Config原理解析，项目搭建以及如何获取不同环境下的配置文件信息（一）

原理

搭建config项目

需要两个项目和github仓库

新增github仓库

spring-cloud-config-server

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cx</groupId>
    <artifactId>spring-cloud-config-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-cloud-config-server</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${
    
    spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

yml

eureka:
  ## 表示为Erureka客户端
  client:
    ## 单台server为服务器不需要注册到服务器上
    register-with-eureka: true
    ## 获取注册列表的信息  道理同上 基本两者参数是一样的
    fetch-registry: true
    service-url: # Eureka服务提供地址
      defaultZone: http://node1:10097/eureka/
spring:
  cloud:
    config:
      server: #git仓库的配置
        git:
          uri: https://github.com/cxjwbj/config-test2 # 指定仓库url
          search-paths: config # 当前包下所有文件
          username: cxwbj14@163.com # 账号
          password: qq136 # 密码
  application:
    name: config-server

server:
  port: 7000

启动类

@SpringBootApplication
@EnableEurekaClient
@EnableConfigServer
public class SpringCloudConfigServerApplication {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(SpringCloudConfigServerApplication.class, args);
    }

}

spring-cloud-config-client

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cx</groupId>
    <artifactId>spring-cloud-config-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-cloud-config-client</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${
    
    spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

bootStrap.yml

## bootstrap的优先级大于application 我们要抓取配置信息需在应用启动之前 必须的使用bootstrap

eureka:
  ## 表示为Erureka客户端
  client:
    ## 单台server为服务器不需要注册到服务器上
    register-with-eureka: true
    ## 获取注册列表的信息  道理同上 基本两者参数是一样的
    fetch-registry: true
    service-url: # Eureka服务提供地址
      defaultZone: http://node1:10097/eureka/

spring:
  application:
    name: myConfig # 此处的名字必须和GitHub仓库的配置文件的名字一样
  cloud:
    config:
        uri: http://localhost:7000 # server的uri
        label: master # 不指定也是master分支
server:
  port: 8000

编写config获取对应数据

@Configuration
public class ConfigClientConfig {
    
    

    @Value("${redis.host}")
    private String redisHost;

    @Value("${mysql.host}")
    private String mysqlHost;

    @Value("${mongo.host}")
    private String mongoHost;


    public String getRedisHost() {
    
    
        return redisHost;
    }

    public String getMysqlHost() {
    
    
        return mysqlHost;
    }

    public String getMongoHost() {
    
    
        return mongoHost;
    }
}

编写controller

@RestController
public class MyController {
    
    

    @Autowired
    private ConfigClientConfig configClientConfig;

    @RequestMapping(value = "hosts")
    public String getHosts() {
    
    
        return configClientConfig.getMongoHost() + ", " +
                configClientConfig.getMysqlHost() + ", " +
                configClientConfig.getRedisHost();
    }
}

依次启动 server config-server config-client
//数据缓存到本地git仓库

跟config-server建立连接

此时访问
http://localhost:8000/hosts

获取的配置文件的信息

如何获取的不同环境下的配置文件了？

我们在建个dev下的配置文件

此时在config-client yml文件修改

## bootstrap的优先级大于application 我们要抓取配置信息需在应用启动之前 必须的使用bootstrap

eureka:
  ## 表示为Erureka客户端
  client:
    ## 单台server为服务器不需要注册到服务器上
    register-with-eureka: true
    ## 获取注册列表的信息  道理同上 基本两者参数是一样的
    fetch-registry: true
    service-url: # Eureka服务提供地址
      defaultZone: http://node1:10097/eureka/

spring:
  application:
    name: myConfig # 此处的名字必须和GitHub仓库的配置文件的名字一样
  cloud:
    config:
        uri: http://localhost:7000 # server的uri
        label: master # 不指定也是master分支
        profile: devellop # 此时还会抓取myConfig-develop的配置文件
server:
  port: 8000

此时依次重启对应服务
client加载了对应的配置文件

重新访问http://localhost:8000/hosts 返回数据就发生改变

gitHub和config-client客户端yml对应规则

如：myConfig-devellop.properties

• myConfig：客户端名字
• devellop：yml 文件profile: devellop对应的环境必须是最后一个“-”默认就是myConfig.properties
• label： 就是gitHub分支名默认是master
•