Eclipse配置运行SpringCloud（Hoxton + 2.2.4）微服务框架 + 高可用的分布式配置中心Spring Cloud Config

简介

Spring Cloud Config 是用来为分布式系统中的基础设施和微服务应用提供集中化的外部配置支持，它分为服务端ConfigServer与客户端ConfigClient两个部分。其中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，用来连接配置仓库并为客户端提供获取配置信息、加密 / 解密信息等访问接口；而客户端则是微服务架构中的各个微服务应用或基础设施，它们通过指定的配置中心来管理应用资源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。Spring Cloud Config 实现了对服务端和客户端中环境变量和属性配置的抽象映射，所以它除了适用于 Spring 构建的应用程序之外，也可以在任何其他语言运行的应用程序中使用。由于 Spring Cloud Config 实现的配置中心默认采用 Git 来存储配置信息，所以使用 Spring Cloud Config 构建的配置服务器，天然就支持对微服务应用配置信息的版本管理，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。

服务端配置 Config Server（高可用）

添加依赖包文件POM.xml

  4.0.0
  
    com.springcloud
    springcloud-root
    0.0.1-SNAPSHOT
  
  springcloud-config-server
  springcloud-config-server
  http://maven.apache.org
  
    UTF-8
  
  
    
      org.springframework.cloud
      spring-cloud-config-server
    
    
      org.springframework.boot
      spring-boot-starter-web
    
    
      org.springframework.cloud
      spring-cloud-starter-netflix-eureka-client
    
    
      org.springframework.boot
      spring-boot-starter-test
      test
    
    
      junit
      junit
      3.8.1
      test
    
  
  
    
      
        org.springframework.boot
        spring-boot-maven-plugin
      
    
  

配置application.yml文件

• application.yml

spring:
  application:
    name: springcloud-config-server
  freemarker:
    prefer-file-system-access: false
  security:
    user:
      name: admin
      password: 123456
  cloud:
    config:
      # 配置仓库的分支
      label: master
      server:
        git:
          # 配置git仓库地址
          # uri: [email protected]/springcloud-config.git
          uri: file:E:/SpringBoot/SpringCloud/springcloud-root/springcloud-config
          # 配置仓库路径
          search-paths: config-file
          # 访问git仓库的用户名
          username: zhaojq
          # 访问git仓库的用户密码
          password: 123456

server:
  port: 8130

eureka:
  instance:
    hostname: eureka-config-server.com
    instance-id: eureka-config-server
  client:
    service-url:
      defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/

修改C:\Windows\System32\drivers\etc\hosts

127.0.0.1 eureka-config-server.com

配置本地Git仓库

下载安装git服务
https://git-scm.com/

git bash配置：

git config --global user.name "zhaojq" 
git config --global user.email "[email protected]"
git config --global user.password "123456"

创建git本地库

• application-test.properties
  测试环境配置文件
  

• application-dev.properties
  开发环境配置文件
  

• application-pro.properties
  正式环境配置文件
  

添加Config Server启动类

• ConfigServerApplication.java

在启动类加上@EnableConfigServer注解

package org.springcloud.config.server;

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

@EnableConfigServer
@SpringBootApplication
public class ConfigServerApplication {

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

测试Config Server

启动项目springcloud-config-server

http请求地址和资源文件映射如下:

• /{application}/{profile}[/{label}]
• /{application}-{profile}.yml
• /{label}/{application}-{profile}.yml
• /{application}-{profile}.properties
• /{label}/{application}-{profile}.properties

访问地址 http://eureka-config-server.com:8130/application/test/master

访问地址 http://eureka-config-server.com:8130/application-test.yml

访问地址 http://eureka-config-server.com:8130/master/application-test.yml

访问地址 http://eureka-config-server.com:8130/application-test.properties

访问地址 http://eureka-config-server.com:8130/master/application-test.properties

访问地址 http://eureka-config-server.com:8130/master/test

证明配置服务中心可以获取配置信息。

客户端配置 Config Client

添加依赖包文件POM.xml

  4.0.0
  
    com.springcloud
    springcloud-root
    0.0.1-SNAPSHOT
  
  springcloud-config-client
  springcloud-config-client
  http://maven.apache.org
  
    UTF-8
  
  
    
      org.springframework.cloud
      spring-cloud-starter-config
    
    
      org.springframework.boot
      spring-boot-starter-web
    
    
      org.springframework.cloud
      spring-cloud-starter-netflix-eureka-client
    
    
      org.springframework.boot
      spring-boot-starter-test
      test
    
    
      junit
      junit
      3.8.1
      test
    
  

配置bootstrap.yml文件

spring:
  application:
    name: springcloud-config-client
  freemarker:
    prefer-file-system-access: false
  security:
    user:
      name: admin
      password: 123456
  profiles:
    #读取测试环境配置文件
    #active: test
    #读取开发环境配置文件
    #active: dev
    #读取正式环境配置文件
    active: pro    
  cloud:
    config:
      label: master
      fail-fast: true
      #指明配置服务中心的网址
      uri: http://eureka-config-server.com:8130

server:
  port: 8131

eureka:
  instance:
    hostname: eureka-config-client.com
    instance-id: eureka-config-client
  client:
    service-url:
      defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/

