SpringCloud项目(二)：springcloudconfig+eureka+git远程仓库配置文件

作用&＃xff1a;为springcloud config server&＃xff08;服务端&＃xff09;、springcloud config client(客户端)提供统一的注册地址

pom.xml


<project xmlns&＃61;"http://maven.apache.org/POM/4.0.0" xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation&＃61;"http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0modelVersion><parent><groupId>org.springframework.bootgroupId><artifactId>spring-boot-starter-parentartifactId><version>2.2.4.RELEASEversion><relativePath/> parent><groupId>com.examplegroupId><artifactId>eurekazzartifactId><version>0.0.1-SNAPSHOTversion><name>eurekazzname><description>Demo project for Spring Bootdescription><properties><java.version>1.8java.version><spring-cloud.version>Hoxton.SR1spring-cloud.version>properties><dependencies><dependency><groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-starter-netflix-eureka-serverartifactId>dependency><dependency><groupId>org.springframework.bootgroupId><artifactId>spring-boot-starter-testartifactId><scope>testscope><exclusions><exclusion><groupId>org.junit.vintagegroupId><artifactId>junit-vintage-engineartifactId>exclusion>exclusions>dependency>dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-dependenciesartifactId><version>${spring-cloud.version}version><type>pomtype><scope>importscope>dependency>dependencies>dependencyManagement><build><plugins><plugin><groupId>org.springframework.bootgroupId><artifactId>spring-boot-maven-pluginartifactId>plugin>plugins>build>project>


application.yml

#设置tomcat服务端口号
server:port : 8761
spring:application:name: eurekazz
eureka:client:fetch-registry: false #自己就是注册中心&＃xff0c;负责维护服务&＃xff0c;不需要去检索服务register-with-eureka: false #不向注册中心注册自己

启动类

&＃64;SpringBootApplication
&＃64;EnableEurekaServer //开启eureka服务
public class EurekazzApplication {public static void main(String[] args) {SpringApplication.run(EurekazzApplication.class, args);}
}

当控制台出现如下提示&＃xff0c;则可以打开http://localhost:8761/&＃xff0c;就能看到eureka服务页面

1. pom.xml


<project xmlns&＃61;"http://maven.apache.org/POM/4.0.0" xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation&＃61;"http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0modelVersion><parent><groupId>org.springframework.bootgroupId><artifactId>spring-boot-starter-parentartifactId><version>2.1.7.RELEASEversion><relativePath/> parent><groupId>com.examplegroupId><artifactId>configseverartifactId><version>0.0.1-SNAPSHOTversion><name>configsevername><description>Demo project for Spring Bootdescription><properties><java.version>1.8java.version><spring-cloud.version>Greenwich.SR2spring-cloud.version>properties><dependencies><dependency><groupId>org.springframework.bootgroupId><artifactId>spring-boot-starterartifactId>dependency><dependency><groupId>org.springframework.bootgroupId><artifactId>spring-boot-starter-testartifactId><scope>testscope><exclusions><exclusion><groupId>org.junit.vintagegroupId><artifactId>junit-vintage-engineartifactId>exclusion>exclusions>dependency>




<dependency> <groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-starter-eurekaartifactId>dependency><dependency> <groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>dependency><dependency> <groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-starter-netflix-hystrixartifactId>dependency><dependency> <groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-config-serverartifactId><version>2.1.3.RELEASEversion>dependency><dependency><groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-commonsartifactId><version>2.1.2.RELEASEversion>dependency><dependency> <groupId>org.springframework.bootgroupId><artifactId>spring-boot-starter-webartifactId>dependency>dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-dependenciesartifactId><version>${spring-cloud.version}version><type>pomtype><scope>importscope>dependency>dependencies>dependencyManagement><build><plugins><plugin><groupId>org.springframework.bootgroupId><artifactId>spring-boot-maven-pluginartifactId>plugin>plugins>build>project>

2. bootstrap.yml&＃xff08;一般将重要参数放入该文件里&＃xff0c;优先级高&＃xff0c;bootstrap一定会被读取&＃xff08;覆盖application.yml的相同配置&＃xff09;&＃xff09;

server:port: 6666 #端口号
eureka:client:service-url:defaultZone: http://127.0.0.1:8761/eureka #注册到注册中心instance:prefer-ip-address: true #显示ip
spring:application:name: configsever #在注册中心显示的主机名cloud:config:server:git:uri: https://github.com/zz790609619/configRes #github的地址username: 790609619&＃64;qq.com #github的账户名password: xxxxxx #gitHub的密码clone-on-start: true

3. 启动类

package com.example.configsever;import org.springframework.boot.SpringApplication;import org.springframework.cloud.client.SpringCloudApplication;import org.springframework.cloud.config.server.EnableConfigServer;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;&＃64;EnableEurekaClient //加入注册中心
&＃64;SpringCloudApplication
&＃64;EnableConfigServer //启用配置服务端
/*** author : ww*/public class ConfigseverApplication {public static void main(String[] args) {SpringApplication.run(ConfigseverApplication.class, args);}
}


