SpringCloud Config分布式配置中心

分布式系统面临的配置问题

微服务意味着要将单体应用中的业务拆分成一个个子服务,每个服务的粒度相对较小,因此系统中会出现大量的服务.由于每个服务都需要必要的配置信息才能运行,所以一套集中式的、动态的配置管理设施是必不可少的.SpringCloud提供了ConfigServer来解决这个问题,我们每一个服务自己带着一个application.yml,上百个配置文件的管理......

是什么?

SpringCloud Config为微服务架构中的微服务提供集中化的外部配置支持,配置服务器为各个不同微服务应用的所有环境提供了一个中心化的外部配置.

SpringCloud Config分为服务端和客户端两部分

服务端也称为分布式配置中心,它是一个独立的微服务应用,用来连接配置服务器并为客户端提供获取配置信息,加密/解密信息等访问接口

客户端则是通过指定的配置中心来管理应用资源,以及与业务相关的配置内容,并在启动的时候从配置中心获取和加载配置信息配置服务器默认采用git来存储配置信息,这样就有助于对环境配置进行版本管理,并且可以通过git客户端工具来方便的管理和访问配置内容.

SpringCloud Config服务端配置

1.用自己的GitHub账号在GitHub上新建一个名为microservicecloud-config的新Repository

2.由上一步获得SSH协议的git地址:git@github.com:YangXiaoYoung/microservicecloud-config.git

3.在本地硬盘目录上新建git仓库并clone

4.在本地C:\JAVA\mySpringCloud\microservicecloud-config里面新建一个application.yml

spring:
  profiles:
    active:
    - dev
---
spring:
  profiles: dev #开发环境
  application:
    name: microservicecloud-config-young-dev
---
spring:
  profiles: test #测试环境
  application:
    name: microservicecloud-config-young-test
#保存为UTF-8格式

5.将上一步的yml文件推送到GitHub上

6.新建Module模块microservicecloud-config-3344它即为Cloud的配置中心模块

7.POM

<?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">
    <parent>
        <artifactId>microservicecloud</artifactId>
        <groupId>com.young.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-config-3344</artifactId>

    <dependencies>
        <!-- springCloud Config -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <!-- 图形化监控 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- 熔断 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</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>
        </dependency>
        <!-- 热部署插件 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

</project>

8.YML

server:
  port: 3344
spring:
  application:
    name: microservicecloud-config
  cloud:
    config:
      server:
        git:
          uri: https://github.com/YangXiaoYoung/microservicecloud-config.git #GitHub上面的git仓库名字

9.主启动类

package com.young.springcloud;

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


@EnableConfigServer
@SpringBootApplication
public class Config_3344_StartSpringCloudApp {

    public static void main(String[] args) {
        SpringApplication.run(Config_3344_StartSpringCloudApp.class, args);
    }

}

10.测试通过Config微服务是否可以从GitHub上获取配置内容

http://localhost:3344/application-dev.yml

http://localhost:3344/application-test.yml

SpringCloud Config客户端通过Config服务端获得Github上的配置

1.在本地C:\JAVA\mySpringCloud\microservicecloud-config路径下新建文件microservicecloud-config-client.yml

2.microservicecloud-config-client.yml内容

spring:
  profiles:
    active:
    - dev
---
server:
  port: 8201
spring:
  profiles: dev
  application:
    name: microservicecloud-config-client
eureka:
  client:
    service-url:
      defaultZone: http://eureka-dev.com:7001/eureka/
---
server:
  port: 8202
spring:
  profiles: test
  application:
    name: microservicecloud-config-client
eureka:
  client:
    service-url:
      defaultZone: http://eureka-test.com:7001/eureka/

3.将上一步提交到GitHub中

4.新建microservicecloud-config-client-3355

5.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">
    <parent>
        <artifactId>microservicecloud</artifactId>
        <groupId>com.young.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-config-client-3355</artifactId>

    <dependencies>
        <!-- SpringCloud Config客户端 -->
        <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.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</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>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

</project>

6.bootstrap.yml

bootstrap.yml是什么?

spring:
  cloud:
    config:
      name: microservicecloud-config-client #需要从github上读取的资源名称,注意没有yml后缀名
      profile: dev #本次访问的配置项
      label: master
      uri: http://config-3344.com:3344

7.application.yml

spring:
  application:
    name: microservicecloud-config-client

8.编写ConfigClientRest类

package com.young.springcloud.rest;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ConfigClientRest {

