微服务SpringCloud之Spring Cloud Config配置中心服务化
- 2019 年 10 月 3 日
- 筆記
在前面两篇Spring Cloud Config配置中心的博客中都是需要指定配置服务的地址url：spring.cloud.config.uri，客户端都是直接调用配置中心的server端来获取配置文件信息。如果server端要做集群，客户端只能通过原始的方式来路由，server端改变IP地址的时候，客户端也需要修改配置，不符合springcloud服务治理的理念。springcloud提供了这样的解决方案，我们只需要将server端当做一个服务注册到eureka中，client端去eureka中去获取配置中心server端的服务既可。
一、Server端改造
1.添加依赖
在SpringCloudConfigServer项目中，添加spring-cloud-starter-netflix-eureka-client引用。
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
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<?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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>SpringCloudConfigServer</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name>SpringCloudConfigServer</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR2</spring-cloud.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-config-server</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-tomcat</artifactId> <scope>provided</scope> </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>
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2.增加了eureka注册中心的配置
在application.properties中增加eureka注册中心的配置，http://localhost:8088是后面启动的eureka server的地址
eureka.client.serviceUrl.defaultZone=http://localhost:8088/eureka/
3.增加注解
在main方法中增加@EnableDiscoveryClient注解
二、客户端改造
1、添加依赖
也是引入spring-cloud-starter-netflix-eureka-client。
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
<?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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>SpringCloudConfigClient</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name>SpringCloudConfigClient</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR2</spring-cloud.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-config</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</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-tomcat</artifactId> <scope>provided</scope> </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>
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2.配置文件
在bootstrap.properties中去掉指定配置服务的地址url，增加了最后的三个配置：
spring.cloud.config.name=neo-config spring.cloud.config.profile=dev spring.cloud.config.label= spring.cloud.config.discovery.enabled=true spring.cloud.config.discovery.serviceId=spring-cloud-config-server eureka.client.serviceUrl.defaultZone=http://localhost:8088/eureka/
spring.cloud.config.discovery.enabled ：开启Config服务发现支持
spring.cloud.config.discovery.serviceId ：指定server端的name,也就是server端spring.application.name的值
eureka.client.serviceUrl.defaultZone ：指向注册中心的地址
3.启动类增加注解
在main方法中增加注解@EnableDiscoveryClient。
三、测试
1.分别启动eureka server、SpringCloudConfigServer、SpringCloudConfigClient。
2.浏览器输入http://localhost:8088/，可以看到注入到eureka server中的服务。
3.输入http://localhost:8001/neo-config/dev，可以看到配置文件的配置信息。
4.输入http://localhost:8002/hello，可以读取到配置文件的属性信息
参考：http://www.ityouknow.com/springcloud/2017/05/25/springcloud-config-eureka.html
