1.建立一個空的springboot專案
2.設定pom.xml設定文件，只修改dependencies裡面的內容，可以直接取代
<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.設定資料來源
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.新建對應
entity， mapper， service，impl
如果需要呼叫不用的資料庫來源，只需要再impl裡面使用註解@DS("資料庫名稱" )即可
5.編寫定時器呼叫資料查詢，也可以在控制器中呼叫資料查詢，查詢方式是一樣的
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 .修改啟動類別 @MapperScan("com.xyz.dsjy.mapper") 新增mapper掃描
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.啟動項目，正確輸出我們需要的結果
#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
因為pom.xml引入了druid和dynamic，而我們使用的是dynamic，所以只需要刪除druid引入即可。
坑2：
2021-04-08 15:52:53.242 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource master - -08 15:52:54.125 INFO 20108 --- [ main] com.zaxxer.hikari.HikariDataSource : master - Startupcomplepleari.HikariDataSource : master - Start20plepleted.#1202156202015:0020 15:002162120 15:1020 15:002175:00215:00215:002 15:200215:002 15:002175:00215:002 15:200215. [ main] com .zaxxer.hikari.HikariDataSource : slave - Starting...
2021-04-08 15:52:54.942 INFO 20108 --- [ 關鍵 completed.
2021-04-08 15:52:54.942 INFO 20108 --- [ main] c.b.d.d.DynamicRoutingDataSource 5:52:54.943 INFO 20108 -- - [ main] c.b.d.d.DynamicRoutingDataSource : dynamic-datasource - load a datasource named [master] success# main] c.b.d.d.DynamicRoutingDataSource : dynamic-datasource initial loaded [2 ] datasource,primary
........
2021-04-08 15:52:54.989 INFO 20108 --- [ ##........
2021-04-08 15:52:54.989 INFO 20108 --- [ main] com.zaxxer.hidownkari.H Data initiated...
2021-04-08 1. main] com.zaxxer.hikari .HikariDataSource : master - Shutdown completed.
2021-04-08 15:52:55.165 INFO 20108 --- [ 15:52:55.165 INFO 20108 --- [ Source source: all closed success,bye
可以看到啟動過程中我們配置的多資料庫來源Start completed.之後遇到例外之後又被shutdown了。
因為引入了多個Mybatis 的jar包引起的，檢查bom.xml檔案是否引入了mybatis和mybatis-plus兩個依賴，如果是去掉mybatis即可。
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