SpringCloud 2.x学习笔记：5、Config（Greenwich版本）

川长思鸟来 2022-01-17 01:21 258阅读 0赞

说明：参考 [https://www.fangzhipeng.com/springcloud/2019/02/21/config-jdbc.html][https_www.fangzhipeng.com_springcloud_2019_02_21_config-jdbc.html]

## 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 changed
    MariaDB [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 ###

![在这里插入图片描述][20190612163935555.png]

<?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.cntaiping.tpa</groupId>
        <artifactId>config</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>pom</packaging>
        <name>config</name>
        <description>Demo project for Spring Boot</description>
    
        <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>Greenwich.SR1</spring-cloud.version>
        </properties>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.5.RELEASE</version>
            <relativePath/>
        </parent>
    
        <modules>
            <module>config-server</module>
            <module>config-client</module>
        </modules>
    
        <dependencies>
            <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>${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>

### 2.3 Config Server模块 ###

#### （1）pom文件 ####

#### (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: true
    server:
      port: 8300
    spring.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
    @EnableConfigServer
    public class ConfigServerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ConfigServerApplication.class, args);
        }
    
    }

### 2.4 Config Client模块 ###

#### (1) pom.xml ####

#### (2) bootstrap.properties ####

新建文件bootstrap.properties  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70]

spring.application.name=config-client
    spring.cloud.config.uri= http://localhost:8300/
    spring.cloud.config.fail-fast=true
    spring.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;
    
    @SpringBootApplication
    public 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;
    
    @RestController
    public 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  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 1]  
运行client  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 2]

[http://localhost:8083/get?key=server.port][http_localhost_8083_get_key_server.port]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 3]  
[http://localhost:8083/get?key=foo][http_localhost_8083_get_key_foo]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 4]

[https_www.fangzhipeng.com_springcloud_2019_02_21_config-jdbc.html]: https://www.fangzhipeng.com/springcloud/2019/02/21/config-jdbc.html
[20190612163935555.png]: /images/20220117/412abbebf3da4fddbd27882453285c34.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70]: /images/20220117/2ba0f04d1d96441197eb8f297044d443.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 1]: /images/20220117/bca16fb1143f4a318f3902130ebfc322.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 2]: /images/20220117/77d012541f7240e7a24b6a177ae082f6.png
[http_localhost_8083_get_key_server.port]: http://localhost:8083/get?key=server.port
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 3]: /images/20220117/a5f91b744f724db5a4c87e330b5d5a5b.png
[http_localhost_8083_get_key_foo]: http://localhost:8083/get?key=foo
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 4]: /images/20220117/5b81cc1a399b4cb2a24ad75500dbba50.png