SpringBoot2.0.3之quartz集成，不是你想的那樣哦！

cnblogs.com/youzhibing/p/10024558.html

java定時任務調度的實現方式　

Timer

這個相信大家都有用過，我也用過，但用的不多；

特點是：簡單易用，但由於所有任務都是由同一個線程來調度，因此所有任務都是串行執行的，同一時間只能有一個任務在執行，前一個任務的延遲或異常都將會影響到之後的任務；能實現簡單的定時任務，稍微複雜點（或要求高一些）的定時任務卻不好實現。

ScheduledExecutor

這個我相信大家也都用過，而且用的比Timer多；正是鑑於Timer的缺陷，Java 5推出了基於線程池設計的ScheduledExecutor；

特點：每一個被調度的任務都會由線程池中一個線程去執行，因此任務是併發執行的，相互之間不會受到干擾。需要注意的是，只有當任務的執行時間到來時，ScheduedExecutor 才會真正啟動一個線程，其餘時間 ScheduledExecutor 都是在輪詢任務的狀態。

雖然用ScheduledExecutor和Calendar能夠實現複雜任務調度，但實現起來還是比較麻煩，對開發還是不夠友善。

Spring Scheduler

spring對任務調度的實現支持，可以指定任務的執行時間，但對任務隊列和線程池的管控較弱；一般集成於項目中，小任務很方便。

JCronTab

JCronTab則是一款完全按照crontab語法編寫的Java任務調度工具。

特點：

• 可指定任務的執行時間；
• 提供完全按照Unix的UNIX-POSIX crontab的格式來規定時間；
• 支持多種任務調度的持久化方法，包括普通文件、數據庫以及 XML 文件進行持久化；
• JCronTab內置了發郵件功能，可以將任務執行結果方便地發送給需要被通知的人；
• 設計和部署是高性能並可擴展。

Quartz

本文主角，請往下看

當然還有XXL-JOB、Elastic-Job、Saturn等等

quartz相關概念

• Scheduler：調度器，進行任務調度；quartz的大腦
• Job：業務job，亦可稱業務組件；定時任務的具體執行業務需要實現此接口，調度器會調用此接口的execute方法完成我們的定時業務
• JobDetail：用來定義業務Job的實例，我們可以稱之為quartz job，很多時候我們談到的job指的是JobDetail
• Trigger：觸發器，用來定義一個指定的Job何時被執行
• JobBuilder：Job構建器，用來定義或創建JobDetail的實例；JobDetail限定了只能是Job的實例
• TriggerBuilder：觸發器構建器，用來定義或創建觸發器的實例

具體為什麼要分這麼細，大家可以去查閱下相關資料，你會發現很多東西。

工程實現

pom.xml

<code>
<project>         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>com.lee/<groupid>
    <artifactid>spring-boot-quartz/<artifactid>
    <version>1.0-SNAPSHOT/<version>

    <properties> 

        <java.version>1.8/<java.version>
        <maven.compiler.source>1.8/<maven.compiler.source>
        <maven.compiler.target>1.8/<maven.compiler.target>
        <druid.version>1.1.10/<druid.version>
        <pagehelper.version>1.2.5/<pagehelper.version>
        <druid.version>1.1.10/<druid.version>
    /<properties>

    <parent>
        <groupid>org.springframework.boot/<groupid>
        <artifactid>spring-boot-starter-parent/<artifactid>
        <version>2.0.3.RELEASE/<version>
    /<parent>

    <dependencies>
        <dependency>
            <groupid>org.springframework.boot/<groupid>
            <artifactid>spring-boot-starter-web/<artifactid>
        /<dependency>
        <dependency>
            <groupid>org.springframework.boot/<groupid>
            <artifactid>spring-boot-starter-thymeleaf/<artifactid>
        /<dependency>

        <dependency>
            <groupid>org.springframework.boot/<groupid>
            <artifactid>spring-boot-starter-quartz/<artifactid>
        /<dependency>

        <dependency>
            <groupid>com.alibaba/<groupid>
            <artifactid>druid-spring-boot-starter/<artifactid>
            <version>${druid.version}/<version>
        /<dependency>
        <dependency>
            <groupid>mysql/<groupid>
            <artifactid>mysql-connector-java/<artifactid>
        /<dependency>
        <dependency>
            <groupid>com.github.pagehelper/<groupid>
            <artifactid>pagehelper-spring-boot-starter/<artifactid>
            <version>${pagehelper.version}/<version>
        /<dependency>