    @Value("${spring.application.name}")
    private String applicationName;

    @Value("${eureka.client.service-url.defaultZone}")
    private String eurekaServers;

    @Value("${server.port}")
    private String port;

    @RequestMapping("/config")
    public String getConfig() {
        String str = "applicationName: " + applicationName + "\t eurekaServers:" + eurekaServers + "\t port:" + port;
        System.out.println("str: " + str);
        return "applicationName: " + applicationName + "\t eurekaServers:" + eurekaServers + "\t port:" + port;
    }

}

9.配置主启动类

package com.young.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ConfigClient_3355_StartSpringCloudApp {

    public static void main(String[] args) {
        SpringApplication.run(ConfigClient_3355_StartSpringCloudApp.class, args);
    }

}

SpringCloud Config配置实战

目前情况:

Config服务端配置OK且测试通过,我们可以和config和GitHub进行配置修改并获得内容.
此时我们做一个eureka服务+一个Dept访问的微服务,将两个微服务的配置统一由github获得实现统一配置分布式管理,完成多环境的变更.

1.在本地C:\JAVA\mySpringCloud\microservicecloud-config路径下新建microservicecloud-config-eureka-client.yml和microservicecloud-config-dept-client.yml

microservicecloud-config-eureka-client.yml

spring:
  profiles:
    active:
    - dev
---
server:
  port: 7001 #注册中心占用7001端口,冒号后面必须空格

spring:
  profiles: dev
  application:
    name: microservicecloud-config-eureka-client

eureka:
  instance:
    hostname: eureka7001.com #冒号后面必须要有空格
  client:
    register-with-eureka: false #当前的eureka-server自己不注册进服务列表中
    fetch-registry: false #不通过eureka获取注册信息
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/
---
server:
  port: 7001 #注册中心占用7001端口,冒号后面必须空格

spring:
  profiles: test
  application:
    name: microservicecloud-config-eureka-client

eureka:
  instance:
    hostname: eureka7001.com #冒号后面必须要有空格
  client:
    register-with-eureka: false #当前的eureka-server自己不注册进服务列表中
    fetch-registry: false #不通过eureka获取注册信息
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/

microservicecloud-config-dept-client.yml

spring:
  profiles:
    active:
    - dev
---
server:
  port: 8001

mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.young.springcloud.entities      # 所有Entity别名类所在包
  mapper-locations:
  - classpath:mybatis/mapper/**/*.xml                       # mapper映射文件

spring:
   profiles: dev
   application:
    name: microservicecloud-dept
   datasource:
    type: com.alibaba.druid.pool.DruidDataSource                                                      # 当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver                                                        # mysql驱动包
    url: jdbc:mysql://localhost:3306/cloudDB01?useUnicode=true&characterEncoding=UTF-8                # 数据库名称
    username: root
    password:
    dbcp2:
      min-idle: 5                                           # 数据库连接池的最小维持连接数
      initial-size: 5                                       # 初始化连接数
      max-total: 5                                          # 最大连接数
      max-wait-millis: 200                                  # 等待连接获取的最大超时时间

eureka:
  client: #客户端注册进eureka服务列表中
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/
  instance:
    instance-id: microservicecloud-dept8001 #自定义服务名称信息
    prefer-ip-address: true #访问路径可以显示IP地址

info:
  app.name: young-microservicecloud
  company.name: www.young.com
  build.artifactId: ${project.artifactId}
  build.version: ${project.version}
---
server:
  port: 8001

mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.young.springcloud.entities      # 所有Entity别名类所在包
  mapper-locations:
  - classpath:mybatis/mapper/**/*.xml                       # mapper映射文件

spring:
   profiles: test
   application:
    name: microservicecloud-dept
   datasource:
    type: com.alibaba.druid.pool.DruidDataSource                                                      # 当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver                                                        # mysql驱动包
    url: jdbc:mysql://localhost:3306/cloudDB02?useUnicode=true&characterEncoding=UTF-8                # 数据库名称
    username: root
    password:
    dbcp2:
      min-idle: 5                                           # 数据库连接池的最小维持连接数
      initial-size: 5                                       # 初始化连接数
      max-total: 5                                          # 最大连接数
      max-wait-millis: 200                                  # 等待连接获取的最大超时时间

eureka:
  client: #客户端注册进eureka服务列表中
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/
  instance:
    instance-id: microservicecloud-dept8001 #自定义服务名称信息
    prefer-ip-address: true #访问路径可以显示IP地址

info:
  app.name: young-microservicecloud
  company.name: www.young.com
  build.artifactId: ${project.artifactId}
  build.version: ${project.version}

