quartz定时器的使用

1.下载Quartz，我下载的是1.8.5，将quartz-all-1.8.5拷贝到web项目的lib目录中。除此之外还需要将以下

    jta-1.1
    log4j-1.2.14
    slf4j-api-1.6.1
    slf4j-nop-1.5.2
    slf4j-log4j12-1.6.1
    commons-beanutils-1.7.0.jar
    commons-collections-3.1.jar
    commons-logging-1.0.4.jar

拷贝到web项目的lib目录中，不然会启动tomcat会产生如下错误：

#缺少log4j-1.2.14,slf4j-api-1.6.1,slf4j-log4j12-1.6.1
java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
#缺少jta-1.1
javax/transaction/UserTransaction at java.lang.Class.getDeclaredMethods0(Native Method)

2.新建一个任务类,需要实现Quartz的Job接口。

package me.hujun.demo.quartz;

import java.util.Date;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

public class MyJob implements Job {
        @Override
        public void execute(JobExecutionContext arg0) throws JobExecutionException {
                System.out.println("Start MyJob at " + new Date());
        }

}

3.在src目录下新建quartz.properties,这个文件可以直接充quartz的jar包中拷贝。但需要加入两行新的内容,分别用来指定jobInitializer class和jobInitializer需要解析的配置文件路径（清单的最后两行配置）。

#============================================================================ 
# Configure Main Scheduler Properties   
#============================================================================ 
org.quartz.scheduler.instanceName = TestScheduler 
org.quartz.scheduler.instanceId = AUTO 
#============================================================================ 
# Configure ThreadPool   
#============================================================================ 
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool 
org.quartz.threadPool.threadCount = 3 
org.quartz.threadPool.threadPriority = 5 
#============================================================================ 
# Configure JobStore   
#============================================================================ 
#org.quartz.jobStore.misfireThreshold = 60000 
org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore 
#============================================================================ 
# Configure Plugins  
#============================================================================ 
#org.quartz.plugin.triggHistory.class = org.quartz.plugins.history.LoggingJobHistoryPlugin 
#org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.JobInitializationPlugin 
#org.quartz.plugin.jobInitializer.fileNames = quartz_jobx.xml 
#org.quartz.plugin.jobInitializer.overWriteExistingJobs = true 
#org.quartz.plugin.jobInitializer.failOnFileNotFound = true 
#org.quartz.plugin.jobInitializer.scanInterval = 10 
#org.quartz.plugin.jobInitializer.wrapInUserTransaction =false 
 
#org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.JobInitializationPlugin 
org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.XMLSchedulingDataProcessorPlugin  
org.quartz.plugin.jobInitializer.fileNames = quartz_jobs.xml 
org.quartz.plugin.jobInitializer.failOnFileNotFound = true 
org.quartz.plugin.shutdownhook.class = org.quartz.plugins.management.ShutdownHookPlugin 
org.quartz.plugin.shutdownhook.cleanShutdown =true 

4.编写quartz_job.xml（上述清单中org.quartz.plugin.jobInitializer.fileNames的值），配置job和trigger。
<?xml version="1.0" encoding="UTF-8"?>
<job-scheduling-data xmlns="http://www.quartz-scheduler.org/xml/JobSchedulingData"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.quartz-scheduler.org/xml/JobSchedulingData http://www.quartz-scheduler.org/xml/job_scheduling_data_1_8.xsd"
  version="1.8">
<schedule>
  <job>
   <name>my_job</name>
   <group>DEFAULT</group>
   <description>
    this is HelloWorld......
   </description>
   <job-class>org.hzy.jobs.My_Job</job-class>
  </job>
  <trigger>
<cron>
  <name>my_job_trigger</name>
  <job-name>my_job</job-name>
  <cron-expression>0/10 * * * * ?</cron-expression>
</cron>
  </trigger>
</schedule>
</job-scheduling-data>
5.修改web.xml。

<servlet>
                <servlet-name>quartz</servlet-name>
                <servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
                <init-param>
                        <param-name>config-file</param-name>
                        <param-value>/quartz.properties</param-value>
                </init-param>
                <init-param>
                        <param-name>shutdown-on-unload</param-name>
                        <param-value>true</param-value>
                </init-param>

     <init-param> 
         <param-name>start-scheduler-on-load</param-name> 
         <param-value>true</param-value> 
     </init-param>
                <load-on-startup>1</load-on-startup>
        </servlet>

或启用监听器QuartzInitializerListener

<context-param>
         <param-name>config-file</param-name>
         <param-value>/some/path/my_quartz.properties</param-value>
     </context-param>
     <context-param>
         <param-name>shutdown-on-unload</param-name>
         <param-value>true</param-value>
     </context-param>
     <context-param>
         <param-name>start-scheduler-on-load</param-name>
         <param-value>true</param-value>
     </context-param>
    
     <listener>
         <listener-class>
             org.quartz.ee.servlet.QuartzInitializerListener
         </listener-class>
     </listener>


6.启动tomcat