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1.创建一个空的springboot项目
2.配置pom.xml配置文件，只修改dependencies里面的内容，可以直接替换
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> </dependency> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.2.0</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.9</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!-- mybatis-plus --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.1</version> </dependency> <!-- 多数据源配置 --> <dependency> <groupId>com.baomidou</groupId> <artifactId>dynamic-datasource-spring-boot-starter</artifactId> <version>3.2.0</version> </dependency> <!-- mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency></dependencies>3.配置数据源
spring: datasource:dynamic: primary: master #指定默认数据库，下面可以配置多个数据库，不仅仅是两个，master就是其中一个数据库的名字，名字对应就可以，自己随便取 datasource:master: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://数据库1ip地址:数据库1端口/数据库1?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&allowMultiQueries=true username: 数据库1用户 password: 数据库1密码slave: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://数据库2ip地址:数据库2端口/数据库2?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&allowMultiQueries=true username: 数据库2用户 password: 数据库2密码4.新建对应
entity， mapper， service，impl
如果需要调用不用的数据库源，只需要再impl里面使用注释@DS("数据库名称")即可
5.编写定时器调用数据查询，也可以在控制器中调用数据查询，查询方式是一样的
package com.xyz.dsjy.task;import com.xyz.dsjy.entity.Enterprise;import com.xyz.dsjy.entity.FjflCredit;import com.xyz.dsjy.service.EnterpriseService;import com.xyz.dsjy.service.FjflCreditService;import lombok.AllArgsConstructor;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.annotation.EnableScheduling;import org.springframework.scheduling.annotation.Scheduled;import org.springframework.stereotype.Component;import java.time.LocalDateTime;@AllArgsConstructor@Component@Configuration //1.主要用于标记配置类，兼备Component的效果。@EnableScheduling // 2.开启定时任务public class MultithreadScheduleTask {public final FjflCreditService fjflCrediService; public final EnterpriseService enterpriseService; @Scheduled(fixedRate=5000)private void configureTasks() { FjflCredit fs = fjflCrediService.getById(1); System.out.println(fs); System.err.println("执行静态定时任务时间: " + LocalDateTime.now()); }@Scheduled(fixedRate=6000)private void configureTasks2() { Enterprise et = enterpriseService.getById(80); System.out.println(et); System.err.println("执行静态定时任务时间2222: " + LocalDateTime.now()); }}6.修改启动类 @MapperScan("com.xyz.dsjy.mapper") 添加mapper扫描
package com.xyz.dsjy;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@MapperScan("com.xyz.dsjy.mapper") //添加启动扫mapper包下的mapper类public class DsjyApplication {public static void main(String[] args) { SpringApplication.run(DsjyApplication.class, args); }}7.启动项目，正确输出我们需要的结果
遇到的坑：
坑1：
Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver clas
因为pom.xml引入了druid和dynamic，而我们使用的是dynamic，所以只需要删除druid引入即可。
坑2：
2021-04-08 15:52:53.242 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : master - Starting...
2021-04-08 15:52:54.125 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : master - Start completed.
2021-04-08 15:52:54.126 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : slave - Starting...
2021-04-08 15:52:54.942 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : slave - Start completed.
2021-04-08 15:52:54.942 INFO 20108 --- [ main] c.b.d.d.DynamicRoutingDataSource : dynamic-datasource - load a datasource named [slave] success
2021-04-08 15:52:54.943 INFO 20108 --- [ main] c.b.d.d.DynamicRoutingDataSource : dynamic-datasource - load a datasource named [master] success
2021-04-08 15:52:54.943 INFO 20108 --- [ main] c.b.d.d.DynamicRoutingDataSource : dynamic-datasource initial loaded [2] datasource,primary
........
2021-04-08 15:52:54.989 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : slave - Shutdown initiated...
2021-04-08 15:52:54.996 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : slave - Shutdown completed.
2021-04-08 15:52:54.996 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : master - Shutdown initiated...
2021-04-08 15:52:55.164 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : master - Shutdown completed.
2021-04-08 15:52:55.165 INFO 20108 --- [ main] c.b.d.d.DynamicRoutingDataSource : dynamic-datasource all closed success,bye
可以看到启动过程中我们配置的多数据库源Start completed.之后遇到异常之后又被shutdown了。
因为引入了多个Mybatis 的jar包引起的，检查bom.xml文件是否引入了mybatis和mybatis-plus两个依赖，如果是去掉mybatis即可。
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