项目使用maven工程搭建，下面是工程的结构图。SpringCloud2020是父工程，仅负责依赖的管理，eureka是注册中心的服务端，testclient是测试的客户端。
1.1 父工程pom
<?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>org.example</groupId>
<artifactId>SpringCloud2020</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>eureka</module>
<module>testclient</module>
</modules>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<!-- Provide the latest stable Spring Cloud release train version (e.g. 2020.0.0) -->
<version>2020.0.0</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>
1.2 eureka子工程pom
<?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"> <parent> <artifactId>SpringCloud2020</artifactId> <groupId>org.example</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>eureka</artifactId> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies> </project>
1.3 testclient子工程pom
<?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"> <parent> <artifactId>SpringCloud2020</artifactId> <groupId>org.example</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>testclient</artifactId> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <!--引入WebStart--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> </project>
2.1 eureka 配置
server:
port: 20001 #eureka运行的端口号
address: 127.0.0.1 #注册中心运行地址
servlet:
context-path: /server #eureka注册中心管理界面地址
eureka:
client:
register-with-eureka: false #是否加入eureka注册表
fetch-registry: false #还是向eureka请求注册信息表
service-url:
defaultZone: http://${server.address}:${server.port}/eureka #注册中心地址，其它服务需要注册到该地址
2.1 testclient 配置
server:
port: 20002
# Spring
spring:
application:
name: test_service
# Eureka
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:20001/eureka #这里的port与eureka的端口对应
instance:
lease-renewal-interval-in-seconds: 5 # 每隔5秒发送一次心跳
lease-expiration-duration-in-seconds: 10 # 10秒不发送就过期
prefer-ip-address: true
instance-id: ${spring.application.name}:${server.port}
3.1 Eureka启动类EurekaApplication
package org.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
3.2 TestClient启动类TestClientApplication
package org.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class TestClientApplication {
public static void main(String[] args) {
SpringApplication.run(TestClientApplication.class, args);
}
}
如果没有意外，那么你将看到
如果启动testclient时报错
请检查testclient工程的依赖中是否存在下面的依赖项，如果没有，请添加。原因可能是eureka-client依赖spring-boot-starter-web
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
如果没有出现TEST_SERVICE，并且testclient出现以下报错
请检查testclient配置的defaultZone是否与eureka配置对应，并清空已经构建的内容，再重新启动eureka，testclient。
在testclient控制台看到以下日志信息，说明注册成功。
访问管理界面默认使用127.0.0.1:port，如果要改变它，请按照下面的提示配置
server:
port: 20001 #eureka运行的端口号
address: 127.0.0.1 #管理界面的地址
servlet:
context-path: /eureka-ui#管理界面的context-path
eureka:
client:
register-with-eureka: false #是否加入eureka注册表
fetch-registry: false #是否向eureka请求注册信息表
service-url:
defaultZone: http://127.0.0.1:${server.port}/eureka # 配置注册中心的地址，其它服务注册的时候使用。
