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

程裕强

发布于 2019-07-02 10:39:44

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发布于 2019-07-02 10:39:44

文章被收录于专栏：大数据学习笔记大数据学习笔记

说明：参考 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

<?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

<?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-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>config-server</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>com.cntaiping.tpa</groupId>
        <artifactId>config</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
    </dependencies>

</project>

(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

<?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-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>config-client</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>com.cntaiping.tpa</groupId>
        <artifactId>config</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
    </dependencies>

</project>

(2) bootstrap.properties

新建文件bootstrap.properties

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 "";
    }
}