        
        <dependency>
            <groupid>org.springframework.boot/<groupid>
            <artifactid>spring-boot-starter-logging/<artifactid>
            <exclusions>             

                <exclusion>
                    <groupid>*/<groupid>
                    <artifactid>*/<artifactid>
                /<exclusion>
            /<exclusions>
            <scope>test/<scope>     
        /<dependency>
        <dependency>
            <groupid>ch.qos.logback/<groupid>
            <artifactid>logback-classic/<artifactid>
        /<dependency>

        <dependency>
            <groupid>org.projectlombok/<groupid>
            <artifactid>lombok/<artifactid>
            <optional>true/<optional>
        /<dependency>
    /<dependencies>

    <build>
        <finalname>spring-boot-quartz/<finalname>
        <plugins>
            
            <plugin>
                <groupid>org.springframework.boot/<groupid>
                <artifactid>spring-boot-maven-plugin/<artifactid>
            /<plugin>
        /<plugins>
    /<build>
/<project>/<code>

application.xml

<code>server:
  port: 9001
  servlet:
    context-path: /quartz
spring:
  thymeleaf:
    mode: HTML
    cache: false
  #連接池配置
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    druid: 

      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/spring-boot-quartz?useSSL=false&useUnicode=true
      username: root
      password: 123456
      initial-size: 1                     #連接池初始大小
      max-active: 20                      #連接池中最大的活躍連接數
      min-idle: 1                         #連接池中最小的活躍連接數
      max-wait: 60000                     #配置獲取連接等待超時的時間
      pool-prepared-statements: true    #打開PSCache，並且指定每個連接上PSCache的大小
      max-pool-prepared-statement-per-connection-size: 20
      validation-query: SELECT 1 FROM DUAL
      validation-query-timeout: 30000
      test-on-borrow: false             #是否在獲得連接後檢測其可用性
      test-on-return: false             #是否在連接放回連接池後檢測其可用性
      test-while-idle: true             #是否在連接空閒一段時間後檢測其可用性
  quartz:
    #相關屬性配置
    properties:
      org:
        quartz:
          scheduler:
            instanceName: quartzScheduler
            instanceId: AUTO
          jobStore:
            class: org.quartz.impl.jdbcjobstore.JobStoreTX
            driverDelegateClass: org.quartz.impl.jdbcjobstore.StdJDBCDelegate
            tablePrefix: QRTZ_
            isClustered: false
            clusterCheckinInterval: 10000
            useProperties: false
          threadPool:
            class: org.quartz.simpl.SimpleThreadPool
            threadCount: 10
            threadPriority: 5
            threadsInheritContextClassLoaderOfInitializingThread: true
    #數據庫方式
    job-store-type: JDBC
    #初始化表結構 

    jdbc:
      initialize-schema: NEVER
#mybatis配置
mybatis:
  type-aliases-package: com.lee.quartz.entity
  mapper-locations: classpath:mybatis/mapper/*.xml
#分頁配置, pageHelper是物理分頁插件
pagehelper:
  #4.0.0以後版本可以不設置該參數，該示例中是5.1.4
  helper-dialect: mysql
  #啟用合理化，如果pageNum<1會查詢第一頁，如果pageNum>pages會查詢最後一頁
  reasonable: true
logging:
  level:
    com.lee.quartz.mapper: debug/<code>

這樣，quartz就配置好了，應用裡面直接用即可

JobController.java

<code>package com.lee.quartz.web;


import com.github.pagehelper.PageInfo;
import com.lee.quartz.common.Result;
import com.lee.quartz.entity.QuartzJob;
import com.lee.quartz.service.IJobService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/job")
public class JobController {
    private final static Logger LOGGER = LoggerFactory.getLogger(JobController.class);

    @Autowired
    private IJobService jobService;

    @SuppressWarnings({ "unchecked", "rawtypes" }) 

    @PostMapping("/add")
    public Result save(QuartzJob quartz){
        LOGGER.info("新增任務");
        Result result = jobService.saveJob(quartz);
        return result;
    }
    @PostMapping("/list")
    public PageInfo list(String jobName,Integer pageNo,Integer pageSize){
        LOGGER.info("任務列表");
        PageInfo pageInfo = jobService.listQuartzJob(jobName, pageNo, pageSize);
        return pageInfo;
    }

