本地文件系统

不要在中大型云应用程序中使用基于文件系统的解决方案！

使用文件系统方法，意味着要为想要访问应用程序配置数据的所有 Config 服务器端实现共享文件挂载点。

1. 修改 application.yml

在 application.yml 文件中增加相关配置信息，包括:

• spring.profiles.active=native

• spring.cloud.config.server.native.search-locations=classpath:/config

server:
  port: 8071
spring:
  application:
    name: config-server
  profiles:
    active: native
  cloud:
    config:
      server:
        native:
          search-locations: classpath:/config

classpath 属性使得 Spring Cloud Config 服务器端在 src/main/resources/config 文件夹中查找配置数据。

2. 创建服务的配置文件

为以下 3 个环境创建应用程序配置数据：默认环境、开发环境和生产环境。

应用程序配置文件的命名约定是“应用程序名称-环境名称.properties”或“应用程序名称-环境名称.yml”。环境名称由在服务启动时命令行传入的 Spring Boot 的 profile 指定。

在 src/main/resources/config 文件夹分别创建了三个文件：

• license-service.yml：

  management:
    endpoints:
      web:
        base-path: /actuator
  server:
    port: 8080
  spring:
    web:
      locale: zh
      locale-resolver: accept_header

• license-service-dev.yml：

  management:
    endpoints:
      web:
        exposure:
          include: '*'
      jmx:
        exposure:
          include: '*'
  # springdoc-openapi项目配置
  springdoc:
    swagger-ui:
      path: /swagger-ui.html
      tags-sorter: alpha
      operations-sorter: alpha
    api-docs:
      path: /v3/api-docs
    group-configs:
      - group: 'default'
        paths-to-match: '/**'
        packages-to-scan: com.study.cloudlearning.controller
  # knife4j的增强配置，不需要增强可以不配
  knife4j:
    enable: true
    setting:
      language: zh_cn

• license-service-prod.yml：

  management:
    endpoints:
      web:
        exposure:
          include: health
      jmx:
        exposure:
          exclude: '*'
  springdoc:
    api-docs:
      enabled: false
    swagger-ui:
      enabled: false
  knife4j:
    enable: false

3. 启动 Config Server

通过 REST 接口获取不同环境的配置信息：

http://localhost:8071/license-service/default

{
    "name": "cloud-learning",
    "profiles": [
        "default"
    ],
    "label": null,
    "version": null,
    "state": null,
    "propertySources": [
        {
            "name": "classpath:/config/cloud-learning.yml",
            "source": {
                "management.endpoints.web.base-path": "/actuator",
                "server.port": 8080,
                "spring.web.locale": "zh",
                "spring.web.locale-resolver": "accept_header"
            }
        }
    ]
}

http://localhost:8071/license-service/dev

{
    "name": "cloud-learning",
    "profiles": [
        "dev"
    ],
    "label": null,
    "version": null,
    "state": null,
    "propertySources": [
        {
            "name": "classpath:/config/cloud-learning-dev.yml",
            "source": {
                "management.endpoints.web.exposure.include": "*",
                "management.endpoints.jmx.exposure.include": "*",
                "knife4j.enable": true,
                "knife4j.openapi.description": "Swagger接口文档，学习用",
                "knife4j.openapi.title": "Swagger接口文档",
                "knife4j.openapi.group.test.api-rule": "package",
                "knife4j.openapi.group.test.api-rule-resources": "com.study.cloudlearning.controller",
                "knife4j.openapi.group.test.group-name": "测试分组"
            }
        },
        {
            "name": "classpath:/config/cloud-learning.yml",
            "source": {
                "management.endpoints.web.base-path": "/actuator",
                "server.port": 8080,
                "spring.web.locale": "zh",
                "spring.web.locale-resolver": "accept_header"
            }
        }
    ]
}

http://localhost:8071/license-service/prod

{
    "name": "cloud-learning",
    "profiles": [
        "prod"
    ],
    "label": null,
    "version": null,
    "state": null,
    "propertySources": [
        {
            "name": "classpath:/config/cloud-learning-prod.yml",
            "source": {
                "knife4j.enable": false,
                "management.endpoints.web.exposure.include": "health",
                "management.endpoints.jmx.exposure.exclude": "*"
            }
        },
        {
            "name": "classpath:/config/cloud-learning.yml",
            "source": {
                "management.endpoints.web.base-path": "/actuator",
                "server.port": 8080,
                "spring.web.locale": "zh",
                "spring.web.locale-resolver": "accept_header"
            }
        }
    ]
}

仔细观察，会看到在选择 dev 端点时，Spring Cloud Config 服务器端返回的是默认配置和开发环境下的配置。

Spring Cloud Config 返回两组配置信息的原因是：Spring 框架实现了一种用于解决问题的层次结构机制。当 Spring 框架解决问题时，它将先查找默认属性文件中定义的属性，然后用特定环境的值（如果存在）去覆盖默认值。