一、SpringCloud注册中心搭建
注册中心使用Eureka
早期artifactId使用spring-cloud-starter-eureka-server
但是新版需要使用spring-cloud-starter-netflix-eureka-server。
1. 新建一个maven工程
2. pom文件引入如下依赖
<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.ye</groupId>
<artifactId>eureka-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>eureka-server</name>
<description>eureka-server project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath />
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>
<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>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
3. 配置文件application.yml
server:
port: 8888
eureka:
instance:
hostname: localhost
client:
#是否向注册中心注册自己【自己就是注册中心,所以不需要注册自己】
registerWithEureka: false
#是否获取eureka注册中心上的注册信息【自己的职责就是维护服务,并不需要去检索服务】
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
4. 启动类
@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApp {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApp.class, args);
}
}
5. 启动
运行EurekaServerApp,在浏览器输入http://localhost:8888/ 即打开到配置中心页面。
此时,因为没有服务注册过来,所以列表是空的,后文再来创建一个服务注册到Eureka中来。
6. 注册中心高可用
注册中心高可用的时候,就需要将注册中心相互注册,此时就需要设置registerWithEureka和fetchRegistry都为true。配置文件如下:
server:
port: 9998
spring:
application:
name: eureka-group-server
eureka:
instance:
hostname: peer1
client:
registerWithEureka: true
fetchRegistry: true
serviceUrl:
defaultZone: http://peer3:9997/eureka/,http://peer2:9999/eureka/
peer1/peer2/peer3分别指向3个注册中心的地址,他们之间需相互注册。
二、服务搭建
1. 新建一个maven project
2. pom文件中引入如下依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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-actuator</artifactId>
</dependency>
3. 配置文件
server:
port: 8889
spring:
application:
name: demo-service
eureka:
instance:
ip-address: 127.0.0.1
prefer-ip-address: true
# 指定注册到注册中心的id,注册中心列表会展示成 127.0.0.1:8889:demo-service
instance-id: ${eureka.instance.ip-address}:${server.port}:${spring.application.name}
client:
serviceUrl:
# 注册中心地址
#defaultZone: http://peer1:9998/eureka/,http://peer2:9999/eureka/,http://peer3:9997/eureka/
defaultZone: http://localhost:8888/eureka/
4. 启动类
@EnableEurekaClient
@SpringBootApplication
public class DemoServiceApp {
public static void main(String[] args) {
SpringApplication.run(DemoServiceApp.class, args);
}
}
5. 启动
运行DemoServiceApp之后,注册中心就能看到demoservice的服务了
三、 其他说明
spring cloud中discovery service有许多种实现(eureka、consul、zookeeper等等)
@EnableDiscoveryClient基于spring-cloud-commons
@EnableEurekaClient基于spring-cloud-netflix。
如果选用的注册中心是eureka,那么就推荐@EnableEurekaClient,如果是其他的注册中心,那么推荐使用@EnableDiscoveryClient。
参考:https://blog.csdn.net/hh652400660/article/details/79474419