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SpringBoot结合Quartz实现数据库存储

程序员文章站 2022-06-18 11:37:34
目录一、先创建一个springboot项目二、导入依赖三、导入druidconnectionprovider.java(druid连接池的quartz扩展类)四、修改自定义quartz.propert...

一、先创建一个springboot项目

SpringBoot结合Quartz实现数据库存储

SpringBoot结合Quartz实现数据库存储

SpringBoot结合Quartz实现数据库存储

SpringBoot结合Quartz实现数据库存储

SpringBoot结合Quartz实现数据库存储

还有一个截屏忘了截屏,就是选择保存路径选择一下就点finish就可以了。 

更改application.properties为application.yml

application.yml文件如下

server:
  port: 8080
 
 
 
#数据库连接池druid配置
 
spring:
  datasource:
    #1.jdbc
    type: com.alibaba.druid.pool.druiddatasource
    driver-class-name: com.mysql.cj.jdbc.driver
    url: jdbc:mysql://localhost:3306/quartz?useunicode=true&characterencoding=utf8&servertimezone=gmt%2b8&usessl=false
    username: root
    password: 123
    druid:
      #2.连接池配置
      #初始化连接池的连接数量 大小,最小,最大
      initial-size: 5
      min-idle: 5
      max-active: 20
      #配置获取连接等待超时的时间
      max-wait: 60000
      #配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
      time-between-eviction-runs-millis: 60000
      # 配置一个连接在池中最小生存的时间,单位是毫秒
      min-evictable-idle-time-millis: 30000
      validation-query: select 1 from dual
      test-while-idle: true
      test-on-borrow: true
      test-on-return: false
      # 是否缓存preparedstatement,也就是pscache  官方建议mysql下建议关闭   个人建议如果想用sql防火墙 建议打开
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      # 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
      filter:
        stat:
          merge-sql: true
          slow-sql-millis: 5000
      #3.基础监控配置
      web-stat-filter:
        enabled: true
        url-pattern: /*
        #设置不统计哪些url
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
        session-stat-enable: true
        session-stat-max-count: 100
      stat-view-servlet:
        enabled: true
        url-pattern: /druid/*
        reset-enable: true
        #设置监控页面的登录名和密码
        login-username: admin
        login-password: admin
        allow: 127.0.0.1
 
 
mybatis:
  mapper-locations: classpath*:mapper/*.xml
 
  type-aliases-package: com.zking.quartz02.model
 
 

二、导入依赖 

1.导入quartz依赖

<dependency>
	<groupid>org.quartz-scheduler</groupid>
	<artifactid>quartz-jobs</artifactid>
	<version>2.2.1</version>
 </dependency>
 <dependency>
   	<groupid>org.springframework.boot</groupid>
   	<artifactid>spring-boot-starter-quartz</artifactid>
 </dependency>

2.用于我用的是druid数据库连接池,所以我需要更换成druid连接池,先引入druid依赖。

<dependency>
	<groupid>com.alibaba</groupid>
	<artifactid>druid-spring-boot-starter</artifactid>
	<version>1.1.10</version>
</dependency>

三、 导入druidconnectionprovider.java(druid连接池的quartz扩展类)

package com.zking.quartz02.utils;
 
import com.alibaba.druid.pool.druiddatasource;
import org.quartz.schedulerexception;
import org.quartz.utils.connectionprovider;
 
import java.sql.connection;
import java.sql.sqlexception;
 
/*
#============================================================================
# jdbc
#============================================================================
org.quartz.jobstore.driverdelegateclass:org.quartz.impl.jdbcjobstore.stdjdbcdelegate
org.quartz.jobstore.useproperties:false
org.quartz.jobstore.datasource:qzds
#org.quartz.datasource.qzds.connectionprovider.class:org.quartz.utils.poolingconnectionprovider
org.quartz.datasource.qzds.connectionprovider.class:com.zking.q03.quartz.druidconnectionprovider
org.quartz.datasource.qzds.driver:com.mysql.jdbc.driver
org.quartz.datasource.qzds.url:jdbc:mysql://127.0.0.1:3306/test?useunicode=true&characterencoding=utf-8
org.quartz.datasource.qzds.user:root
org.quartz.datasource.qzds.password:root
org.quartz.datasource.qzds.maxconnections:30
org.quartz.datasource.qzds.validationquery: select 0
*/
 
/**
 * [druid连接池的quartz扩展类]
 */
public class druidconnectionprovider implements connectionprovider {
 
