03. Feign

03. Feign

Feign使用面向api编程, 来简化编程 ,默认使用RoundRobbin,可以不需要额外配置负载均衡

在ribbon的基础上修改

1. microsoft-api

• 修改api的pom.xml添加

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

• 添加一个接口

  //name对应微服务名称
  @FeignClient("MICROSOFT-PROVIDER")
  public interface DeptClientService {
      //表示发送/provider/add请求到MICROSOFT-PROVIDER所在的服务
      @PostMapping(path = {"/provider/add"})
      boolean add(@RequestBody Dept dept);
  
      @GetMapping(path = "/provider/get/{id}")
       Dept get(@PathVariable("id") Integer id);
  
      @GetMapping(path = "/provider/get")
       List<Dept> list();
  }
  

2. 添加一个模块, 将consumer拷贝

• 添加依赖

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

• 修改controller

  @RestController
  @RequestMapping("/consumer")
  public class DeptConsumerController {
      @Autowired
      DeptClientService service;
      //controller中的mapping可以与接口中定义的不同,但是api接口中的mapping要与微服务定义的mapping相同
      @PostMapping(path = {"/add"})
      public boolean add(@RequestBody Dept dept){
          return service.add(dept);
      }
      @GetMapping(path = "/get/{id}")
      public Dept get(@PathVariable("id") Integer id){
          return service.get(id);
      }
  
      @GetMapping(path = "/get")
      public List<Dept> list(){
          return service.list();
      }
  }
  

• 修改主启动类

  //扫描对应@FeignClient修饰的接口所在包
  @EnableFeignClients({"com.chz.microsoftapi.service"})
  @EnableEurekaClient
  @SpringBootApplication
  public class MicrosoftConsumer80FeignApplication {
  
  	public static void main(String[] args) {
  		SpringApplication.run(MicrosoftConsumer80FeignApplication.class, args);
  	}
  }
  

  如果使用RoundRobbin来负载均衡就行, 那么就不用配置Ribbon