2.新建工程microservicecloud-config-eureka-client-7001

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">
    <parent>
        <artifactId>microservicecloud</artifactId>
        <groupId>com.young.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-config-eureka-client-7001</artifactId>

    <dependencies>
        <!-- SpringCloudConfig配置 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <!-- 热部署插件 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

</project>

bootstrap.yml

spring: 
  cloud: 
    config: 
      name: microservicecloud-config-eureka-client     #需要从github上读取的资源名称，注意没有yml后缀名
      profile: dev 
      label: master 
      uri: http://config-3344.com:3344      #SpringCloudConfig获取的服务地址

application.yml

spring:
  application:
    name: microservicecloud-config-eureka-client

主启动类:

package com.young.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer //EurekaServer服务器端启动类,接受其它微服务注册进来
public class Config_Git_EurekaServerApplication {

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

}

3.新建工程microservicecloud-config-dept-client-8001

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">
    <parent>
        <artifactId>microservicecloud</artifactId>
        <groupId>com.young.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-config-dept-client-8001</artifactId>

    <dependencies>
        <!-- SpringCloudConfig配置 -->
        <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.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>com.young.springcloud</groupId>
            <artifactId>microservicecloud-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</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>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

</project>

bootstrap.yml

spring:
  cloud:
    config:
      name: microservicecloud-config-dept-client #需要从github上读取的资源名称，注意没有yml后缀名
      #profile配置是什么就取什么配置dev or test
      profile: dev
      #profile: test
      label: master
      uri: http://config-3344.com:3344  #SpringCloudConfig获取的服务地址

application.yml

spring:
  application:
    name: microservicecloud-config-dept-client

主启动类:

package com.young.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient //本服务启动后会自动注册进eureka服务中
@EnableDiscoveryClient //服务发现
public class DeptProvider8001_Config_App
{
    public static void main(String[] args)
    {
        SpringApplication.run(DeptProvider8001_Config_App.class, args);
    }
}

Controller:

package com.young.springcloud.controller;

import java.util.List;

import com.young.springcloud.entities.Dept;
import com.young.springcloud.service.DeptService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class DeptController
{
    @Autowired
    private DeptService service;
    @Autowired
    private DiscoveryClient client;

    @RequestMapping(value = "/dept/add", method = RequestMethod.POST)
    public boolean add(@RequestBody Dept dept)
    {
        return service.add(dept);
    }

    @RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
    public Dept get(@PathVariable("id") Long id)
    {
        return service.get(id);
    }

    @RequestMapping(value = "/dept/list", method = RequestMethod.GET)
    public List<Dept> list()
    {
        return service.list();
    }

    
//  @Autowired
//  private DiscoveryClient client;
    @RequestMapping(value = "/dept/discovery", method = RequestMethod.GET)
    public Object discovery()
    {
        List<String> list = client.getServices();
        System.out.println("**********" + list);

        List<ServiceInstance> srvList = client.getInstances("MICROSERVICECLOUD-DEPT");
        for (ServiceInstance element : srvList) {
            System.out.println(element.getServiceId() + "\t" + element.getHost() + "\t" + element.getPort() + "\t"
                    + element.getUri());
        }
        return this.client;
    }

}

Dao:

package com.young.springcloud.dao;

import java.util.List;

import com.young.springcloud.entities.Dept;
import org.apache.ibatis.annotations.Mapper;


@Mapper
public interface DeptDao
{
    public boolean addDept(Dept dept);

    public Dept findById(Long id);

    public List<Dept> findAll();
}

Service:

package com.young.springcloud.service;

import com.young.springcloud.entities.Dept;

import java.util.List;


public interface DeptService
{
    public boolean add(Dept dept);

    public Dept get(Long id);

    public List<Dept> list();
}

package com.young.springcloud.service.impl;

import java.util.List;

import com.young.springcloud.dao.DeptDao;
import com.young.springcloud.entities.Dept;
import com.young.springcloud.service.DeptService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;



@Service
public class DeptServiceImpl implements DeptService
{
    @Autowired
    private DeptDao dao;
    
    @Override
    public boolean add(Dept dept)
    {
        return dao.addDept(dept);
    }

    @Override
    public Dept get(Long id)
    {
        return dao.findById(id);
    }

    @Override
    public List<Dept> list()
    {
        return dao.findAll();
    }

}

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