     /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     *
     * 常量配置,与quartz.properties文件的key保持一致(去掉前缀),同时提供set方法,quartz框架自动注入值。
     *
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */
 
    //jdbc驱动
    public string driver;
    //jdbc连接串
    public string url;
    //数据库用户名
    public string user;
    //数据库用户密码
    public string password;
    //数据库最大连接数
    public int maxconnection;
    //数据库sql查询每次连接返回执行到连接池,以确保它仍然是有效的。
    public string validationquery;
 
    private boolean validateoncheckout;
 
    private int idleconnectionvalidationseconds;
 
    public string maxcachedstatementsperconnection;
 
    private string discardidleconnectionsseconds;
 
    public static final int default_db_max_connections = 10;
 
    public static final int default_db_max_cached_statements_per_connection = 120;
 
    //druid连接池
    private druiddatasource datasource;
 
    /*
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    *
    * 接口实现
    *
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    */
    public connection getconnection() throws sqlexception {
        return datasource.getconnection();
    }
 
    public void shutdown() throws sqlexception {
        datasource.close();
    }
    public void initialize() throws sqlexception{
        if (this.url == null) {
            throw new sqlexception("dbpool could not be created: db url cannot be null");
        }
 
        if (this.driver == null) {
            throw new sqlexception("dbpool driver could not be created: db driver class name cannot be null!");
        }
 
        if (this.maxconnection < 0) {
            throw new sqlexception("dbpool maxconnectins could not be created: max connections must be greater than zero!");
        }
 
        datasource = new druiddatasource();
        try{
            datasource.setdriverclassname(this.driver);
        } catch (exception e) {
            try {
                throw new schedulerexception("problem setting driver class name on datasource: " + e.getmessage(), e);
            } catch (schedulerexception e1) {
            }
        }
 
        datasource.seturl(this.url);
        datasource.setusername(this.user);
        datasource.setpassword(this.password);
        datasource.setmaxactive(this.maxconnection);
        datasource.setminidle(1);
        datasource.setmaxwait(0);
        datasource.setmaxpoolpreparedstatementperconnectionsize(this.default_db_max_cached_statements_per_connection);
 
        if (this.validationquery != null) {
            datasource.setvalidationquery(this.validationquery);
            if(!this.validateoncheckout)
                datasource.settestonreturn(true);
            else
                datasource.settestonborrow(true);
            datasource.setvalidationquerytimeout(this.idleconnectionvalidationseconds);
        }
    }
 
    /*
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    *
    * 提供get set方法
    *
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    */
    public string getdriver() {
        return driver;
    }
 
    public void setdriver(string driver) {
        this.driver = driver;
    }
 
    public string geturl() {
        return url;
    }
 
    public void seturl(string url) {
        this.url = url;
    }
 
    public string getuser() {
        return user;
    }
 
    public void setuser(string user) {
        this.user = user;
    }
 
    public string getpassword() {
        return password;
    }
 
    public void setpassword(string password) {
        this.password = password;
    }
 
    public int getmaxconnection() {
        return maxconnection;
    }
 
    public void setmaxconnection(int maxconnection) {
        this.maxconnection = maxconnection;
    }
 
    public string getvalidationquery() {
        return validationquery;
    }
 
    public void setvalidationquery(string validationquery) {
        this.validationquery = validationquery;
    }
 
    public boolean isvalidateoncheckout() {
        return validateoncheckout;
    }
 
    public void setvalidateoncheckout(boolean validateoncheckout) {
        this.validateoncheckout = validateoncheckout;
    }
 
    public int getidleconnectionvalidationseconds() {
        return idleconnectionvalidationseconds;
    }
 
    public void setidleconnectionvalidationseconds(int idleconnectionvalidationseconds) {
        this.idleconnectionvalidationseconds = idleconnectionvalidationseconds;
    }
 
    public druiddatasource getdatasource() {
        return datasource;
    }
 
    public void setdatasource(druiddatasource datasource) {
        this.datasource = datasource;
    }
}

四、 修改自定义quartz.properties配置(在项目中添加quartz.properties文件(这样就不会加载自带的properties文件) )