    @PostMapping("/trigger")
    public  Result trigger(String jobName, String jobGroup) {
        LOGGER.info("觸發任務");
        Result result = jobService.triggerJob(jobName, jobGroup);
        return result;
    }

    @PostMapping("/pause")
    public  Result pause(String jobName, String jobGroup) {
        LOGGER.info("停止任務");
        Result result = jobService.pauseJob(jobName, jobGroup);
        return result;
    }

    @PostMapping("/resume")
    public  Result resume(String jobName, String jobGroup) {
        LOGGER.info("恢復任務");
        Result result = jobService.resumeJob(jobName, jobGroup);
        return result;
    }

    @PostMapping("/remove")
    public  Result remove(String jobName, String jobGroup) {
        LOGGER.info("移除任務");
        Result result = jobService.removeJob(jobName, jobGroup);
        return result;
    }
}/<code>

JobServiceImpl.java

<code>package com.lee.quartz.service.impl;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo; 

import com.lee.quartz.common.Result;
import com.lee.quartz.entity.QuartzJob;
import com.lee.quartz.mapper.JobMapper;
import com.lee.quartz.service.IJobService;
import org.quartz.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class JobServiceImpl implements IJobService {

    @Autowired
    private Scheduler scheduler;

    @Autowired
    private JobMapper jobMapper;

    @Override
    public PageInfo listQuartzJob(String jobName, Integer pageNum, Integer pageSize) {
        PageHelper.startPage(pageNum, pageSize);
        List<quartzjob> jobList = jobMapper.listJob(jobName);
        PageInfo pageInfo = new PageInfo(jobList);
        return pageInfo;
    }

    @Override
    public Result saveJob(QuartzJob quartz){
        try {
            //如果是修改  展示舊的 任務
            if(quartz.getOldJobGroup() != null && !"".equals(quartz.getOldJobGroup())){
                JobKey key = new JobKey(quartz.getOldJobName(),quartz.getOldJobGroup());
                scheduler.deleteJob(key);
            }

            //構建job信息
            Class cls = Class.forName(quartz.getJobClassName()) ;
            cls.newInstance();
            JobDetail job = JobBuilder.newJob(cls).withIdentity(quartz.getJobName(),
                    quartz.getJobGroup())
                    .withDescription(quartz.getDescription()).build();
            // 觸發時間點
            CronScheduleBuilder cronScheduleBuilder = CronScheduleBuilder.cronSchedule(quartz.getCronExpression().trim());
            Trigger trigger = TriggerBuilder.newTrigger().withIdentity("trigger"+quartz.getJobName(), quartz.getJobGroup())
                    .startNow().withSchedule(cronScheduleBuilder).build();
            //交由Scheduler安排觸發
            scheduler.scheduleJob(job, trigger); 

        } catch (Exception e) {
            e.printStackTrace();
            return Result.error();
        }
        return Result.ok();
    }

    @Override
    public Result triggerJob(String jobName, String jobGroup) {
        JobKey key = new JobKey(jobName,jobGroup);
        try {
            scheduler.triggerJob(key);
        } catch (SchedulerException e) {
            e.printStackTrace();
            return Result.error();
        }
        return Result.ok();
    }

    @Override
    public Result pauseJob(String jobName, String jobGroup) {
        JobKey key = new JobKey(jobName,jobGroup);
        try {
            scheduler.pauseJob(key);
        } catch (SchedulerException e) {
            e.printStackTrace();
            return Result.error();
        }
        return Result.ok();
    }

    @Override
    public Result resumeJob(String jobName, String jobGroup) {
        JobKey key = new JobKey(jobName,jobGroup);
        try {
            scheduler.resumeJob(key);
        } catch (SchedulerException e) {
            e.printStackTrace();
            return Result.error();
        }
        return Result.ok();
    }

    @Override
    public Result removeJob(String jobName, String jobGroup) {
        try {
            TriggerKey triggerKey = TriggerKey.triggerKey(jobName, jobGroup);
            // 停止觸發器
            scheduler.pauseTrigger(triggerKey);
            // 移除觸發器 

            scheduler.unscheduleJob(triggerKey);
            // 刪除任務
            scheduler.deleteJob(JobKey.jobKey(jobName, jobGroup));
            System.out.println("removeJob:"+JobKey.jobKey(jobName));
        } catch (Exception e) {
            e.printStackTrace();
            return Result.error();
        }
        return Result.ok();
    }
}/<quartzjob>/<code>

