基於資料庫實現配置中心。

高可用的分散式配置中心，如果配置服務部署多份，通過負載均衡，從而高可用。

一、準備工作

安裝MySql

啟動前面的專案：erurekaserver

二、建立Maven專案 config-server

1、修改pom.xml

<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>wg</groupId>
  <artifactId>config-server</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>config-server</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
    <java.version>1.8</java.version>
  </properties>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <dependencies>
  	<dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
  	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-web</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-config-server</artifactId>
	</dependency>
	<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</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>
</project>
 

2、新建application.properties

spring.application.name=config-server
server.port=30000

spring.profiles.active=jdbc
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/wg?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver

spring.cloud.config.label=master
spring.cloud.config.server.jdbc=true
spring.cloud.config.server.jdbc.sql=SELECT P_KEY, P_VALUE from CONFIG_PROPERTIES where APPLICATION=? and P_PROFILE=? and LABEL=?

eureka.client.serviceUrl.defaultZone = http://localhost:8761/eureka/
 

3、MySql建立資料庫 wg ,建立表 CONFIG_PROPERTIES，初始化表資料

CREATE DATABASE IF NOT EXISTS wg DEFAULT CHARSET utf8 COLLATE utf8_general_ci; 
USE wg; 
SET FOREIGN_KEY_CHECKS=0; 
 
 
 -- ---------------------------- 
 -- Table structure for properties 
 -- ---------------------------- 
DROP TABLE IF EXISTS CONFIG_PROPERTIES;
CREATE TABLE CONFIG_PROPERTIES(
   ID int(11) NOT NULL,
   P_KEY varchar(50) NOT NULL,
   p_VALUE varchar(500) NOT NULL,
   APPLICATION varchar(50) NOT NULL,
   P_PROFILE varchar(50) NOT NULL,
   LABEL varchar(50) NOT NULL,
   PRIMARY KEY (ID)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 
 -- ---------------------------- 
 -- Records of properties 
 -- ---------------------------- 
INSERT INTO CONFIG_PROPERTIES VALUES ('1', 'title', 'i am config by jdbc', 'eurekaclient', 'dev', 'master'); 
INSERT INTO CONFIG_PROPERTIES VALUES ('2', 'name', 'wg', 'eurekaclient', 'dev', 'master'); 
INSERT INTO CONFIG_PROPERTIES VALUES ('3', 'sex', 'boy', 'eurekaclient', 'dev', 'master'); 
 

4、新建ConfigServerApplication.java

package wg;

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);
	}
}

5、啟動專案，訪問http://localhost:8761/

三、修改 eurekaclient1

1、新建bootstrap.yml，原來的配置檔案全部刪除。

server:
  port: 8762
spring:
  application:
    name: eurekaclient
  cloud:
    config:
      label: master
      profile: dev
      discovery:
        enabled: true
        service-id: config-server
eureka:
  instance:
     instance-id: eurekaclient1
     appname: ${spring.application.name}
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

2、修改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>wg</groupId>
  <artifactId>eurekaclient1</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>eurekaclient1</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
    <java.version>1.8</java.version>
  </properties>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-eureka-client</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-web</artifactId>
    </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>

3、新建EurekaClientApplication.java

package wg;

import org.springframework.beans.factory.annotation.Autowired;
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.RestController;

import wg.config.ServerConfig;

@SpringBootApplication
@RestController
public class EurekaClientApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaClientApplication.class, args);
    }

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

    @RequestMapping("/")
    public String home() {
        return "hello world from port " + port+",title:"+serverConfig.getTitle()+" name:"+serverConfig.getName()+" sex:"+serverConfig.getSex();
    }
}

4、新建ServerConfig.java，放在EurekaClientApplication.java 下級包下。

package wg.config;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties//(prefix = "demo")
public class ServerConfig {
	private String title;
	private String sex;
	private String name;
	public String getSex() {
		return sex;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

 5、啟動專案，訪問：http://localhost:8762/

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