Eureka - 实现服务治理（服务注册与发现），我们可以对所有的微服务进行集中管理，包括他们的运行状态、信息等。
父项目依赖
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.6.11</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>SpringCloudStudy</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>pom</packaging> <name>SpringCloudStudy</name> <description>SpringCloudStudy</description> <modules> <module>user-service</module> <module>book-service</module> <module>borrow-service</module> <module>commons</module> <module>eureka-server</module> <module>hystrix-dashboard</module> </modules> <properties> <java.version>1.8</java.version> </properties> <!--公共依赖--> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.24</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.29</version> </dependency> </dependencies> <!-- 版本管理--> <dependencyManagement> <dependencies> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.2.2</version> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>2021.0.1</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.1</version> <configuration> <source>1.8</source> <target>1.8</target> <encoding>UTF-8</encoding> </configuration> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
一、创建Eureka服务端集群
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.example</groupId> <artifactId>SpringCloudStudy</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>eureka-server</artifactId> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies> </project>
服务一与服务二相互注册形成集群
配置一
server: port: 8801 spring: application: name: eurekaserver eureka: instance: hostname: eureka01 client: fetch-registry: false service-url: defaultZone: http://eureka02:8802/eureka
配置二
server: port: 8802 spring: application: name: eurekaserver eureka: instance: hostname: eureka02 client: fetch-registry: false service-url: defaultZone: http://eureka01:8801/eureka
启动类
package com.minos; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @EnableEurekaServer @SpringBootApplication public class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run(EurekaServerApplication.class, args); } }
修改hosts文件
127.0.0.1 eureka02 127.0.0.1 eureka01
配置启动
启动服务端
http://localhost:8802/
http://localhost:8801/
二、客户端
依赖
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.example</groupId> <artifactId>SpringCloudStudy</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>book-service</artifactId> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> </dependency> <dependency> <groupId>com.example</groupId> <artifactId>commons</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> </project>
配置文件
server: port: 8201 # 数据库 spring: application: name: bookService datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/cloudstudy username: root password: 123456 eureka: client: # 跟上面一样，需要指向Eureka服务端地址，这样才能进行注册 service-url: defaultZone: http://eureka02:8802/eureka,http://eureka02:8801/eureka
启动类
package com.test; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient public class BookApplication { public static void main(String[] args) { SpringApplication.run(BookApplication.class,args); } }
启动客户端
bookService服务注册正常
三、服务端单机配置
server: port: 8888 eureka: # 开启之前需要修改一下客户端设置（虽然是服务端 client: # 由于我们是作为服务端角色，所以不需要获取服务端，改为false，默认为true fetch-registry: false # 暂时不需要将自己也注册到Eureka register-with-eureka: false # 将eureka服务端指向自己 service-url: defaultZone: http://localhost:8888/eureka
