Eureka Server是一个包含所有客户端服务应用程序信息的应用程序.每个Micro服务都将注册到Eureka服务器,Eureka服务器知道在每个端口和IP地址上运行的所有客户端应用程序. Eureka Server也称为Discovery Server.
在本章中,我们将详细了解如何构建Eureka服务器.
Eureka Server随附Spring Cloud捆绑包.为此,我们需要开发Eureka服务器并在默认端口8761上运行.
访问Spring Initializer主页 https://start.spring.io/并下载具有Eureka服务器依赖性的Spring Boot项目.它显示在下面的屏幕截图中 :
在主Spring Boot Application类文件中下载项目后,我们需要添加@EnableEurekaServer注释. @EnableEurekaServer注释用于使您的Spring Boot应用程序充当Eureka服务器.
主Spring Boot应用程序类文件的代码如下所示 :
package com.it1352.eurekaserver; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @SpringBootApplication @EnableEurekaServer public class EurekaserverApplication { public static void main(String[] args) { SpringApplication.run(EurekaserverApplication.class, args); } }
确保在构建配置文件中添加了Spring cloud Eureka服务器依赖项.
Maven用户依赖的代码如下所示 :
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId> </dependency>
Gradle用户依赖的代码低于 :
compile('org.springframework.cloud:spring-cloud-starter-eureka-server')
完整的构建配置文件在下面给出 :
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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.IT屋</groupId> <artifactId>eurekaserver</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>eurekaserver</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</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> <spring-cloud.version>Edgware.RELEASE</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-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>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
Gradle - build.gradle
buildscript { ext { springBootVersion = '1.5.9.RELEASE' } repositories { mavenCentral() } dependencies { classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}") } } apply plugin: 'java' apply plugin: 'eclipse' apply plugin: 'org.springframework.boot' group = 'com.it1352' version = '0.0.1-SNAPSHOT' sourceCompatibility = 1.8 repositories { mavenCentral() } ext { springCloudVersion = 'Edgware.RELEASE' } dependencies { compile('org.springframework.cloud:spring-cloud-starter-eureka-server') testCompile('org.springframework.boot:spring-boot-starter-test') } dependencyManagement { imports { mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}" } }
默认情况下,Eureka Server注册本身进入发现.您应该将以下给定的配置添加到application.properties文件或application.yml文件中.
application.properties文件在下面给出 :
eureka.client.registerWithEureka = false eureka.client.fetchRegistry = false server.port = 8761
application.yml文件在下面给出 :
eureka: client: registerWithEureka: false fetchRegistry: false server: port: 8761
现在,您可以创建一个可执行的JAR文件,使用下面显示的Maven或Gradle命令运行Spring Boot应用程序 :
对于Maven,使用如下所示的命令 :
mvn clean install
在"BUILD SUCCESS"之后,您可以在目标目录下找到JAR文件.
对于Gradle,您可以使用t他的命令显示如下 :
gradle clean build
之后" "BUILD SUCCESSFUL",你可以在build/libs目录下找到JAR文件.
现在,使用以下命令运行JAR文件 :
java -jar <JARFILE>
你可以发现应用程序已经在Tomcat端口8761上启动,如下所示 :
现在,点击URL http://localhost:8761/在您的Web浏览器中,您可以找到在端口8761上运行的Eureka Server,如下所示 :