#
#============================================================================
# configure main scheduler properties \u8c03\u5ea6\u5668\u5c5e\u6027
#============================================================================
org.quartz.scheduler.instancename: defaultquartzscheduler
org.quartz.scheduler.instanceid = auto
org.quartz.scheduler.rmi.export: false
org.quartz.scheduler.rmi.proxy: false
org.quartz.scheduler.wrapjobexecutioninusertransaction: false
org.quartz.threadpool.class: org.quartz.simpl.simplethreadpool
org.quartz.threadpool.threadcount= 10
org.quartz.threadpool.threadpriority: 5
org.quartz.threadpool.threadsinheritcontextclassloaderofinitializingthread: true
org.quartz.jobstore.misfirethreshold: 60000
#============================================================================
# configure jobstore
#============================================================================
#\u5b58\u50a8\u65b9\u5f0f\u4f7f\u7528jobstoretx\uff0c\u4e5f\u5c31\u662f\u6570\u636e\u5e93
org.quartz.jobstore.class: org.quartz.impl.jdbcjobstore.jobstoretx
org.quartz.jobstore.driverdelegateclass:org.quartz.impl.jdbcjobstore.stdjdbcdelegate
#\u4f7f\u7528\u81ea\u5df1\u7684\u914d\u7f6e\u6587\u4ef6
org.quartz.jobstore.useproperties:true
#\u6570\u636e\u5e93\u4e2dquartz\u8868\u7684\u8868\u540d\u524d\u7f00
org.quartz.jobstore.tableprefix:qrtz_
org.quartz.jobstore.datasource:qzds
#\u662f\u5426\u4f7f\u7528\u96c6\u7fa4\uff08\u5982\u679c\u9879\u76ee\u53ea\u90e8\u7f72\u5230 \u4e00\u53f0\u670d\u52a1\u5668\uff0c\u5c31\u4e0d\u7528\u4e86\uff09
org.quartz.jobstore.isclustered = true
#============================================================================
# configure datasources
#============================================================================
#\u914d\u7f6e\u6570\u636e\u5e93\u6e90
org.quartz.datasource.qzds.connectionprovider.class: com.zking.quartz02.utils.druidconnectionprovider
org.quartz.datasource.qzds.driver: com.mysql.cj.jdbc.driver
#修改为自己的数据库名称、用户名和密码
org.quartz.datasource.qzds.url: jdbc:mysql://localhost:3306/quartz?useunicode=true&characterencoding=utf8&servertimezone=gmt%2b8&usessl=false
org.quartz.datasource.qzds.user: root
org.quartz.datasource.qzds.password: 123
org.quartz.datasource.qzds.maxconnection: 10

在数据库中创建quartz相关的表
   进入quartz的官网http://www.quartz-scheduler.org/,点击downloads,
   下载后在目录\docs\dbtables下有常用数据库创建quartz表的脚本,例如:“tables_mysql.sql”

五、自定义myjobfactory,解决spring不能在quartz中注入bean的问题

package com.zking.quartz02.quartz;
 
import org.quartz.spi.triggerfiredbundle;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.beans.factory.config.autowirecapablebeanfactory;
import org.springframework.scheduling.quartz.adaptablejobfactory;
import org.springframework.stereotype.component;
 
//解决spring不能在quartz中注入bean的问题
@component
public class myjobfactory extends adaptablejobfactory {
 
    @autowired
    private autowirecapablebeanfactory autowirecapablebeanfactory;
 
    @override
    protected object createjobinstance(triggerfiredbundle bundle) throws exception {
        object jobinstance = super.createjobinstance(bundle);
        autowirecapablebeanfactory.autowirebean(jobinstance);
        return jobinstance;
    }
}

六、创建调度器schedule

package com.zking.quartz02.quartz;
 
//quartz配置类将调度器交给spring管理
 
import org.quartz.scheduler;
import org.quartz.schedulerfactory;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.beans.factory.config.propertiesfactorybean;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.core.io.classpathresource;
import org.springframework.scheduling.annotation.scheduled;
import org.springframework.scheduling.quartz.schedulerfactorybean;
 
import java.io.ioexception;
import java.util.properties;
 
@configuration
public class quartzconfiguration {
 
    @autowired
    private  myjobfactory myjobfactory;
 
    @bean
    public scheduler scheduler(){
        return this.getschedulerfactorybean().getscheduler();
    }
 
