QuartZ在Web中的应用

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

1. jta-1.1
2. log4j-1.2.14
3. slf4j-api-1.6.1
4. slf4j-nop-1.5.2
   
5. slf4j-log4j12-1.6.1
6. commons-beanutils-1.7.0.jar
   
7. commons-collections-3.1.jar
   
8. 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  
#如果这里不指定，默认会读取WEB-INFO/CLASSES目录下的quartz_jobs.xml文件，名称不能改变  
#如果有多个job xml文件，使用","隔开  
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>