Eureka 服务注册
在本章中,您将详细学习如何将Spring Boot 微服务应用程序注册到Eureka Server中。注册该应用程序之前,请确保Eureka Server在端口8761上运行,或者首先构建Eureka Server并运行它。有关构建Eureka服务器的更多信息,请参考上一章。首先,您需要在我们的构建配置文件中添加以下依赖项,以将微服务注册到Eureka服务器。
Maven用户可以将以下依赖项添加到pom.xml文件中-
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
Gradle用户依赖的代码如下
implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
完现在,我们需要在主Spring Boot应用程序类文件中添加@EnableEurekaClient注解。@EnableEurekaClient注解使您的Spring Boot应用程序充当Eureka客户端。
主要的Spring Boot应用程序类如下所示-
package com.jc2182.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class EurekaclientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaclientApplication.class, args);
}
}
要将Spring Boot应用程序注册到Eureka Server中,我们需要在application.properties文件或application.yml文件中添加以下配置,并在我们的配置中指定Eureka Server URL。
下面给出了application.yml文件的代码-
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka
instance:
preferIpAddress: true
spring:
application:
name: eurekaclient
下面给出了application.properties文件的代码-
eureka.client.serviceUrl.defaultZone = http://localhost:8761/eureka
eureka.client.instance.preferIpAddress = true
spring.application.name = eurekaclient
现在,在主Spring Boot应用程序中添加Rest Endpoint以返回String,并在构建配置文件中添加Spring Boot Starter Web依赖项。遵守下面给出的代码-
package com.jc2182.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@EnableEurekaClient
@RestController
public class EurekaclientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaclientApplication.class, args);
}
@RequestMapping(value = "/")
public String home() {
return "Eureka Client application";
}
}
整个配置文件如下。
Maven pom.xml
<?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>2.3.0.BUILD-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.jc2182</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<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-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<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>
</repository>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</pluginRepository>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
Gradle 用户 – build.gradle
plugins {
id 'org.springframework.boot' version '2.3.0.BUILD-SNAPSHOT'
id 'io.spring.dependency-management' version '1.0.9.RELEASE'
id 'java'
}
group = 'com.jc2182'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
repositories {
mavenCentral()
maven { url 'https://repo.spring.io/milestone' }
maven { url 'https://repo.spring.io/snapshot' }
}
ext {
set('springCloudVersion', "Hoxton.BUILD-SNAPSHOT")
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
}
}
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
}
}
test {
useJUnitPlatform()
}
您可以创建一个可执行的JAR文件,并使用以下Maven或Gradle命令运行Spring Boot应用程序-
对于Maven,请使用以下命令
在“BUILD SUCCESS”之后,您可以在target目录下找到JAR文件。
对于Gradle,请使用以下命令-
在“BUILD SUCCESSFUL”之后,您可以在build/libs目录下找到JAR文件。
现在,使用如下所示的命令运行JAR文件:
您会发现该应用程序已在Tomcat端口8080上启动。
在您的Web浏览器中访问URL http://localhost:8761/,您可以看到Eureka Client应用程序已在Eureka Server中注册。
现在,在Web浏览器中访问URL http://localhost:8080/并查看Rest Endpoint输出。