启动eureka

3-2) 启动microservice-provider-user

3-3) 启动microservice-consumer-movie-feign

image.png

3-4) 访问服务消费者

image.png

本文的github代码地址：

https://github.com/davidgjy/springcloud-learn/tree/master/2_feign