4. 启动结果
   
5. 访问http://localhost:8761/,查看是否注册在eureka上
   
6. 用接口调用软件&＃xff08;postman&＃xff09;访问&＃xff0c;获取到git上面的配置文件即为成功

/{application}/{profile}[/{label}] /{application}-{profile}.yml
/{label}/{application}-{profile}.yml
/{application}-{profile}.properties
/{label}/{application}-{profile}.properties

{application} 就是应用名称&＃xff0c;对应到配置文件上来&＃xff0c;就是配置文件的名称部分&＃xff0c;例如我上面创建的配置文件。
{profile} 就是配置文件的版本&＃xff0c;我们的项目有开发版本、测试环境版本、生产环境版本&＃xff0c;对应到配置文件上来就是以 application-{profile}.yml 加以区分&＃xff0c;例如application-dev.yml、application-sit.yml、application-prod.yml。
{label} 表示 git 分支&＃xff0c;默认是 master 分支&＃xff0c;如果项目是以分支做区分也是可以的&＃xff0c;那就可以通过不同的 label 来控制访问不同的配置文件了

1. pom.xml

<dependencies><dependency><groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-starter-configartifactId>dependency><dependency><groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>dependency><dependency><groupId>org.springframework.cloudgroupId><artifactId>spring-cloud-starter-eurekaartifactId>dependency><dependency><groupId>org.springframework.bootgroupId><artifactId>spring-boot-starter-actuatorartifactId>dependency>dependencies>

2. bootstrap.yml

spring:application:name: configclient #应用名称cloud:config:label: master #分支名discovery:enabled: trueservice-id: configsever # 服务端的spring.application.name 便于从eureka中寻找对应的名字的地址&＃xff0c;以获取git中参数fail-fast: true #快速获取失败profile: master #相同文件名的后缀&＃xff0c;application-dev.yml、application-master.yml
eureka:client:serviceUrl:defaultZone: http://127.0.0.1:8761/eureka/ #注册在eureka

3. 启动类

&＃64;SpringCloudApplication
public class ConfigclientApplication {public static void main(String[] args) {SpringApplication.run(ConfigclientApplication.class, args);}
}

4. 运行项目&＃xff0c;查看控制台的端口号是否和git中一致&＃xff1f;看看eureka是否有当前的服务注册在上面&＃xff1f;
   

补充说明&＃xff1a;

ConfigClient如何获取到git中的文件内容&＃xff1f;

1. configclient注册在eureka中&＃xff0c;通过配置文件中spring.cloud.congfig中discovery.service-id去eureka中获取该id对应的服务端的地址&＃xff08;点击下图标红&＃xff0c;则能获取该服务端的ip&＃43;端口 http://192.168.93.1:6666/&＃xff09;
   
2. 根据配置文件中的label作为参数&＃xff0c;通过步骤1获取的地址去获取git对应label分支中的文件&＃xff0c;作为客户端的配置文件&＃xff0c;如果该分支下有多个文件&＃xff0c;则根据profile去获取对应的版本。

ConfigServer如何与git进行连接&＃xff1f;

1. 项目启动类中通过注解&＃xff08;&＃64;EnableConfigServer&＃xff09;中的ConfigServerConfiguration
   
2. 打开ConfigServerConfiguration&＃xff0c;可以看到只会返回一个marker,查询marker被调用的类
   
3. 找到ConfigServerAutoConfiguration类&＃xff0c;可以看到与config有关的是EnvironmentRepositoryConfiguration类
   
4. 查看import的类则能看到git相关的&＃64;Import({CompositeRepositoryConfiguration.class, JdbcRepositoryConfiguration.class, VaultConfiguration.class, VaultRepositoryConfiguration.class, CredhubConfiguration.class, CredhubRepositoryConfiguration.class, SvnRepositoryConfiguration.class, NativeRepositoryConfiguration.class, *GitRepositoryConfiguration.class*, DefaultRepositoryConfiguration.class})
5. 根据&＃64;Profile({“git”}) 可以获取到配置文件中配置的参数
   
6. 因为GitRepositoryConfiguration继承于DefaultRepositoryConfiguration类&＃xff0c;图中标红的类都实现了EnvironmentRepositoryFactory的方法
7. EnvironmentRepositoryFactory继承与EnvironmentRepository&＃xff0c;EnvironmentRepository中存在一个findone的方法
   
8. 看下方法的参数&＃xff0c;和我们配置文件中的参数有点像&＃xff0c;可以查到ResourceController中有该方法&＃xff0c;可以大概推测Config Server是通过建立一个RestController来接收读取配置请求的&＃xff0c;然后使用EnvironmentRepository来进行配置查询&＃xff0c;返回一个org.springframework.cloud.config.environment.Environment对象的json串&＃xff0c;推测客户端接收时也应该是反序列化为org.springframework.cloud.config.environment.Environment的一个实例
9. 所以client&＃xff08;客户端&＃xff09;从服务端获取序列化的参数&＃xff0c;并且将之反序列化&＃xff0c;作用于自己项目。