參考開源專案dynamic:https://github.com/baomidou/dynamic-datasource-spring-boot-starter

引入pom：

        <!-- 動態資料來源 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <
 
version>2.5.4</version>
        </dependency>

配置檔案yml中：

spring:
  autoconfigure:
    #自動化配置 例外處理
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    #多資料來源配置
    dynamic:
      primary: db1
      datasource:
        # 資料庫1
        db1:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://xxxx:3306/xxx?useUnicode=true
 
&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai
          username: xxx
          password: xxxx
        # 資料庫2
        db2:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://xxxx:3306/xxx?useUnicode=true&characterEncoding
 
=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=Asia/Shanghai
          username: xxx
          password: xxxx
      #dynamic - 公共配置
      druid:
        initialSize: 5
        minIdle: 5
        maxActive: 30
        maxWait: 60000
        timeBetweenEvictionRunsMillis: 60000
        minEvictableIdleTimeMillis: 300000
        validationQuery: SELECT 'x'
        testWhileIdle: true
        testOnBorrow: false
        testOnReturn: false
        poolPreparedStatements: true
        maxPoolPreparedStatementPerConnectionSize: 20
        filters: stat,wall,slf4j,config
        useGlobalDataSourceStat: true
        stat:
          log-slow-sql: true
          merge-sql: true
          slow-sql-millis: 10000

用法：在相應service類或方法上新增DS註解，如：

package com.tuijie.loanapi.service.impl;

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.tuijie.loanapi.mapper.TestUserMapper;
import com.tuijie.loanapi.model.mysql.TestUser;
import com.tuijie.loanapi.service.TestUserService;
import org.springframework.stereotype.Service;

/**
 * TestUserServiceImpl
 * 測試ServiceImpl
 * @version :
 */
@Service
@DS("db2")
public class TestUserServiceImpl extends ServiceImpl<TestUserMapper, TestUser> implements TestUserService {
}