SpringCloud2020版本配置与环境搭建教程详解

1、maven父子工程搭建

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、配置application

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、启动类

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);
	}

}

4、运行结果

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。

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