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分布式-SpringBoot-SpringCloud-Eureka

环境

Java version 1.8
SpringBoot version 2.1.7

搭建注册中心 Eureka-server

pom.xml 依赖如下所示：

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

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>

    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.bind</groupId>
        <artifactId>jaxb-impl</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jaxb</groupId>
        <artifactId>jaxb-runtime</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>

</dependencies>

配置 Eureka application.properties

# 应用启动端口
server.port=8090

# 注册中心管理中的 应用名称
spring.application.name=eureka-server

# 登陆注册管理中的的账号密码
spring.security.user.roles=SUPERUSER
spring.security.user.name=eureka
spring.security.user.password=123456

# 是否把自己注册到注册中心
eureka.client.register-with-eureka=true

# 是否从eureka上来获取服务的注册信息
eureka.client.fetch-registry=false

eureka.instance.hostname=localhost
eureka.client.serviceUrl.defaultZone=http://eureka:123456@localhost:8090/eureka

启动注册中心启动后访问(http://127.0.0.1:8090)
1. 登陆界面

分布式-SpringBoot-SpringCloud-Eureka

2. 输入设置的账号密码（user：eureka pwd：123456）

3. 进入注册中心页面

分布式-SpringBoot-SpringCloud-Eureka

需要注意的是需要处理下 CSRF 不然服务提供者注册不进来启动入口文件如下
EurekaServiceApplication.java

@EnableEurekaServer
@SpringBootApplication
public class EurekaServiceApplication {

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


    /**
     * 忽略 uri /eureka/** 的CSRF检测
     */
    @EnableWebSecurity
    static class WebSecurityConfig extends WebSecurityConfigurerAdapter {
        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http.csrf().ignoringAntMatchers("/eureka/**");
            super.configure(http);
        }
    }
}

简单的注册中心已经搭建完成

搭建服务提供者 Provider-service

首先还是配置文件 application.properties

服务端口
server.port=8081

# 服务应用名称
spring.application.name=provider-ticket

# 是否允许使用ip连接
eureka.instance.ip-address=true

# 注意 http://用户名:密码@主机:端口/eureka 需要与服务中心里配置的一样
eureka.client.serviceUrl.defaultZone=http://eureka:123456@localhost:8090/eureka

启动项目后会自动把服务注册到配置的服务中心
以下是我做的测试代码

分布式-SpringBoot-SpringCloud-Eureka

TicketController.java

package com.yourdream.providerticket.controller;

import com.yourdream.providerticket.service.TicketService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TicketController {

    @Autowired
    TicketService ticketService;

    @GetMapping("/ticket")
    public String getTicket(){
        System.out.println("server-8081");
        return ticketService.getTicket();
    }
}

TicketService

package com.yourdream.providerticket.service;

import org.springframework.stereotype.Service;

@Service
public class TicketService {

    public String getTicket()
    {
        return "《哪吒之魔童降世》";
    }
}

ProviderTicketApplication

package com.yourdream.providerticket;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ProviderTicketApplication {

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

}

到此一个简单的服务提供者搭建完成

搭建服务消费者 Consumer-user

首先还是配置文件 application.properties

server.port=8100
spring.application.name=consumer-user
eureka.client.serviceUrl.defaultZone=http://eureka:123456@localhost:8090/eureka
eureka.instance.ip-address=true

首先需要明确消费者与服务提供者之间通讯协议是 HTTP
看下实例代码

分布式-SpringBoot-SpringCloud-Eureka

启动入口 ConsumerUserApplication.java

package com.yourdream.consumeruser;

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.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableDiscoveryClient //开启发现服务功能
@SpringBootApplication
public class ConsumerUserApplication {

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

    @LoadBalanced //开启负载均衡器
    @Bean //注册 RestTemplate 服务
    public RestTemplate restTemplate()
    {
        return new RestTemplate();
    }
}

UserController.java

package com.yourdream.consumeruser.controller;

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


@RestController
public class UserController {

    // 帮助我们向 注册的实例服务 发起http请求
    @Autowired
    RestTemplate restTemplate;

    @GetMapping("/buy")
    public String buyTicket(String name)
    {
        //PROVIDER-TICKET 服务提供者名称
        String forObject = restTemplate.getForObject("http://PROVIDER-TICKET/ticket", String.class);
        return name + "购买了" + forObject;
    }
}