    //读取自定义配置文件,获取调度器工厂
    @bean
    public schedulerfactorybean getschedulerfactorybean(){
        //1.创建schedulerfactorybean sc=new schedulerfactorybean
        schedulerfactorybean sc=new schedulerfactorybean();
        //2.加载自定义的quartz.properties
        sc.setquartzproperties(this.getproperties());
        //3.设置自定义的myjobfactory
        sc.setjobfactory(myjobfactory);
 
        return sc;
    }
 
    //读取配置文件
    @bean
    public properties getproperties(){
 
        try {
            propertiesfactorybean propertiesfactorybean =
                    new propertiesfactorybean();
 
            //设置自定义配置文件位置
            propertiesfactorybean.setlocation(new classpathresource("/quartz.properties"));
            //读取配置文件
            propertiesfactorybean.afterpropertiesset();
 
            return  propertiesfactorybean.getobject();
        } catch (ioexception e) {
            e.printstacktrace();
            throw new runtimeexception(e);
        }
 
 
    }
 
 
}

七、 创建自定义任务

 首先我们需要自己创建一张表t_schedule_trigger,用来存放trigger的信息,然后从数据库读取这些信息来随时更新定时任务
   注意:job_name存放的任务类的全路径,在quartz中通过jobname和jobgroup来确定trigger的唯一性,所以这两列为联合唯一索引 

t_schedule_trigger和t_schedule_trigger_param表生成的sql代码如下(去执行一下sql语句即可)

 
-- 注意:job_name存放的任务类的全路径,在quartz中通过jobname和jobgroup来确定trigger的唯一性,所以这两列为联合唯一索引
create table t_schedule_trigger
(
  id int primary key auto_increment,                                -- id
  cron varchar(200) not null,                                       -- 时间表达式
  status char(1) not null,                                          -- 使用状态 0:禁用   1:启用
  job_name varchar(200) not null,                                 -- 任务名称
  job_group varchar(200) not null,                                 -- 任务分组  
  unique index(job_name,job_group)
);
 
-- 额外添加到任务中的参数
create table t_schedule_trigger_param
(
  param_id int primary key auto_increment,                                -- id
  name varchar(200) not null,                                             -- 参数名
  value varchar(512),                                                     -- 参数值
 
  schedule_trigger_id int not null,                                       -- 外键:引用t_schedule_trigger(id)
  foreign key(schedule_trigger_id) references t_schedule_trigger(id)
);

   注1:t_schedule_trigger的子表t_schedule_trigger_param还可以用来传递额外添加到任务中的参数

   注2:实现org.quartz.job或org.springframework.scheduling.quartz.quartzjobbean创建任务,可通过jobexecutioncontext传参

八、 更新quartz中的任务

首先我们将t_schedule_trigger和t_schedule_trigger_param通过generatorconfig.xml自动生成实体类,xxmapper.java,xxmapper.xml.

<?xml version="1.0" encoding="utf-8" ?>
<!doctype generatorconfiguration public "-//mybatis.org//dtd mybatis generator configuration 1.0//en"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorconfiguration>
    <!-- 引入配置文件 -->
<!--    <properties resource="jdbc.properties"/>-->
 
    <!--指定数据库jdbc驱动jar包的位置-->
    <classpathentry location="d:\\installpath\\apache-maven-3.5.4\\jar\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>
 
    <!-- 一个数据库一个context -->
    <context id="infoguardian">
        <!-- 注释 -->
        <commentgenerator>
            <property name="suppressallcomments" value="true"/><!-- 是否取消注释 -->
            <property name="suppressdate" value="true"/> <!-- 是否生成注释代时间戳 -->
        </commentgenerator>
 
        <!-- jdbc连接 -->
        <jdbcconnection driverclass="com.mysql.jdbc.driver"
                        connectionurl="jdbc:mysql://localhost:3306/quartz?useunicode=true&amp;characterencoding=utf-8" userid="root" password="123"/>
 
        <!-- 类型转换 -->
        <javatyperesolver>
            <!-- 是否使用bigdecimal, false可自动转化以下类型(long, integer, short, etc.) -->
            <property name="forcebigdecimals" value="false"/>
        </javatyperesolver>
 
        <!-- 01 指定javabean生成的位置 -->
        <!-- targetpackage:指定生成的model生成所在的包名 -->
        <!-- targetproject:指定在该项目下所在的路径  -->
        <javamodelgenerator targetpackage="com.zking.quartz02.model"
                            targetproject="src/main/java">
            <!-- 是否允许子包,即targetpackage.schemaname.tablename -->
            <property name="enablesubpackages" value="false"/>
            <!-- 是否对model添加构造函数 -->
            <property name="constructorbased" value="true"/>
            <!-- 是否针对string类型的字段在set的时候进行trim调用 -->
            <property name="trimstrings" value="false"/>
            <!-- 建立的model对象是否 不可改变  即生成的model对象不会有 setter方法,只有构造方法 -->
            <property name="immutable" value="false"/>
        </javamodelgenerator>
 
