Nacos如何做config配置中心

小咪咪 2022-10-27 05:21 153阅读 0赞

项目地址请到gitee下载查看[https://gitee.com/xwb1056481167/spring-cloud][https_gitee.com_xwb1056481167_spring-cloud]

nacos的搭建配置请到[https://blog.csdn.net/www1056481167/article/details/113612177][https_blog.csdn.net_www1056481167_article_details_113612177]

## Nacos做配置中心 ##

> nacos替代了springCloud的config,在项目初始化时，要保证先从配置中心进行配置拉取，拉取配置之后，才能保证项目的正常启动。 springboot中配置稳健的加载优先顺序为，bootstrap优先级高于application。  
> 以前是通过config去github上拉去配置，现在nacos自己封装了一套，直接去nacos里面读取配置信息即可

配置中心cloudalibaba-config-nacos-client3377

1、pom.xml

<dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
    </dependency>
    
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>

2、配置规则  
配置规则官网说明: [https://nacos.io/zh-cn/docs/quick-start-spring-cloud.html][https_nacos.io_zh-cn_docs_quick-start-spring-cloud.html]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d3dzEwNTY0ODExNjc_size_16_color_FFFFFF_t_70][]

表达式规则:  
**\\$\{spring.application.name\}-\\$\{spring.profile.active\}.\\$\{spring.nacos.config.file-extension\}**

2.1、 bootstrap.yml

server:
          port: 3377
        spring:
          application:
            name: nacos-config-client
          cloud:
            nacos:
              discovery:
                server-addr: localhost:8848 #nacos服务注册中心地址
              config:
                server-addr: localhost:8848 #nacos作为配置中心地址
                file-extension: yaml #指定yaml格式的配置

2.2、 application.yml

spring:
          profiles:
            active: dev

3、主启动类

@SpringBootApplication
    @EnableDiscoveryClient
    public class NacosConfigClientMain3377 {
        public static void main(String[] args) {
            SpringApplication.run(NacosConfigClientMain3377.class, args);
        }
    }

4、controller

@RestController
    @Slf4j
    @RefreshScope //支持nacos的动态刷新功能
    public class ConfigClientController {
        @Value("\${config.info}")
        private String configInfo;
        @Value("\${server.port}")
        private String serverPort;
    
        @GetMapping("configInfo")
        public String getConfigInfo() {
            return "serverPort: " + serverPort + "\\t\\n\\n configInfo: " + configInfo;
        }
    }

@RefreshScope 该注解谨记一定要添加，动态刷新nacos配置被修改的最新配置信息

访问  
1、在nacos中创建上面配置的**nacos-config-client-dev.yaml**文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d3dzEwNTY0ODExNjc_size_16_color_FFFFFF_t_70 1][]

1、访问 [http://localhost:3377/configInfo][http_localhost_3377_configInfo]  
2、效果图

![20210203170136966.png][]

修改nacos的配置文件，实时刷新后会自动刷新到最新的配置信息

[https_gitee.com_xwb1056481167_spring-cloud]: https://gitee.com/xwb1056481167/spring-cloud
[https_blog.csdn.net_www1056481167_article_details_113612177]: https://blog.csdn.net/www1056481167/article/details/113612177
[https_nacos.io_zh-cn_docs_quick-start-spring-cloud.html]: https://nacos.io/zh-cn/docs/quick-start-spring-cloud.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d3dzEwNTY0ODExNjc_size_16_color_FFFFFF_t_70]: /images/20221024/15e719a302b74625a2c6473ede395fb4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d3dzEwNTY0ODExNjc_size_16_color_FFFFFF_t_70 1]: /images/20221024/bcbfa5249c09406d9d40a5fae55aa27c.png
[http_localhost_3377_configInfo]: http://localhost:3377/configInfo
[20210203170136966.png]: /images/20221024/8e6f879be62c41dd98d97a962ad47179.png