Nacos Config使用，从nacos读取配置文件讲解

骑猪看日落 2021-09-07 06:06 3484阅读 0赞

使用Nacos Config的好处：配置的生效是实时的，不需要重启或刷新

1、添加依赖

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

2、复制已经配置好的yml配置代码，复制后将本代码注释掉即可，如下图所示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 1][]

server:
      port: 8081
    spring:
      zipkin:
        base-url: http://127.0.0.1:9411/  #zipkin server的请求地址
        discoveryClientEnabled: false #让nacos把它当成一个URL，而不要当做服务名
      sleuth:
        sampler:
          probability: 1.0  #采样的百分比
      application:
        name: service-product
      datasource:
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql:///shop?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
        username: root
        password: root
      jpa:
        properties:
          hibernate:
            hbm2ddl:
              auto: update
            dialect: org.hibernate.dialect.MySQL5InnoDBDialect
      cloud:
        nacos:
          discovery:
            server-addr: 127.0.0.1:8848

然后打开nacos服务UI界面，点击右边的加号，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 2][]

将复制的配置代码添加到配置内容里面，选择好自己使用的后缀名，Data ID：命名规则下面详细介绍，不能随便写，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 3][]

然后引用nacos配置的配置文件

注意:不能使用原来的application.yml作为配置文件，而是新建一个bootstrap.yml作为配置文件

配置文件优先级(由高到低):  
bootstrap.properties -> bootstrap.yml -> application.properties -> application.yml

这里使用bootstrap.yml级别的，如下图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 4][]

spring:
      application:
        name: service-product
      cloud:
        nacos:
          config:
            server-addr: 127.0.0.1:8848 #nacos中心地址
            file-extension: yaml  # 配置文件格式
      profiles:
        active: dev  # 环境标识

这里介绍Data ID的命名规则:服务名称-开发环境.后缀名拼接起来  
注意  
1、服务名称 后面需要添加一个横杠  
2、开发环境 后面需要添加一个点

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 5][]

然后点下右下角的发布按钮，就保存成功了，如下图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 6][]

启动服务，测试，如下图，成功从nacos读取了配置文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTYxMjI2_size_16_color_FFFFFF_t_70 7][]

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