Feign负载均衡

公共模块改造

导入依赖

        <!--feign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

编写FeignClient，@FeignClient(value = "SPRINGCLOUD-PROVIDER-DEPT")，添加Eureka中服务提供方的名称，再通过url访问时即可调用该服务中对应的api接口

//@Component
@FeignClient(value = "SPRINGCLOUD-PROVIDER-DEPT")
public interface DeptClientService {

    @GetMapping("/dept/get/{id}")
    public Dept queryById(@PathVariable("id") Long id);

    @GetMapping("/dept/list")
    public List<Dept> queryll();

    @PostMapping("/dept/add")
    public boolean addDept(Dept dept);

}

服务消费方改造

导入依赖

        <!--feign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

        <!--eureka-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

编写配置文件

# Eureka配置
eureka:
  client:
    register-with-eureka: false #不向Eureka注册自己
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/

开启相关功能

// Ribbon和Eureka整合以后，客户端可以直接调用，不用关心ip地址和端口号
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages = {"com.song.springcloud"})
//@ComponentScan("com.song.springcloud")
// 在微服务启动的时候就能去加载我们自定义的Ribbon类
public class FeignDeptConsumer_80 {

    public static void main(String[] args) {
        SpringApplication.run(FeignDeptConsumer_80.class, args);
    }

}

编写Controller层，Controller调用公共模块的接口

@RestController
public class DeptConsumerController {

    // 理解：消费者，不应该有service层
    // RestTemplate ... 供我们直接调用就可以了！注册到Spring中
    // (url,实体:map,Class<T> responseType)
    @Autowired
    private RestTemplate restTemplate;//提供多种便捷访问远程http服务的方法，简单restful服务模板

    @Autowired
    private DeptClientService service = null;

    @RequestMapping("/consumer/dept/add")
    public boolean add(Dept dept) {
        return this.service.addDept(dept);
    }

    // http://127.0.0.1:8001/dept/list
    @RequestMapping("/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id")Long id) {
        return this.service.queryById(id);
    }

    @RequestMapping("/consumer/dept/list")
    public List<Dept> list() {
        return this.service.queryll();
    }

}