业务需求

eureka简介
引入依赖
修改配置
创建provider和consumer
测试

1.eureka简介

Spring Cloud Eureka 是Spring Cloud Netflix 微服务套件中的一部分，它基于Netflix Eureka 做了二次封装，主要负责完成微服务架构中的服务治理功能。
Spring Cloud 通过为Eureka 增加了Spring Boot 风格的自动化配置，我们只需通过简单引入依赖和注解配置就能让Spring Boot 构建的微服务应用轻松地与Eureka 服务治理体系进行整合。
Eureka 提供的服务端，提供服务注册与发现的功能，一般被称作eureka-server。

2.目录结构

在这里插入图片描述

3.创建cloud-eureka-server7001

Server端引入依赖

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

    <!--自定义api通用包-->
    <dependency>
        <groupId>com.study.cloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
 #如果单纯的引入Eureka server相关的依赖，不用引入这个依赖，这个依赖是我本地的commons模块，自己测试用的
        <dependency>
            <groupId>com.study.cloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
#用于热部署
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
#lombok插件
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
# 用于swagger，方便测试
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.8.6</version>
        </dependency>
# 用于swagger，方便测试
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
    </dependencies>

创建模块，并且修改yaml文件

yaml配置文件

server:
  port: 7001

eureka:
  instance:
    hostname:   eureka7001.com#eureka服务端实例名称
  client:
    register-with-eureka: false #表示不像注册中心注册自己
    fetch-registry: false #false表示自己就是注册中心，我的职责就是维护服务实例,并不区检索服务
    service-url:
      defaultZone: http://eureka7002.com:7002/eureka/      #集群模式下，向别的eureka注册
#      defaultZone: http://eureka7001.com:7001/eureka/     单机模式下，向自己注册

#  server:
#    enable-self-preservation: false # 关闭自我保护机制 保证不可用服务及时清除
#    eviction-interval-timer-in-ms: 2000

创建启动类，并且添加注解

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

@EnableEurekaServer
@SpringBootApplication
public class EurekaMain7001 {
    public static void main(String[] args) {
        SpringApplication.run(EurekaMain7001.class,args);
    }
}

4.创建cloud-eureka-server7002（类比7001创建）

引入依赖

引入的依赖和7001的依赖相同

创建模块，并且修改yaml配置文件

yaml配置文件

server:
  port: 7002

eureka:
  instance:
    hostname: eureka7002.com #eureka服务端实例名称
  client:
    register-with-eureka: false #表示不向注册中心注册自己
    fetch-registry: false #false表示自己就是注册中心，我的职责就是维护服务实例,并不区检索服务
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/

创建启动类，并且添加注解

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

@EnableEurekaServer
@SpringBootApplication
public class EurekaMain7001 {
    public static void main(String[] args) {
        SpringApplication.run(EurekaMain7001.class,args);
    }
}

5.创建cloud-provider-payment8001模块

引入依赖

         <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        
       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

修改yaml配置文件

server:
  port: 8001
  servlet:
    context-path: /v1payp
spring:
  application:
    name: cloud-payment-service
  datasource:
    type:  com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver              # mysql驱动包
    url:  jdbc:mysql://localhost:3306/db2021?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password:
mybatis:
  mapperLocations: classpath:mapper/*.xml
  type-aliases-package: com.study.cloud.entities    # 所有Entity别名类所在包
eureka:
  client:
    #表示是否将自己注册金eurekaserver
    register-with-eureka: true
    #是否从eureka抓取自己的注册信息，默认为true，集群必须为true才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,   http://eureka7002.com:7002/eureka/
  instance:
    instance-id: payment8001                      #主机名称
    prefer-ip-address: true                       #表示访问路径是否显示ip地址

创建启动类并添加注解

@EnableEurekaClient
@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8001.class,args);
    }
}

6.类比cloud-provider-payment8001，创建8002

7.创建cloud-provider-consumer80模块

引入依赖

  <dependencies>
 #如果单纯的引入Eureka server相关的依赖，不用引入这个依赖，这个依赖是我本地的commons模块，自己测试用的
        <dependency>
            <groupId>com.study.cloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
#用于热部署
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
#lombok插件
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
# 用于swagger，方便测试
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.8.6</version>
        </dependency>
# 用于swagger，方便测试
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
    </dependencies>

修改yaml配置文件

yaml配置文件

server:
  port: 80
  servlet:
    context-path: /v1payc
spring:
  application:
    name: cloud-consumer-order80

eureka:
  client:
    #表示是否将自己注册金eurekaserver
    register-with-eureka: true
    #是否从eureka抓取自己的注册信息，默认为true，集群必须为true才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,   http://eureka7002.com:7002/eureka/

创建启动类并添加注解

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

@EnableEurekaClient
@SpringBootApplication
public class OrderMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderMain80.class,args);
    }
}