主要就是以上文件，詳情請查看spring-boot-quartz

https://gitee.com/youzhibing/spring-boot-2.0.3/tree/master/spring-boot-quartz

工程裡面數據源用的druid，springboot默認也會將該數據源應用到quartz，如果想給quartz單獨配置數據源，可配合@QuartzDataSource來實現

最終效果如下

trigger狀態

org.quartz.impl.jdbcjobstore.Constants中存放了一些列的常量，源代碼如下

<code>/* 
 * All content copyright Terracotta, Inc., unless otherwise indicated. All rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 
 * use this file except in compliance with the License. You may obtain a copy 
 * of the License at 
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0 
 *   
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 
 * License for the specific language governing permissions and limitations 
 * under the License.
 * 
 */

package org.quartz.impl.jdbcjobstore;

/**
 * 

 * This interface can be implemented by any <code>{@link
 * org.quartz.impl.jdbcjobstore.DriverDelegate}/<code>
 * class that needs to use the constants contained herein.
 * 

 * 
 * @author 
 * @author James House
 */
public interface Constants {

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Constants.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    // Table names
    String TABLE_JOB_DETAILS = "JOB_DETAILS"; 


    String TABLE_TRIGGERS = "TRIGGERS";

    String TABLE_SIMPLE_TRIGGERS = "SIMPLE_TRIGGERS";

    String TABLE_CRON_TRIGGERS = "CRON_TRIGGERS";

    String TABLE_BLOB_TRIGGERS = "BLOB_TRIGGERS";

    String TABLE_FIRED_TRIGGERS = "FIRED_TRIGGERS";

    String TABLE_CALENDARS = "CALENDARS";

    String TABLE_PAUSED_TRIGGERS = "PAUSED_TRIGGER_GRPS";

    String TABLE_LOCKS = "LOCKS";

    String TABLE_SCHEDULER_STATE = "SCHEDULER_STATE";

    // TABLE_JOB_DETAILS columns names

    String COL_SCHEDULER_NAME = "SCHED_NAME";

    String COL_JOB_NAME = "JOB_NAME";

    String COL_JOB_GROUP = "JOB_GROUP";

    String COL_IS_DURABLE = "IS_DURABLE";

    String COL_IS_VOLATILE = "IS_VOLATILE";

    String COL_IS_NONCONCURRENT = "IS_NONCONCURRENT";

    String COL_IS_UPDATE_DATA = "IS_UPDATE_DATA";

    String COL_REQUESTS_RECOVERY = "REQUESTS_RECOVERY";

    String COL_JOB_DATAMAP = "JOB_DATA";

    String COL_JOB_CLASS = "JOB_CLASS_NAME";

    String COL_DESCRIPTION = "DESCRIPTION";

    // TABLE_TRIGGERS columns names
    String COL_TRIGGER_NAME = "TRIGGER_NAME";

    String COL_TRIGGER_GROUP = "TRIGGER_GROUP";

    String COL_NEXT_FIRE_TIME = "NEXT_FIRE_TIME";
 

    String COL_PREV_FIRE_TIME = "PREV_FIRE_TIME";

    String COL_TRIGGER_STATE = "TRIGGER_STATE";

    String COL_TRIGGER_TYPE = "TRIGGER_TYPE";

    String COL_START_TIME = "START_TIME";

    String COL_END_TIME = "END_TIME";

    String COL_PRIORITY = "PRIORITY";

    String COL_MISFIRE_INSTRUCTION = "MISFIRE_INSTR";

    String ALIAS_COL_NEXT_FIRE_TIME = "ALIAS_NXT_FR_TM";

    // TABLE_SIMPLE_TRIGGERS columns names
    String COL_REPEAT_COUNT = "REPEAT_COUNT";

    String COL_REPEAT_INTERVAL = "REPEAT_INTERVAL";

    String COL_TIMES_TRIGGERED = "TIMES_TRIGGERED";

    // TABLE_CRON_TRIGGERS columns names
    String COL_CRON_EXPRESSION = "CRON_EXPRESSION";

    // TABLE_BLOB_TRIGGERS columns names
    String COL_BLOB = "BLOB_DATA";

    String COL_TIME_ZONE_ID = "TIME_ZONE_ID";

    // TABLE_FIRED_TRIGGERS columns names
    String COL_INSTANCE_NAME = "INSTANCE_NAME";

