Spring Cloud中使用Eureka

一、创建00-eurekaserver-8000

（1）创建工程

创建一个Spring Initializr工程，命名为00-eurekaserver-8000，仅导入Eureka Server依赖即可

（2）pom.xml文件如下

若你使用的是JDK6、7、8，那么这些依赖无需导入。而JDK9及其以上版本需要导入






<?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>





 





    <groupId>com.abc</groupId>





    <artifactId>00-eurekaserver-8000</artifactId>





    <version>0.0.1-SNAPSHOT</version>





    <packaging>jar</packaging>





 





    <parent>





        <groupId>org.springframework.boot</groupId>





        <artifactId>spring-boot-starter-parent</artifactId>





        <version>2.1.7.RELEASE</version>





        <relativePath/> <!-- lookup parent from repository -->





    </parent>





 





    <properties>





        <java.version>1.8</java.version>





        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>





    </properties>





 





    <dependencies>





        <!--JAXB，Java Architechture for Xml Binding，XML绑定的Java技术





            JDK6、7、8版本的不用导入以下依赖，但9及其以上版本需要导入





        -->





        <!--<dependency>-->





        <!--<groupId>javax.xml.bind</groupId>-->





        <!--<artifactId>jaxb-api</artifactId>-->





        <!--<version>2.2.11</version>-->





        <!--</dependency>-->





        <!--<dependency>-->





        <!--<groupId>com.sun.xml.bind</groupId>-->





        <!--<artifactId>jaxb-core</artifactId>-->





        <!--<version>2.2.11</version>-->





        <!--</dependency>-->





        <!--<dependency>-->





        <!--<groupId>com.sun.xml.bind</groupId>-->





        <!--<artifactId>jaxb-impl</artifactId>-->





        <!--<version>2.2.11</version>-->





        <!--</dependency>-->





        <!--<dependency>-->





        <!--<groupId>javax.activation</groupId>-->





        <!--<artifactId>activation</artifactId>-->





        <!--<version>1.1.1</version>-->





        <!--</dependency>-->





 





 





        <dependency>





            <groupId>org.springframework.cloud</groupId>





            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>





        </dependency>





        <dependency>





            <groupId>org.springframework.boot</groupId>





            <artifactId>spring-boot-autoconfigure</artifactId>





        </dependency>





    </dependencies>





 





    <dependencyManagement>





        <dependencies>





            <dependency>





                <groupId>org.springframework.cloud</groupId>





                <artifactId>spring-cloud-dependencies</artifactId>





                <version>${spring-cloud.version}</version>





                <type>pom</type>





                <scope>import</scope>





            </dependency>





        </dependencies>





    </dependencyManagement>





 





    <build>





        <plugins>





            <plugin>





                <groupId>org.springframework.boot</groupId>





                <artifactId>spring-boot-maven-plugin</artifactId>





            </plugin>





        </plugins>





    </build>





 





</project>

（3）创建并配置yml文件






server:





  port: 8000





 





eureka:





  instance:





    hostname: localhost  # 指定Eureka主机





  client:





    register-with-eureka: false   # 指定当前主机是否向Eureka服务器进行注册





    fetch-registry: false    # 指定当前主机是否要从Eurka服务器下载服务注册列表





    service-url:   # 服务暴露地址





     defaultZone: http://localhost:8000/eureka





#     defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka





 





#  server:





#    enable-self-preservation: false    # 关闭自我保护

（4）定义spring boot启动类

二、创建提供者工程02-provider-8081

（1）创建工程

复制01-provider-8081，并重命名为02-provider-8081

https://blog.csdn.net/u012965203/article/details/99065322

（2）pom.xml依赖如下






<?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>org.springframework.boot</groupId>





        <artifactId>spring-boot-starter-parent</artifactId>





        <version>2.1.7.RELEASE</version>





        <relativePath/> <!-- lookup parent from repository -->





    </parent>





    <groupId>com.abc</groupId>





    <artifactId>02-provider-8081</artifactId>





    <version>0.0.1-SNAPSHOT</version>





    <name>02-provider-8081</name>





    <description>Demo project for Spring Boot</description>





 





