SpringCloud第二弹（高可用Eureka+Ribbon负载均衡）

先建立父工程

..

..一路next

搭建注册中心（需要建立三个工程，端口不一样）

..

..

..

修改入口类

package com.cloud.eurekaserver1111;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaServer1111Application {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServer1111Application.class, args);
    }
}

修改属性文件（一共建立三个Eureka-Server服务，端口分别为1111,2222,3333）

server.port=1111

eureka.instance.hostname=server.one.com
eureka.client.fetch-registry=false
eureka.client.register-with-eureka=false
eureka.client.service-url.defaultZone=http://server.two.com:2222/eureka,http://server.three.com:3333/eureka

..

server.port=2222

eureka.instance.hostname=server.two.com
eureka.client.fetch-registry=false
eureka.client.register-with-eureka=false
eureka.client.service-url.defaultZone=http://server.one.com:1111/eureka,http://server.three.com:3333/eureka

..

server.port=3333

eureka.instance.hostname=server.three.com
eureka.client.fetch-registry=false
eureka.client.register-with-eureka=false
eureka.client.service-url.defaultZone=http://server.one.com:1111/eureka,http://server.two.com:2222/eureka

..

修改hosts文件（C:\Windows\System32\drivers\etc）

127.0.0.1 server.one.com
127.0.0.1 server.two.com
127.0.0.1 server.three.com

修改pom文件，把parent改成父工程

    <parent>
        <groupId>com.cloud</groupId>
        <artifactId>cloud-parent-two</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

 建立服务提供者-8081

..

..

..

修改pom

    <parent>
        <groupId>com.cloud</groupId>
        <artifactId>cloud-parent-two</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

修改入口类：

package com.cloud.bookservice8081;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class BookService8081Application {

    public static void main(String[] args) {
        SpringApplication.run(BookService8081Application.class, args);
    }
}

修改属性文件

server.port=8081
# 服务名
spring.application.name=BookService

# 注册地址
eureka.client.service-url.defaultZone=http://server.one.com:1111/eureka,http://server.two.com:2222/eureka,http://server.three.com:3333/eureka
# 注册名
eureka.instance.instance-id=book-service:8081
eureka.instance.prefer-ip-address=true

新建controller

package com.cloud.bookservice8081.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@Slf4j
@RestController
public class BookController {

    @Autowired
    private DiscoveryClient discoveryClient;

    @RequestMapping("/book")
    public String index(){
        List<String> services = discoveryClient.getServices();
        services.forEach(e -> log.info("book-service:8081:" + e));
        List<ServiceInstance> list = discoveryClient.getInstances("BOOKSERVICEPROVIDER");
        list.forEach(e -> {
            log.info("book-service:8081:" + e.getServiceId() + "," + e.getHost() + "," + e.getPort() + "," + e.getUri());
        });
        return "{\n" +
                "  \"bookName\": \"Apache Kafka实战\",\n" +
                "  \"bookSize\": \"16开\",\n" +
                "  \"pack\": \"平装\",\n" +
                "  \"isbn\": \"9787121337765\",\n" +
                "  \"publisher\": \"电子工业出版社\",\n" +
                "  \"publishTime\": \"2018-05-01\",\n" +
                "  \"service\": \"book-service:8081\"\n" +
                "}";
    }
}

建立服务提供者-8082

..

..

修改pom

    <parent>
        <groupId>com.cloud</groupId>
        <artifactId>cloud-parent-two</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

修改入口类

package com.cloud.bookservice8082;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class BookService8082Application {

    public static void main(String[] args) {
        SpringApplication.run(BookService8082Application.class, args);
    }
}

修改属性文件

server.port=8082
# 服务名
spring.application.name=BookService

# 注册地址
eureka.client.service-url.defaultZone=http://server.one.com:1111/eureka,http://server.two.com:2222/eureka,http://server.three.com:3333/eureka
# 注册名
eureka.instance.instance-id=book-service:8082
eureka.instance.prefer-ip-address=true

增加controller

package com.cloud.bookservice8082.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@Slf4j
@RestController
public class BookController {

    @Autowired
    private DiscoveryClient discoveryClient;

    @RequestMapping("/book")
    public String index(){
        List<String> services = discoveryClient.getServices();
        services.forEach(e -> log.info("book-service:8082:" + e));
        List<ServiceInstance> list = discoveryClient.getInstances("BOOKSERVICEPROVIDER");
        list.forEach(e -> {
            log.info("book-service:8082:" + e.getServiceId() + "," + e.getHost() + "," + e.getPort() + "," + e.getUri());
        });
        return "{\n" +
                "  \"bookName\": \"Apache Kafka实战\",\n" +
                "  \"bookSize\": \"16开\",\n" +
                "  \"pack\": \"平装\",\n" +
                "  \"isbn\": \"9787121337765\",\n" +
                "  \"publisher\": \"电子工业出版社\",\n" +
                "  \"publishTime\": \"2018-05-01\",\n" +
                "  \"service\": \"book-service:8082\"\n" +
                "}";
    }
}

最后建立消费者-8080

..

..

修改pom

    <parent>
        <groupId>com.cloud</groupId>
        <artifactId>cloud-parent-two</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

修改入口类（配置了@LoadBalanced注解的Bean）

package com.cloud.bookconsumer8080;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableDiscoveryClient
@EnableEurekaClient
public class BookConsumer8080Application {

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

    public static void main(String[] args) {
        SpringApplication.run(BookConsumer8080Application.class, args);
    }
}

属性文件

server.port=8080

eureka.client.register-with-eureka=false
eureka.client.service-url.defaultZone=http://server.one.com:1111/eureka,http://server.two.com:2222/eureka,http://server.three.com:3333/eureka

controller

package com.cloud.bookconsumer8080.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class BookController {

    private static final String PREFIX = "http://BOOKSERVICE";  // 微服务名字

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("consumeBook")
    public String index(){
        return restTemplate.getForEntity(PREFIX + "/book",String.class).getBody();
    }
}

与上一节不同，这次指向的是服务名

目录结构

 下面开始运行

访问 http://server.one.com:1111/ 出现

可以看见当前Eureka连接另外两个Eureka，证明注册中心高可用集群搭建成功。

再看下面的服务，有两个，证明服务已经注册进来了

下面访问消费者 http://localhost:8080/consumeBook

刷新

证明负载均衡也成功了

GitHub