（二）springcloud 集中配置-spring cloud config

setup a Config Server and then build a client that consumes the configuration on startup and then refreshes the configuration without restarting the client.

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>configuration-service</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.5.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<java.version>1.8</java.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>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Finchley.SR2</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：

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

// use @EnableConfigServer to standup a config server that other applications can talk to
@EnableConfigServer
@SpringBootApplication
public class ConfigServiceApplication {

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

配置：

server:
  port: 8888
spring:
  application:
    name: config-server
  cloud:
    config:
      server:
      	# 也可以指向本地库：file://${user.home}/config-repo
        git:
          uri: https://gitee.com/lostNfound/spring-cloud-config.git
          username: 18507149951
          password: xxxx
          searchPaths: /**
          default-label: master
        # 也可以使用本地配置
       	# native:
          # search-locations: classpath:config/*

配置管理：EnvironmentRepository

Environment资源由三个变量确定

• {application}映射到客户端的“spring.application.name”;
• {profile}映射到客户端上的“spring.profiles.active”（逗号分隔列表）; 和
• {label}这是一个服务器端功能，标记“版本”的一组配置文件。

测试：

1、git仓库中创建配置文件：config-client-example-dev.yml

value: config-client-example-value

2、启动集中配置，访问：http://localhost:8888/config-client-dev.yml

/**
 * 配置访问方式：
 * /{application}/{profile}[/{label}]
 * /{application}-{profile}.yml
 * /{label}/{application}-{profile}.yml
 * /{application}-{profile}.properties
 * /{label}/{application}-{profile}.properties
 */

config client

<?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>configuration-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.5.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Finchley.SR2</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>

配置(bootstrap.yml)：

server:
  port: 4001

spring:
  application:
  	# 指定服务名称
    name: config-client-example
  profiles:
    active: dev

  cloud:
    config:
    	# 指定label
      label: master
      # 指定服务名称
      profile: ${spring.profiles.active}
      # 指定集中配置服务名称和是否开启
      discovery:
        service-id: config-server
        enabled: true

# 开放监控端点，动态刷新配置
management:
  endpoints:
    web:
      exposure:
        include: "*"

启动类：

@SpringBootApplication
public class ConfigClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConfigClientApplication.class, args);
    }
  
  	/**
     * 验证从配置中心获取配置
     */
    @RefreshScope
    @RestController
    @RequestMapping("/config")
    public class ConfigController {

        @Value("${value}")
        private String value;

        @GetMapping("/param")
        public String param() {
            return value;
        }
    }
  
}

启动验证：

启动并访问：http://localhost:4001/config/param

响应结果：config-client-example-value

修改配置文件：

value: config-client-example-value edit

向客户端发送请求，到集中配置抓取最新配置

POST /actuator/refresh HTTP/1.1
Content-Length: 0
Host: localhost:4001
Content-Type: application/json

HTTP/1.1 200
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Mon, 22 Apr 2019 05:12:24 GMT

["config.client.version","value"]

再次访问：http://localhost:4001/config/param

响应结果：config-client-example-value edit

详细配置

spring:
	cloud:
		config:
			# 找不到配置停止启动并显示异常
			fail-fast: true
			# 配置读取超时
			request-read-timeout: 1s
			server:
				git:
					# 指定git仓库地址
					url: https://gitee.com/lostNfound/spring-cloud-config.git
					# 可以使用占位符来支付每一个服务一个配置库
					# url: https://gitee.com/lostNfound/{application}.git
					skipSslValidation: true
					timeout: 4
					username: xxx
					password: xxx

**除了git，文件系统外，集中配置还支持 Vault Backend, JDBC Backend, CredHub Backend。不写了 **