    <properties>





        <java.version>1.8</java.version>





        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>





    </properties>





 





    <dependencies>





 





        <dependency>





            <groupId>com.alibaba</groupId>





            <artifactId>druid</artifactId>





            <version>1.1.10</version>





        </dependency>





 





        <!--actuator依赖-->





        <dependency>





            <groupId>org.springframework.boot</groupId>





            <artifactId>spring-boot-starter-actuator</artifactId>





        </dependency>





 





        <dependency>





            <groupId>org.springframework.boot</groupId>





            <artifactId>spring-boot-starter-data-jpa</artifactId>





        </dependency>





        <!--eureka客户端依赖-->





        <dependency>





            <groupId>org.springframework.cloud</groupId>





            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>





        </dependency>





 





        <!--修改MySQL驱动版本-->





        <dependency>





            <groupId>mysql</groupId>





            <artifactId>mysql-connector-java</artifactId>





            <version>5.1.47</version>





            <scope>runtime</scope>





        </dependency>





 





        <dependency>





            <groupId>org.springframework.boot</groupId>





            <artifactId>spring-boot-starter-web</artifactId>





        </dependency>





 





        <dependency>





            <groupId>org.projectlombok</groupId>





            <artifactId>lombok</artifactId>





            <optional>true</optional>





        </dependency>





        <dependency>





            <groupId>org.springframework.boot</groupId>





            <artifactId>spring-boot-starter-test</artifactId>





            <scope>test</scope>





        </dependency>





    </dependencies>





 





    <dependencyManagement>





        <dependencies>





            <dependency>





                <groupId>org.springframework.cloud</groupId>





                <artifactId>spring-cloud-dependencies</artifactId>





                <version>${spring-cloud.version}</version>





                <type>pom</type>





                <scope>import</scope>





            </dependency>





        </dependencies>





    </dependencyManagement>





 





    <build>





        <plugins>





            <plugin>





                <groupId>org.springframework.boot</groupId>





                <artifactId>spring-boot-maven-plugin</artifactId>





            </plugin>





        </plugins>





    </build>





 





</project>

（3）修改yml文件






server:





  port: 8081





 





spring:





  jpa:





    # 指定在Spring容器启动时是否自动建表，默认为false





    generate-ddl: true





    # 指定是否在控制台显示其执行的SQL语句，默认false





    show-sql: true





    # 指定应用重启时是否重新创建更新表





    hibernate:





      ddl-auto: none





 





  # 配置数据源





  datasource:





    type: com.alibaba.druid.pool.DruidDataSource





    driver-class-name: com.mysql.jdbc.Driver





    url: jdbc:mysql:///test?useUnicode=true&amp;characterEncoding=utf8





    username: root





    password: root





 





  # 指定当前微服务对象暴露的名称





  application:





    name: abcmsc-provider-depart





 





 





logging:





  # 设置日志输出格式





  pattern:





    console: level-%level %msg%n





  level:





    root: info





    org.hibernate: info





    org.hibernate.type.descriptor.sql.BasicBinder: trace





    org.hibernate.type.descriptor.sql.BasicExtractor: trace





    com.abc.provider: debug





 





# 指定Eureka服务中心





eureka:





  client:





    service-url:





         defaultZone: http://localhost:8000/eureka





      #    defaultZone: http://localhost:8100/eureka,http://localhost:8200/eureka,http://localhost:8300/eureka





 





  # 指定当前客户端主机在注册中心的名称





#  instance:





#    instance-id: abcmsc-provider-8081





 





info:





  company.name: www.abc.com





  company.addr: China Beijing





  company.tel: 12345678





  app.name: abc-msc





  app.desc: mic-server-cloud





  author: abc

三、创建消费工程02-consumer-8080

消费者将使用提供者暴露的服务名称(spring.application.name)来消费服务

（1）创建工程

复制01-consumer-8080，并重命名为02-consumer-8080

https://blog.csdn.net/u012965203/article/details/99065322

（2）添加依赖管理及依赖






<?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>





 