        <!-- 02 指定sql映射文件生成的位置 -->
        <sqlmapgenerator targetpackage="mapper"
                         targetproject="src/main/resources">
            <!-- 是否允许子包,即targetpackage.schemaname.tablename -->
            <property name="enablesubpackages" value="false"/>
        </sqlmapgenerator>
 
        <!-- 03 生成xxxmapper接口 -->
        <!-- type="annotatedmapper",生成java model 和基于注解的mapper对象 -->
        <!-- type="mixedmapper",生成基于注解的java model 和相应的mapper对象 -->
        <!-- type="xmlmapper",生成sqlmap xml文件和独立的mapper接口 -->
        <javaclientgenerator targetpackage="com.zking.quartz02.mapper"
                             targetproject="src/main/java" type="xmlmapper">
            <!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model, true:com.oop.eksp.user.model.[schemaname] -->
            <property name="enablesubpackages" value="false"/>
        </javaclientgenerator>
 
        <!-- 配置表信息 -->
        <!-- schema即为数据库名 -->
        <!-- tablename为对应的数据库表 -->
        <!-- domainobjectname是要生成的实体类 -->
        <!-- enable*byexample是否生成 example类 -->
        <!--<table schema="" tablename="t_book" domainobjectname="book"-->
               <!--enablecountbyexample="false" enabledeletebyexample="false"-->
               <!--enableselectbyexample="false" enableupdatebyexample="false">-->
            <!--&lt;!&ndash; 忽略列,不生成bean 字段 &ndash;&gt;-->
            <!--&lt;!&ndash; <ignorecolumn column="fred" /> &ndash;&gt;-->
            <!--&lt;!&ndash; 指定列的java数据类型 &ndash;&gt;-->
            <!--&lt;!&ndash; <columnoverride column="long_varchar_field" jdbctype="varchar" /> &ndash;&gt;-->
        <!--</table>-->
 
        <table schema="" tablename="t_schedule_trigger_param" domainobjectname="scheduletriggerparam"
               enablecountbyexample="false" enabledeletebyexample="false"
               enableselectbyexample="false" enableupdatebyexample="false">
            <!-- 忽略列,不生成bean 字段 -->
            <!-- <ignorecolumn column="fred" /> -->
            <!-- 指定列的java数据类型 -->
            <!-- <columnoverride column="long_varchar_field" jdbctype="varchar" /> -->
        </table>
 
        <table schema="" tablename="t_schedule_trigger" domainobjectname="scheduletrigger"
               enablecountbyexample="false" enabledeletebyexample="false"
               enableselectbyexample="false" enableupdatebyexample="false">
            <!-- 忽略列,不生成bean 字段 -->
            <!-- <ignorecolumn column="fred" /> -->
            <!-- 指定列的java数据类型 -->
            <!-- <columnoverride column="long_varchar_field" jdbctype="varchar" /> -->
        </table>
 
    </context>
</generatorconfiguration>

记得修改数据库jdbc驱动jar包的位置为自己数据库jdbc驱动jar包的位置,jdbc连接数据库名、用户名和密码改为自己的。

注意:targetpackage改成自己的包名。

自动生成操作

SpringBoot结合Quartz实现数据库存储

SpringBoot结合Quartz实现数据库存储

命令:mybatis-generator:generate -e

注意:实体类上加一个@data,xxmapper.java上加一个@repository自己需要写一个查询全部的方法。

写一个ischeduleservice接口,用来定时刷新任务,更新调度器中的任务

package com.zking.quartz02.service;
 
public interface ischeduleservice {
 
    //定时刷新任务,更新调度器中的任务
    public void refresh();
}

实现ischeduleservice接口

package com.zking.quartz02.service.impl;
 
import com.zking.quartz02.mapper.scheduletriggermapper;
import com.zking.quartz02.mapper.scheduletriggerparammapper;
import com.zking.quartz02.model.scheduletrigger;
import com.zking.quartz02.model.scheduletriggerparam;
import com.zking.quartz02.service.ischeduleservice;
import org.quartz.*;
import org.springframework.scheduling.annotation.scheduled;
import org.springframework.stereotype.service;
 
import javax.annotation.resource;
import java.util.list;
 
