SpringCloud创建Config Client配置读取
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: 8001
spring:
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-dev
config:
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
8.测试服务
访问Config Client提供的Rest服务:
http://localhost:8001/configInfo
修改bootstrap.yml中spring.cloud.config.profile为dev,
然后重新启动,再次访问上面的接口:
可以看到两次分别拉取到了config-client-demo.yml中对应的配置。
9.参考文章
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