SpringCloud创建Config Client配置读取

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

1.说明

本文详细介绍配置中心客户端使用方法，
即Config Client到Config Server读取配置，
这里以创建Config Client服务为例，
基于已经创建好的Config Server模块，
请参考SpringCloud创建Config模块,
到配置中心读取配置。

2.创建工程，添加依赖

在父工程下面创建一个Maven模块config-client，
在pom.xml中增加config client的依赖：

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

其中spring-boot-starter-web是spring boot应用，
可以对外提供Rest服务，
下面会通过Rest接口查询客户端读取到的配置。

3.新增配置文件

新增配置文件bootstrap.yml:

server: port: 8001spring: application: name: config-client cloud: config: label: master name: config-client-demo profile: test uri: http://localhost:9009

上面的spring.cloud.config配置,
指定了配置中心http://localhost:9009，
拉取master分支下的config-client-demo.yml中的test配置。

4.git仓库增加配置

由于http://localhost:9009配置中心，
指定了spring-cloud-config仓库的地址：

https://gitee.com/bugzeroman/spring-cloud-config.git

需要把config-client-demo.yml上传到仓库，
这样客户端才能通过配置中心拉取到配置文件。
config-client-demo.yml内容：

spring: profiles: active: - test--- # 开发环境 spring: profiles: dev application: name: config-server-devconfig: info: config info dev--- # 测试环境 spring: profiles: test application: name: config-server-test config: info: config info test

5.新增查询接口

ConfigClientController.java对外提供config.info参数的查询，
config.info是从配置中心读取的。

package com.yuwen.spring.config.client.controller;import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController;@RestController public class ConfigClientController { @Value("${config.info}") private String configInfo; @GetMapping("/configInfo") public String getConfigInfo() { return configInfo; } }

6.新增启动类

主启动类ConfigClientApplication.java，
只要加上SpringBootApplication注解：

package com.yuwen.spring.config.client;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication public class ConfigClientApplication { public static void main(String[] args) { SpringApplication.run(ConfigClientApplication.class, args); } }

7.启动服务

Config Client服务启动日志如下，
注意要先启动Config Server服务：

. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.3.1.RELEASE)2020-09-11 15:59:00.454 INFO 19236 --- [ main] c.c.c.ConfigServicePropertySourceLocator : Fetching config from server at : http://localhost:9009 2020-09-11 15:59:01.868 INFO 19236 --- [ main] c.c.c.ConfigServicePropertySourceLocator : Located environment: name=config-client-demo, profiles=[dev], label=master, version=befaf0fdb3897ac7b7de2a8df3192decb0192cb7, state=null 2020-09-11 15:59:01.869 INFO 19236 --- [ main] b.c.PropertySourceBootstrapConfiguration : Located property source: [BootstrapPropertySource {name='bootstrapProperties-configClient'}, BootstrapPropertySource {name='bootstrapProperties-https://gitee.com/bugzeroman/spring-cloud-config.git/config-client-demo.yml (document #1)'}, BootstrapPropertySource {name='bootstrapProperties-https://gitee.com/bugzeroman/spring-cloud-config.git/application.yml (document #1)'}, BootstrapPropertySource {name='bootstrapProperties-https://gitee.com/bugzeroman/spring-cloud-config.git/config-client-demo.yml (document #0)'}, BootstrapPropertySource {name='bootstrapProperties-https://gitee.com/bugzeroman/spring-cloud-config.git/application.yml (document #0)'}] 2020-09-11 15:59:01.874 INFO 19236 --- [ main] c.y.s.c.client.ConfigClientApplication : No active profile set, falling back to default profiles: default 2020-09-11 15:59:02.239 INFO 19236 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=7db33b17-4254-3471-a240-faf5a3bf9fa9 2020-09-11 15:59:02.660 INFO 19236 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8001 (http) 2020-09-11 15:59:02.668 INFO 19236 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2020-09-11 15:59:02.668 INFO 19236 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.36] 2020-09-11 15:59:02.750 INFO 19236 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2020-09-11 15:59:02.750 INFO 19236 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 865 ms 2020-09-11 15:59:02.847 INFO 19236 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor' 2020-09-11 15:59:03.248 INFO 19236 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8001 (http) with context path '' 2020-09-11 15:59:03.531 INFO 19236 --- [ main] c.y.s.c.client.ConfigClientApplication : Started ConfigClientApplication in 4.184 seconds (JVM running for 4.49) 2020-09-11 15:59:30.056 INFO 19236 --- [nio-8001-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet' 2020-09-11 15:59:30.056 INFO 19236 --- [nio-8001-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet' 2020-09-11 15:59:30.060 INFO 19236 --- [nio-8001-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 4 ms