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说明：参考

1、Config介绍

在分布式系统中，由于服务数量巨多，为了方便服务配置文件统一管理，实时更新，所以需要分布式配置中心组件。

在spring cloud config 组件中，分两个角色，一是config server，二是config client。

Spring Cloud Config Server最常见是将配置文件存放方式有3种：

（1）本地 （2）远程Git仓库 （3）局域网数据库

本文介绍局域网数据库方式存储配置文件

2、样例

2.1 数据库

(1) 创建数据库实例

MariaDB [(none)]> create database config;Query OK, 1 row affected (0.03 sec)MariaDB [(none)]> use config;Database changedMariaDB [config]>

(2) 创建数据表

MariaDB [config]> CREATE TABLE `config_properties` (    ->   `id` bigint(20) NOT NULL AUTO_INCREMENT,    ->   `key1` varchar(50) COLLATE utf8_bin NOT NULL,    ->   `value1` varchar(500) COLLATE utf8_bin DEFAULT NULL,    ->   `application` varchar(50) COLLATE utf8_bin NOT NULL,    ->   `profile` varchar(50) COLLATE utf8_bin NOT NULL,    ->   `label` varchar(50) COLLATE utf8_bin DEFAULT NULL,    ->   PRIMARY KEY (`id`)    -> ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;Query OK, 0 rows affected (0.00 sec)MariaDB [config]>

(3) 插入数据

MariaDB [config]> insert into `config_properties` (`id`, `key1`, `value1`, `application`, `profile`, `label`) values('1','server.port','8083','config-client','dev','master');'2','foo','bar-jdbc','config-client','dev','master');Query OK, 1 row affected (0.00 sec)MariaDB [config]> insert into `config_properties` (`id`, `key1`, `value1`, `application`, `profile`, `label`) values('2','foo','bar-jdbc','config-client','dev','master');Query OK, 1 row affected (0.00 sec)MariaDB [config]>

2.2 父级项目

   
       
    
     4.0.0
        
    
     com.cntaiping.tpa
        
    
     config
        
    
     1.0-SNAPSHOT
        
    
     pom
        
    
     config
        
    
     Demo project for Spring Boot
        
            
     
      UTF-8
             
     
      UTF-8
             
     
      1.8
             
     
      Greenwich.SR1
         
        
            
     
      org.springframework.boot
             
     
      spring-boot-starter-parent
             
     
      2.1.5.RELEASE
             
         
        
            
     
      config-server
             
     
      config-client
         
        
            
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-web
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-test
                  
      
       test
              
         
        
            
                 
                      
       
        org.springframework.cloud
                       
       
        spring-cloud-dependencies
                       
       
        ${spring-cloud.version}
                       
       
        pom
                       
       
        import
                   
              
         
        
            
                 
                      
       
        org.springframework.boot
                       
       
        spring-boot-maven-plugin
                   
              
         
    
   

2.3 Config Server模块

（1）pom文件

   
       
    
     4.0.0
        
    
     com.cntaiping.tpa
        
    
     config-server
        
    
     0.0.1-SNAPSHOT
        
    
     jar
        
    
     config-server
        
    
     Demo project for Spring Boot
        
            
     
      com.cntaiping.tpa
             
     
      config
             
     
      1.0-SNAPSHOT
         
        
            
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-config-server
              
             
                 
      
       mysql
                  
      
       mysql-connector-java
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-jdbc
              
         
    
   

(2) application.yml

spring:  profiles:    active: jdbc  application:    name: config-server  datasource:    url: jdbc:mysql://10.17.12.160:3306/config?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8&serverTimezone=GMT%2B8    username: root    password: 123456    driver-class-name: com.mysql.jdbc.Driver  cloud:    config:      label: master      server:        jdbc: trueserver:  port: 8300spring.cloud.config.server.jdbc.sql: SELECT key1, value1 from config_properties where APPLICATION=? and PROFILE=? and LABEL=?

(3) Application类

添加@EnableConfigServer

package com.cntaiping.tpa.configserver;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.config.server.EnableConfigServer;@SpringBootApplication@EnableConfigServerpublic class ConfigServerApplication {    public static void main(String[] args) {        SpringApplication.run(ConfigServerApplication.class, args);    }}

2.4 Config Client模块

(1) pom.xml

   
       
    
     4.0.0
        
    
     com.cntaiping.tpa
        
    
     config-client
        
    
     0.0.1-SNAPSHOT
        
    
     jar
        
    
     config-client
        
    
     Demo project for Spring Boot
        
            
     
      com.cntaiping.tpa
             
     
      config
             
     
      1.0-SNAPSHOT
         
        
            
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-config
              
         
    
   

(2) bootstrap.properties

新建文件bootstrap.properties

spring.application.name=config-clientspring.cloud.config.uri= http://localhost:8300/spring.cloud.config.fail-fast=truespring.profiles.active=dev

默认端口号8083

(3) Application类

package com.cntaiping.tpa.configclient;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class ConfigClientApplication {    public static void main(String[] args) {        SpringApplication.run(ConfigClientApplication.class, args);    }}

(4)控制器

package com.cntaiping.tpa.configclient.controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class ConfigController {    @Value("${server.port}")    String port;    @Value("${foo}")    String foo;    @RequestMapping(value = "/get")    public String get(String key){        if("foo".equals(key)){            return foo;        }        if("server.port".equals(key)){            return port;        }        return "";    }}

2.5 运行效果

运行server

运行client

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