Spring-Cloud

Eureka

• 包

  • Maven环境下:

  <!--https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-server-->
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
  </dependency>

• 配置文件

  • SpringBoot环境下:

  ---

  key: value: 含义: 注: |:-: | :-: | :-: | :-:| |eureka:instance:hostname|127.0.0.1|服务注册中心IP地址| |eureka:client:registerWithEureka|false|是否向服务注册中心注册自己| |eureka:client:fetchRegistry|false|是否检索服务| |eureka:client:serviceUrl|defaultZone:
  http://${eureka.instance.hostname}:
  ${server.port}/eureka/|服务注册中心的配置内容，指定服务注册中心的位置|

• 主要注解

  ---

  注解: 含义: 注: |:-: | :-: | :-:| |@EnableEurekaServer|启用Eureka服务端| |@EnableEurekaClient|如注册中心为Eureka,则推荐| |@EnableDiscoveryClient|注解中含有@EnableEurekaClient功能|

Feign

• 包

  • Maven环境下:(消费者中添加依赖)

  <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-feign -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-feign</artifactId>
        <version>1.4.6.RELEASE</version>
    </dependency>
  

• 主要步骤

  ---

  步骤 Demo 注 |-|-|-| |创建一个名为UserFeignClient接口|@FeignClient(name="user-api")
  public interface UserFeignClient{
  @RequestMapping(value="/getUser")
  public String getUser(@RequestParam("id")int id);
  }|注:@FeignClient("")注解中name值为微服务项目在EurekaServer中注册名称。
  或与spring.application.name一致 |创建一个类提供方法，通过接口调用Eureka提供者的方法|@RestController
  public class UserController{
  @Autowired
  private UserFeignClient userFeignClient;
  @RequestMapping("/getUser")
  public String getUser(){
  return userFeignClient.getUser(2);
  }
  }| |修改启动类|@RestController
  @SpringBootApplication
  @EnableEurekaClient
  @EnableFeignClients
  public class UserserviceApplication{
  public static void main(String[] args){
  SpringApplication.run(UserserviceApplication.class,args);
  }
  }|

  ---

Hystrix

• 主要步骤

  ---

  步骤 Demo 注 |-|-|-| |@FeignClient()加注解|@FeignClient(name="user-api",fallback=UserFeignClientFallBack.class)
  public interface UserFeignClient{
  @RequestMapping(value="/getUser")
  public String getUser(@RequestParam("id")int id);
  }| |创建容器处理类实现Feign接口|@Component
  public class UserFeignClientFallBack implements UserFeignClient{
  @Override
  public String getUser(int id){
  return "服务异常，请稍后重试";
  }
  }| |配置文件|feign:
  hystrix:
  enabled:true|

  ---