springCloud --Eureka

Posted 2021-03-12 张含韵好可爱

单台Eureka

1. 首选准备一台Eureka（注册中心-----淘宝电商平台）

pom添加这个依赖文件

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>

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yml文件

server:
  port: 9000
eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: false #是否将自己注册到注册中心
    fetch-registry: false  #是否从eureka中获取注册信息
    service-url:
      defaultZone: http://localhost:9000/eureka/

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主程序入口

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {

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

}

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2. 准备一台Eureka服务（服务提供者--------淘宝上的商家）

pom文件

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.2.1.RELEASE</version>
        </dependency>

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yml文件 （hello很关键和后面使用的地址名相关）

server:
  port: 8001
eureka:
  client:
    service-url:
      defaultZone: http://localhost:9000/eureka
  instance:
    prefer-ip-address: on
spring:
  application:
    name: hello

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主程序入口

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaServiceApplication {

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

}

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服务的controller

@RestController
public class HelloController {

    @GetMapping("/hello")
    public String hello(String msg) {
        System.out.println(msg);
        return "后台返回成功";
    }

}

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服务的service，接口UserService放在common中

@Service
public class UserServiceImpl implements UserService{

    @Override
    public String getString(String msg) {

        try {
            System.out.println(msg);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return "接收成功";
    }

}

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3.准备Eureka客户（服务消费者-------各位买家）

pom文件

   <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.2.1.RELEASE</version>
        </dependency>

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yml文件

server:
  port: 3001
eureka:
  client:
    service-url:
      defaultZone: http://localhost:9000/eureka
    register-with-eureka: false

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主程序入口，这儿的@LoadBalanced 是Ribbon的

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaClientApplication {

    @LoadBalanced //负载均衡注解
    @Bean
    public RestTemplate getRestTemplate() {
        SimpleClientHttpRequestFactory f = new SimpleClientHttpRequestFactory();
        f.setConnectTimeout(1000);
        f.setReadTimeout(1000);
        return new RestTemplate(f);
    }

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

}

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客户接受浏览器的请求的controller，这儿的url在没有ribbon时需要用ip+端口的形式使用

@RestController
public class HelloController {

    @Autowired
    private RestTemplate template;


    /**
     *  http://hello/hello?msg={1}  第一个hello是上面的服务提供者的名字，第二个hello是服务提供者的请求的路径/hello,msg是携带的参数，
     *  {1}，是后面参数列表的第一个参数映射到这个位置，
     * @return
     */
    @GetMapping("/hello")
    public String hello() {
        System.out.println("hello");
        template.getForObject("http://hello/hello?msg={1}",java.lang.String.class,"测试");
        return "测试成功";
    }

}

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 则表示Eureka成功