SpringCloud Config 用于集中管理各个微服务中的配置信息，支持使用 Git 管理配置文件，下面就实践一下，准备一个 Git 仓库，用于存放配置文件，创建一个Config Server，连接这个Git仓库，然后修改 employee-producer，从 Config Server 读取配置文件。

准备Git仓库

在仓库的根目录下新建一个目录 config-repo，在其中创建一个配置文件 employee-producer.properties

from=git-default-1

提交推送到服务器。

创建 Config Server

新建 springboot 项目 employee-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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>employee-config-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>employee-config-server</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.17.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Edgware.SR5</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.6</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.6</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.6</version>
        </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>

启动类中开启 config server

@SpringBootApplication
@EnableConfigServer
public class EmployeeConfigServerApplication {

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

application.properties

spring.application.name=config-server    
server.port=7001    
spring.cloud.config.server.git.uri=https://gitee.com/xxx/springcloud-config
spring.cloud.config.server.git.searchPaths=config-repo    
spring.cloud.config.server.git.username=xxx   
spring.cloud.config.server.git.password=xxx

启动，访问 http://localhost:7001/employee-producer/dev/master，正常的话就会显示一段JSON数据，包含配置文件的内容。

修改 employee-producer

添加依赖：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-config</artifactId>
</dependency>

新建 bootstrap.properties

spring.application.name=employee-producer
server.port=7002
spring.cloud.config.profile=default
spring.cloud.config.label=master
spring.cloud.config.uri=http://localhost:7001/

吧 application.properties 中的 spring.application.name 注释掉。

TestController 中添加：

    @Value("${from}")
    private String hello;

    @RequestMapping("/hello")
    public String from() {
        return this.hello;
    }

重新启动，访问 http://localhost:8070/hello，会输出配置文件中的值 git-default-1。