测试Config Client

启动项目springcloud-config-client

Config Client成功向Config Server读取了正式环境配置文件。

客户端配置 Config Client（高可用）

参考https://blog.csdn.net/miaodichiyou/article/details/104160284

修改springcloud-eureka-provider项目

依赖包文件POM.xml

  4.0.0
  
    com.springcloud
    springcloud-root
    0.0.1-SNAPSHOT
  
  springcloud-eureka-provider
  springcloud-eureka-provider
  http://maven.apache.org
  
    UTF-8
  
  
    
      org.springframework.cloud
      spring-cloud-starter-config
    
    
      org.springframework.cloud
      spring-cloud-starter-netflix-eureka-server
    
    
      org.springframework.boot
      spring-boot-starter-web
    
    
      org.springframework.boot
      spring-boot-starter-actuator
    
    
      junit
      junit
      3.8.1
      test
    
  

增加bootstrap.yml文件

spring:
  application:
    name: springcloud-eureka-provider
  freemarker:
    prefer-file-system-access: false
  security:
    user:
      name: admin
      password: 123456
  cloud:
    config:
      #profile: dev
      label: master
      fail-fast: true
      #指明配置服务中心的网址
      uri: http://eureka-config-server.com:8130
      #discovery:
        #service-id: springcloud-config-server
        #enabled: true
eureka:
  client:
    service-url:
      defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer1.com:8897/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer2.com:8898/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-peer3.com:8899/eureka/

修改application-provider.yml

• application-provider1.yml

spring:
  cloud:
    config:
      profile: dev

server:
  port: 8001
  
eureka:
  instance:
    hostname: eureka-provider1.com
    instance-id: eureka-provider1

• application-provider2.yml

spring:
  cloud:
    config:
      profile: pro
    
server:
  port: 8002
  
eureka:
  instance:
    hostname: eureka-provider2.com
    instance-id: eureka-provider2

• application-provider3.yml 增加

spring:
  cloud:
    config:
      profile: test

server:
  port: 8003
  
eureka:
  instance:
    hostname: eureka-provider3.com
    instance-id: eureka-provider3

增加文件

• ConfigProviderApplication.java

package org.springcloud.eureka.provider;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class ConfigProviderApplication {

    @Value("${content}")
    String content;

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

    @RequestMapping("/config")
    public String Home(@RequestParam String name) {
        return "Hello "+name+", This is from serverport:" + port+",content="+content;
    }

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

依次启动项目

springcloud-eureka-cluster-peer1
springcloud-eureka-cluster-peer2
springcloud-eureka-cluster-peer3
springcloud-config-server
springcloud-eureka-provider1
springcloud-eureka-provider2
springcloud-eureka-provider3

浏览器访问http://eureka-provider1.com:8001/config?name=zhaojq

浏览器访问http://eureka-provider2.com:8002/config?name=zhaojq

浏览器访问http://eureka-provider3.com:8003/config?name=zhaojq

Feign测试

参考https://blog.csdn.net/miaodichiyou/article/details/104304853

修改下列文件：

• FeignConsumer.java

package org.springcloud.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Component
/*指定这个接口所要调用的提供者服务名称 */
@FeignClient(value = "springcloud-eureka-provider",configuration = FeignConfig.class,fallback = FeignHystrix.class)

public interface FeignConsumer {
    @GetMapping(value = "/hi")
    String sayHiFromEurekaProvider(@RequestParam(value = "name")String name);
    
    @GetMapping(value = "/config")
    String getConfigFromConfigServer(@RequestParam(value = "name")String name);
}

• FeignController.java

package org.springcloud.feign;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/*调用提供者的home方法*/
@RestController
public class FeignController {
    @Autowired
    FeignService feignService;

    @GetMapping("/hi")
    public String hi(@RequestParam(defaultValue = "zhaojq",required = false)String name){
        return feignService.hi(name);
    }
    
    @GetMapping("/config")
    public String config(@RequestParam(defaultValue = "zhaojq",required = false)String name){
        return feignService.config(name);
    }
}

• FeignService.java

package org.springcloud.feign;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class FeignService {
    @Autowired
    FeignConsumer feignConsumer;
    public String hi(String name){
        return feignConsumer.sayHiFromEurekaProvider(name);
    }
    
    public String config(String name){
        return feignConsumer.getConfigFromConfigServer(name);
    }
}

• FeignConsumer.java

package org.springcloud.feign;

import org.springframework.stereotype.Component;

@Component
public class FeignHystrix implements FeignConsumer {

    @Override
    public String sayHiFromEurekaProvider(String name) {
        return "hi,"+name+", use Feign + hystrix, eureka-provider is down!";
    }
    
    @Override
    public String getConfigFromConfigServer(String name) {
        return "hi,"+name+", use Feign + hystrix, eureka-provider is down!";
    }
}

启动springcloud-feign
在命令窗口curl http://eureka-feign.com:8101/config，发现Feign已经实现负载均衡