spring cloud Eureka 实战

于 2018-06-15 16:53:58 发布
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分类专栏： spring cloud
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本文链接：https://blog.youkuaiyun.com/aiyongbo123456/article/details/80706979
本文介绍如何构建一个基于Spring Cloud Eureka的服务注册中心，并通过三个Maven项目实现服务提供者和服务消费者的示例。文章详细展示了项目的POM配置、属性文件设置及代码结构。

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构建一个简单的spring cloud Eureka应用实例，话不所说，上项目
一、使用构建三个简单的maven项目


二、eureka项目：
1、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>springcloud</groupId>
	<artifactId>eureka</artifactId>
	<version>1.0.0-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>eureka</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.7.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>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka-server</artifactId>
			<version>1.3.0.RELEASE</version>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
        	<groupId>com.sun.jersey</groupId>
       		<artifactId>jersey-bundle</artifactId>
         	<version>1.19</version>
     	</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin> 
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				 <configuration>
		        <requiresUnpack>
		                <dependency>
		                        <groupId>com.sun.jersey</groupId>
		                        <artifactId>jersey-server</artifactId>
		                </dependency>
		                <dependency>
		                        <groupId>com.sun.jersey</groupId>
		                        <artifactId>jersey-core</artifactId>
		                </dependency>
		                <dependency>
		                        <groupId>com.sun.jersey</groupId>
		                        <artifactId>jersey-servlet</artifactId>
		                </dependency>
		        </requiresUnpack>
		    </configuration>
			</plugin>
		</plugins>
	</build>


</project>


2、application.properties
# 由于该应用为注册中心，所以设置为false，代表不向注册中心注册自己
eureka.client.fetch-registry=false
# 由于注册中心的职责就是维护服务实例，他并不需要去检索服务，所以也设置为false
eureka.instance.hostname=localhost
server.port=9001
eureka.client.register-with-eureka=false
eureka.client.service-url.defaultZone= http://${eureka.instance.hostname}:${server.port}/eureka/

#配置属性，但由于 Eureka 自我保护模式以及心跳周期长的原因，经常会遇到 Eureka Server 不剔除已关停的节点的问题
# 关闭自我保护
eureka.server.enable-self-preservation=false
#清理间隔（单位毫秒，默认是60*1000）
eureka.server.eviction-interval-timer-in-ms=5000


3、代码三、ceshi项目：1、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>ceshi</groupId>
	<artifactId>ceshi</artifactId>
	<version>1.0.0-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>ceshi</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.7.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>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
			<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
			<version>1.3.0.RELEASE</version>
		</dependency>
		<!-- <dependency> 
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
			<version>1.3.0.RELEASE</version>
		</dependency> -->
		
		<dependency>
			<groupId>com.oracle</groupId>
			<artifactId>ojdbc6</artifactId>
			<version>11.2.0.3.0</version>
			<scope>system</scope>
			<systemPath>${project.basedir}/lib/sqljdbc4-4.0.jar</systemPath>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		 <!-- 引入ribbon包 -->  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-starter-ribbon</artifactId>  
            <version>1.3.0.RELEASE</version>
        </dependency>  
	</dependencies>
	
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

	<!-- 仓库地址 -->
	<repositories>
		<repository>
			<id>spring-milestone</id>
			<url>http://repo.spring.io/libs-release</url>
		</repository>
	</repositories>
</project>


2、application.properties
# spring boot服务注册到Eureka Server上的应用名称  
spring.application.name=ribbon-consumer  
eureka.instance.prefer-ip-address=true
#eureka.client.fetch-registry=true
eureka.instance.lease-renewal-interval-in-seconds=30
eureka.instance.lease-expiration-duration-in-seconds=90  
# Eureka Server注册服务的地址  
eureka.client.service-url.defaultZone=http://localhost:9001/eureka/

server.port=10097


# spring bo

3、代码




四、client项目：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>springcloud</groupId>
	<artifactId>client</artifactId>
	<version>1.0.0-SNAPSHOT</version>
	<packaging>jar</packaging>


	<name>client</name>
	<description>Demo project for Spring Boot</description>


	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.7.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>
	</properties>


	<dependencies>
	
		<dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
        </dependency>  
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>


		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
			<version>1.3.0.RELEASE</version>
		</dependency>
	</dependencies>
	
	
	<build>
		<!-- 打成jar包的名称 -->
		<finalName>client-1.0.0</finalName>
		<plugins>
			<!-- 需要引用的jar包 -->
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
      		 	 	<includeSystemScope>true</includeSystemScope>
    			</configuration>
			</plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
				<jvmArguments>-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8080 </jvmArguments>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<!-- <build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build> -->

</project>

2、application.properties
# spring boot\u670D\u52A1\u6CE8\u518C\u5230Eureka Server\u4E0A\u7684\u5E94\u7528\u540D\u79F0  
spring.application.name=hello-service
eureka.instance.prefer-ip-address=true
#eureka.client.fetch-registry=true
eureka.instance.lease-renewal-interval-in-seconds=30
eureka.instance.lease-expiration-duration-in-seconds=90  
# Eureka Server\u6CE8\u518C\u670D\u52A1\u7684\u5730\u5740  
eureka.client.service-url.defaultZone=http://localhost:9001/eureka/
server.port=10098


3、代码：

五、运行结果
三个项目构建完毕后，全部启动
配置中心运行结果：

服务提供者:

调用服务者：

在ceshi项目中，调用了client项目提供的服务，返回跟client项目相同的结果：“”HelloWorld!“”，调用成功！

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