1. eureka服务注册

1.1注册中心，服务端

引入jar

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

主类增加注解@EnableEurekaServer

@SpringBootApplication
@EnableEurekaServer
public class Eureka7000Application {
    public static void main(String[] args) {
        SpringApplication.run(Eureka7000Application.class, args);
    }
}

文件配置：application.yml

s.hello.com www.hello.com 分别是自己注解hosts文件中主机指向地址，当部署到不同的机器使用不同的ip即可

---
spring:
  profiles: 7080
  application:
    name: eureka-7080
server:
  port: 7080
eureka:
  client:
    fetch-registry: false # 不需要检索服务
    register-with-eureka: false # 不向自己注册
    serviceUrl:
      defaultZone: http://www.hello.com:7081/eureka
  instance:
    hostname: s.hello.com
    prefer-ip-address: true

---
spring:
  profiles: 7081
  application:
    name: eureka-7081
server:
  port: 7081
eureka:
  client:
    fetch-registry: false # 不需要检索服务
    register-with-eureka: false # 不向自己注册
    serviceUrl:
      defaultZone: http://s.hello.com:7080/eureka
  instance:
    hostname: www.hello.com
    prefer-ip-address: true # eureka ha机制需要加上这个

1.2 eureka客户端，向server注册服务

mic-eureka-6000微服务客户端

主类：

@SpringBootApplication
@EnableDiscoveryClient
public class Eureka6000Application {
    public static void main(String[] args) {
        SpringApplication.run(Eureka6000Application.class, args);
    }
}

配置文件

spring:
  application:
    name: eureka-6000 # 负载均衡的时候必须保持一致,注册到服务端的名称
eureka:
  instance:
    hostname: eureka01.com
    prefer-ip-address: true
    instance-id: eureka01.com # 负载均衡的时候此处不能一致，或者可以不写
  client:
    serviceUrl:
      defaultZone: http://s.hello.com:7080/eureka,http://www.hello.com:7081/eureka

定义接口

@RestController
public class TestController {

    @RequestMapping("/sayhello")
    public String hello(){
        return "hello-6001";
    }
}

1.3 Ribbon使用eureka-6000

mic-ribbon-8000

@SpringBootApplication
@EnableEurekaClient
public class MicRibbon8000Application {
    public static void main(String[] args) {
        SpringApplication.run(MicRibbon8000Application.class, args);
    }
}

配置文件

server:
  port: 8000
eureka:
  client:
    service-url:
      defaultZone: http://s.hello.com:7080/eureka, http://www.hello.com:7080/eureka
spring:
  application:
    name: ribbon-8000

配置负载均衡

@Configuration
public class ApplicationContext {
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

使用eureka-6000中的接口

http://EUREKA-6000/sayhello 必须为mic-eureka-6000微服务中spring.application.name的value

@RestController
public class ConsumerController {

    private static final String COMMON_PATH = "http://EUREKA-6000/sayhello";

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/hello")
    public String sayHello() {
        return restTemplate.getForEntity(COMMON_PATH, String.class).getBody();
    }
}

springcloud学习笔记-eureka