一.单点服务中心配置

Maven配置：

依赖选择：

Cloud Discovery -> Eareka Server

生成

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

依赖拷贝：无

配置文件

#服务名称
spring.application.name=eureka-center1
#服务端口
server.port=8000
#管理平台访问地址
eureka.client.service-url.defaultZone=http://localhost:${server.port}/eureka/
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

应用注解配置

//加入注解@EnableEurekaServer
@SpringBootApplication
@EnableEurekaServer
public class EurekaCenter1Application {
    public static void main(String[] args) {
        SpringApplication.run(EurekaCenter1Application.class, args);
    }
}

二.集群配置

---
spring:
  application:
    name: spring-cloud-eureka
  profiles: peer1
server:
  port: 8000
eureka:
  instance:
    hostname: peer1
  client:
    serviceUrl:
      defaultZone: http://peer2:8001/eureka/,http://peer3:8002/eureka/
---
spring:
  application:
    name: spring-cloud-eureka
  profiles: peer2
server:
  port: 8001
eureka:
  instance:
    hostname: peer2
  client:
    serviceUrl:
      defaultZone: http://peer1:8000/eureka/,http://peer3:8002/eureka/
---
spring:
  application:
    name: spring-cloud-eureka
  profiles: peer3
server:
  port: 8002
eureka:
  instance:
    hostname: peer3
  client:
    serviceUrl:
      defaultZone: http://peer1:8000/eureka/,http://peer2:8001/eureka/

host转换 /etc/host

127.0.0.1 peer1 
127.0.0.1 peer2
127.0.0.1 peer2 

打包

Idea的右侧的Maven Project->项目->Lifecycle->install->右键Run Maven Build
在target下生成项目的jar

启动

java -jar spring-cloud-eureka-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1
java -jar spring-cloud-eureka-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2
java -jar spring-cloud-eureka-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer3

浏览器输入：http://localhost:8000/

三.服务提供者配置：只用于向外提供服务，不能访问服务

Maven配置

依赖选择：

Web->Web
Cloud Discovery->Eureka Discovery

生成

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>

依赖拷贝：无

配置文件

spring.application.name=producer
server.port=9000
eureka.client.service-url.defaultZone=http://localhost:8000/eureka/

应用类注解

//添加注解@EnableDiscoveryClient
@SpringBootApplication
@EnableDiscoveryClient
public class ProducerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProducerApplication.class, args);
    }
}

控制器

//新建controller包新建HelloController类
@RestController
public class HelloController {
    @RequestMapping(value = "/hello")
    public String hello(@RequestParam("name") String name){
        return "hello "+name+"，this is first messge";
    }
}

访问

http://127.0.0.1:9000/hello?name=ppp

四.服务消费者配置

Maven配置

依赖选择：

Web->Web
Cloud Discovery->Eureka Discovery
Cloud Routing->Feign

生成

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>

依赖拷贝：无

配置文件：

spring.application.name=consumer
server.port=9001
eureka.client.service-url.defaultZone=http://localhost:8000/eureka/

应用类注解:

//添加注解@EnableDiscoveryClient @EnableFeignClients
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class ConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.class, args);
    }
}

feign调用实现

//新建remote包新建HelloRemote接口
@FeignClient(name = "producer")
public interface HelloRemote {
    @RequestMapping(value = "/hello")
    public String hello(@RequestParam("name") String name);
}

web层调用远程服务

//新建controller包新建ConsumerController类
@RestController
public class ConsumerController {
    @Autowired
    HelloRemote helloRemote;
    @RequestMapping("/hello/{name}")
    public String index(@PathVariable("name") String name) {
        return helloRemote.hello(name);
    }
}

调用

http://127.0.0.1:9001/hello/ppp

五.服务提供者负载均衡

只要两个服务的名子相同就会自动负载均衡
仿照producer创建工程，修改如下：

spring.application.name=producer
server.port=9003
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/

@RestController
public class HelloController {  
    @RequestMapping("/hello")
    public String index(@RequestParam String name) {
        return "hello "+name+"，this is producer 2  send first messge";
    }
}

//通过访问者访问时就会轮询访问不同的生产者服务
http://127.0.0.1:9001/hello/ppp