简介

通过config组件，可以将各个微服务的配置存放于git、gitee或者本地文件，并且可以配合bus组件，当修改远程配置文件后，不需要挨个重启部署相关服务，本篇介绍config的引入，和微服务如何读取远程配置；

前置内容：
SpringCloud极简入门＞链路追踪#zipkin

实战

远程配置文件地址：https://gitee.com/catface7/spring-cloud-config/blob/main/dev/server-order-dev.yml；
注意，如果是《server-order》服务的配置，则git上的配置文件必须以“server-order”开头；

1、创建《server-config》服务

1.1、pom配置

<?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>cc.catface</groupId>
        <artifactId>simple-eureka</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>server-config</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>server-account</name>
    <description>Demo project for Spring Boot</description>
    
    <properties>
        <java.version>1.8</java.version>
    </properties>
    
    <dependencies>
        <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-web</artifactId>
        </dependency>

		<!--添加config-server依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
    </dependencies>
</project>

1.2、application添加注解

@SpringBootApplication@EnableEurekaClient@EnableConfigServer//支持config组件

1.3、application.yml配置

server:port:8050eureka:client:service-url:defaultZone: http://localhost:7000/eureka/spring:application:name: server-configcloud:config:server:git:#配置文件所在gituri: https://gitee.com/catface7/spring-cloud-config.git#配置文件所在目录search-paths: devusername: catface7password:******default-label: main#git分支label: main

1.4、验证《server-config》服务

• 访问http://localhost:8050/version/dev，有返回

    {"name":"version","profiles":["dev"],"label":null,"version":"a8edb84950bfb2ef565928b9638adf820ae84181","state":null,"propertySources":[]}

• 访问http://localhost:8050/server-order/dev，有返回配置信息

    {"name":"server-order","profiles":["dev"],"label":null,"version":"a8edb84950bfb2ef565928b9638adf820ae84181","state":null,"propertySources":[{"name":"https://gitee.com/catface7/spring-cloud-config.git/dev/server-order-dev.yml","source":{"data.env":"dev123","data.user.username":"catface","data.user.password":"root"}}]}

至此，《server-config》就可以读取git上的配置信息了；

2、在《server-order》中读取《server-config》拉取的git配置

2.1、《server-order》添加pom依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-config</artifactId>
</dependency>

2.2、新增bootstrap.yml

• application.yml

  server:port:7002spring:application:name: server-orderzipkin:base-url: http://localhost:9411

• bootstrap.yml

  eureka:client:service-url:defaultZone: http://localhost:7000/eureka/#读取server-config服务上当前服务的git配置spring:cloud:config:label: mainprofile: devdiscovery:enabled:trueservice-id: server-config

2.3、代码中分别通过@Value和@ConfigurationProperties实例化配置内容

推荐使用@ConfigurationProperties方式读取配置；

• @Value

  @ComponentpublicclassGitConfig{//toString@Value("${data.env}")privateString env;@Value("${data.user.username}")privateString username;@Value(("${data.user.password}"))privateString password;}

• @ConfigurationProperties
  如果字段没有setter方法，读取为null；

  @Component@ConfigurationProperties(prefix="data")//配置项前缀publicclassGitAutoRefreshConfig{//setter&getter&toStringprivateString env;privateUser user;publicstaticclassUser{privateString username;privateString password;}}

2.4、添加测试接口

@RestController@RefreshScopepublicclassGitConfigController{//测试@Value方式读取配置@GetMapping("testCfg")publicStringtestCfg(){return"testCfg--"+newDate().toLocaleString();}@AutowiredprivateGitConfig gitConfig;@GetMapping("cfgV")publicStringcfgV(){return gitConfig.toString();}//测试@ConfigurationProperties方式读取配置@AutowiredprivateGitAutoRefreshConfig gitAutoRefreshConfig;@GetMapping("cfgP")publicStringcfgP(){return gitAutoRefreshConfig.toString();}}

2.5、请求查看配置

总结

在git上创建了yml配置文件，新增《server-config》服务作为读取git配置的服务端，其他client通过读取《server-config》获取对应的配置；