@service
public class scheduleserviceimpl implements ischeduleservice {
 
    @resource
    private scheduletriggermapper scheduletriggermapper;
 
    @resource
    private scheduletriggerparammapper scheduletriggerparammapper;
 
    @resource
    private scheduler scheduler;
 
    @scheduled(cron = "*/10 * * * * ?")
    @override
    public void refresh() {
 
        try {
            //1.查询数据库中所有的任务
            list<scheduletrigger> scheduletriggers =
                    scheduletriggermapper.listscheduletrigger();
 
            //2.遍历所有任务
            for (scheduletrigger scheduletrigger : scheduletriggers) {
                integer id = scheduletrigger.getid();
                string cron = scheduletrigger.getcron();
                string status = scheduletrigger.getstatus();
                string jobname = scheduletrigger.getjobname();
                string jobgroup = scheduletrigger.getjobgroup();
 
                //设置triggerkey
                triggerkey triggerkey = triggerkey.triggerkey(jobname, jobgroup);
 
                //通过triggerkey获取调度器中的触发器
                crontrigger crontrigger = (crontrigger)scheduler.gettrigger(triggerkey);
 
                if(null==crontrigger){//如果为空,表示调度器中没有该任务,不存在就添加任务
                    if("0".equals(status)){//如果该任务状态为0,表示该任务不用添加,此次循环结束
                        continue;
                    }
 
                    //创建触发器
                    crontrigger crontrigger1 = triggerbuilder.newtrigger()
                            .withidentity(jobname, jobgroup)
                            .withschedule(cronschedulebuilder.cronschedule(cron))
                            .build();
 
                    //创建工作详情实例
                    jobdetail jobdetail = jobbuilder.newjob((class<? extends job>) class.forname(jobname))
                            .withidentity(jobname, jobgroup)
                            .build();
 
                    jobdatamap jobdatamap = jobdetail.getjobdatamap();
 
 
                    //查询该任务中所有的参数
                    list<scheduletriggerparam> scheduletriggerparams = scheduletriggerparammapper.listscheduletriggerparambyid(id);
 
 
                    //遍历所有参数,将参数设置到jobdatamap中
                    for (scheduletriggerparam scheduletriggerparam : scheduletriggerparams) {
                        jobdatamap.put(scheduletriggerparam.getname(),scheduletriggerparam.getvalue());
                    }
 
 
                    //添加任务,将触发器和工作详情实例添加到调度器中
                    scheduler.schedulejob(jobdetail,crontrigger1);
 
 
                }else{//如果不为空,表示调度器中存在该任务
                    if("0".equals(status)){//如果任务状态改为禁用,移除该任务
                        jobkey jobkey = jobkey.jobkey(jobname, jobgroup);
                        scheduler.deletejob(jobkey);//移除任务
                    }
 
 
 
                    //如果调度器中的触发器的表达式和数据库中的表达式不一致
 
                    //获取调度器中触发器的表达式
                    string cronexpression = crontrigger.getcronexpression();
                    if(!cronexpression.equals(cron)){//不一致
                        //重新创建新的触发器
                        crontrigger crontrigger2 = triggerbuilder.newtrigger()
                                .withidentity(jobname, jobgroup)
                                .withschedule(cronschedulebuilder.cronschedule(cron))
                                .build();
 
                        //更新调度器中的触发器
                        scheduler.reschedulejob(triggerkey,crontrigger2);
                    }
 
 
 
 
 
                }
            }
 
        } catch (exception e) {
            e.printstacktrace();
            throw new runtimeexception(e);
        }
 
    }
}

1) service层实现类使用@scheduled注解声明一个方法用于定时刷新数据库中的调度任务;
 2) 使用@resource注解注入scheduler,在第5点中已装配到spring上下文;

 3) 在启动类上加入@mapperscan(指定要变成实现类的接口所在的包路径,比如我的就是com.zking.quartz02.mapper),然后包下面的所有接口在编译之后都会生成相应的实现类;
 4) 在启动类上加入@enablescheduling启动spring自带定时器任务;

小结:

   要搞清楚一个问题:从数据库读取任务信息动态生成定时任务,和把quartz持久化到数据库是没有关系的。
   前者是我们自己定义的业务表,而后者是quartz使用自己的表来存储信息。持久化到数据库后,
   就算服务器重启或是多个quartz节点也没关系,因为他们共享数据库中的任务信息。

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