    <groupId>com.abc</groupId>





    <artifactId>02-consumer-8080</artifactId>





    <version>0.0.1-SNAPSHOT</version>





    <packaging>jar</packaging>





 





    <parent>





        <groupId>org.springframework.boot</groupId>





        <artifactId>spring-boot-starter-parent</artifactId>





        <version>2.1.3.RELEASE</version>





        <relativePath/> <!-- lookup parent from repository -->





    </parent>





 





    <properties>





        <java.version>1.8</java.version>





        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>





    </properties>





 





    <dependencies>





        <!--actuator依赖-->





        <dependency>





            <groupId>org.springframework.boot</groupId>





            <artifactId>spring-boot-starter-actuator</artifactId>





        </dependency>





        <!--eureka客户端依赖-->





        <dependency>





            <groupId>org.springframework.cloud</groupId>





            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>





            <version>2.1.2.RELEASE</version>





        </dependency>





 





        <dependency>





            <groupId>org.springframework.boot</groupId>





            <artifactId>spring-boot-starter-web</artifactId>





        </dependency>





 





        <dependency>





            <groupId>org.projectlombok</groupId>





            <artifactId>lombok</artifactId>





            <optional>true</optional>





        </dependency>





        <dependency>





            <groupId>org.springframework.cloud</groupId>





            <artifactId>spring-cloud-commons</artifactId>





            <version>2.1.2.RELEASE</version>





            <scope>compile</scope>





        </dependency>





 





 





    </dependencies>





 





    <dependencyManagement>





        <dependencies>





            <dependency>





                <groupId>org.springframework.cloud</groupId>





                <artifactId>spring-cloud-dependencies</artifactId>





                <version>${spring-cloud.version}</version>





                <type>pom</type>





                <scope>import</scope>





            </dependency>





        </dependencies>





    </dependencyManagement>





 





 





    <build>





        <plugins>





            <plugin>





                <groupId>org.springframework.boot</groupId>





                <artifactId>spring-boot-maven-plugin</artifactId>





            </plugin>





        </plugins>





    </build>





 





 





</project>

（3）修改yml文件






spring:





  application:





    name: abcmsc-consumer-depart





 





eureka:





  client:





    service-url:





          defaultZone: http://localhost:8000/eureka





    #  defaultZone: http://localhost:8100/eureka,http://localhost:8200/eureka,http://localhost:8300/eureka

（4）修改处理器

（5）修改JavaConfig类

四、测试

（1）启动eureka

（2）启动提供者

（3）启动消费者

（4）查看eureka服务列表

（5）测试功能

五、EurekaServer集群集群

这里要搭建的EurekaServer集群中包含三个EurekaServer节点，其端口号分别为8100、8200与8300

设置域名

在C:\Windows\System32\drivers\etc的host文件中添加如下域名映射信息






127.0.0.1 eureka8100.com





127.0.0.1 eureka8200.com





127.0.0.1 eureka8300.com

一、创建00-eurekaserver-8100

（1）创建工程

复制00-eurekaserver-8000工程，并重命名为00-eurekaserver-8100

（2）修改pom

（3）修改配置文件






server:





  port: 8100





 





eureka:





  instance:





    hostname: eureka8100.com    # 指定Eureka主机





  client:





    register-with-eureka: false   # 指定当前主机是否需要向注册中心注册（不用，因为当前主机是Server，不是Client）





    fetch-registry: false  # 指定当前主机是否需要获取注册信息（不用，因为当前主机是Server，不是Client）





    service-url:   # 暴露服务中心地址





      defaultZone: http://eureka8100.com:8100/eureka,http://eureka8200.com:8200/eureka,http://eureka8300.com:8300/eureka

（4）创建00-eurekaserver-8200

再以相同的方式再复制出00-eurekaserver-8200

（5）创建00-eurekaserver-8300

再以相同的方式再复制出00-eurekaserver-8300

（6）修改提供者配置文件

（7）修改消费者配置文件

（8）启动eureka8100.com

（9）启动eureka8200.com

（10）启动eureka8300.com

（11）启动消费者

（12）启动提供者

（13）查看提供服务列表