    String COL_FIRED_TIME = "FIRED_TIME";

    String COL_SCHED_TIME = "SCHED_TIME";

    String COL_ENTRY_ID = "ENTRY_ID";

    String COL_ENTRY_STATE = "STATE";

    // TABLE_CALENDARS columns names
    String COL_CALENDAR_NAME = "CALENDAR_NAME";

    String COL_CALENDAR = "CALENDAR";

    // TABLE_LOCKS columns names
    String COL_LOCK_NAME = "LOCK_NAME";
 

    // TABLE_LOCKS columns names
    String COL_LAST_CHECKIN_TIME = "LAST_CHECKIN_TIME";

    String COL_CHECKIN_INTERVAL = "CHECKIN_INTERVAL";

    // MISC CONSTANTS
    String DEFAULT_TABLE_PREFIX = "QRTZ_";

    // STATES
    String STATE_WAITING = "WAITING";

    String STATE_ACQUIRED = "ACQUIRED";

    String STATE_EXECUTING = "EXECUTING";

    String STATE_COMPLETE = "COMPLETE";

    String STATE_BLOCKED = "BLOCKED";

    String STATE_ERROR = "ERROR";

    String STATE_PAUSED = "PAUSED";

    String STATE_PAUSED_BLOCKED = "PAUSED_BLOCKED";

    String STATE_DELETED = "DELETED";

    /**
     * @deprecated Whether a trigger has misfired is no longer a state, but 
     * rather now identified dynamically by whether the trigger's next fire 
     * time is more than the misfire threshold time in the past.
     */
    String STATE_MISFIRED = "MISFIRED";

    String ALL_GROUPS_PAUSED = "_$_ALL_GROUPS_PAUSED_$_";

    // TRIGGER TYPES
    /** Simple Trigger type. */
    String TTYPE_SIMPLE = "SIMPLE";

    /** Cron Trigger type. */
    String TTYPE_CRON = "CRON";

    /** Calendar Interval Trigger type. */
    String TTYPE_CAL_INT = "CAL_INT";

    /** Daily Time Interval Trigger type. */
    String TTYPE_DAILY_TIME_INT = "DAILY_I";

    /** A general blob Trigger type. */ 

    String TTYPE_BLOB = "BLOB";
}

// EOF/<code>

裡面有quartz的表名、各個表包含的列名、trigger狀態、trigger類型等內容。更多springboot內容，可以在Java知音公眾號回覆“”springboot聚合。

狀態包括

• WAITING：等待中
• ACQUIRED：將觸發，此時還未到trigger真正的觸發時刻
• EXECUTING：觸發，亦可理解成執行中，trigger真正的觸發時刻
• COMPLETE：完成，不再觸發
• BLOCKED：受阻，不允許併發執行job時會出現（@DisallowConcurrentExecution）
• ERROR：出錯
• PAUSED：暫停中
• PAUSED_BLOCKED：暫停受阻，不允許併發執行job時會出現（@DisallowConcurrentExecution）
• DELETED：已刪除
• MISFIRED：觸發失敗，已棄用，有另外的替代方式

狀態變化流程圖如下所示

trigger的初始狀態是WAITING，處於WAITING狀態的trigger等待被觸發。調度線程會不停地掃triggers表，根據NEXT_FIRE_TIME提前拉取即將觸發的trigger，如果這個trigger被該調度線程拉取到，它的狀態就會變為ACQUIRED。

因為是提前拉取trigger，並未到達trigger真正的觸發時刻，所以調度線程會等到真正觸發的時刻，再將trigger狀態由ACQUIRED改為EXECUTING。如果這個trigger不再執行，就將狀態改為COMPLETE,否則為WAITING，開始新的週期。如果這個週期中的任何環節拋出異常，trigger的狀態會變成ERROR。如果手動暫停這個trigger，狀態會變成PAUSED。

總結

Quartz作為一個開源的作業調度框架，提供了巨大的靈活性而不犧牲簡單性。我們能夠用它來為執行一個作業而創建簡單的或複雜的調度。它有很多特徵，如：數據庫、集群、插件、JavaMail支持，EJB作業預構建，支持cron-like表達式等等；

springboot集成quartz非常簡單，最簡單的情況下只需要引入依賴我們就可以享受quartz提供的功能，springboot默認會幫我們配置好quartz；當然我們也可以自定義配置來實現quartz的定製；

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