<h1 style="margin:0px; padding:0px; font-family:Arial; line-height:26px; text-align:left"> <span lang="EN-US" style="font-size:10pt; font-family:宋体; color:rgb(48,48,48)">一 JOB State</span></h1>
<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Arial; font-size:14px; line-height:26px; text-align:left"> 在通过<span lang="EN-US" style="font-size:10pt; font-family:宋体; color:rgb(48,48,48)">MethodInvokingJobDetailFactoryBean在运行中动态生成的Job，配置的xml文件有个concurrent属性，表示job是否可以并行运行：如果一个job的业务处理发费的时间超过了job的启动的间隔时间（repeatInterval)，这个属性非常有用。如果为false，那么，在这种情况下，当前job还在运行，那么下一个job只能延时运行。如果为true，那么job就会并行运行。在实际的应用中应该配置为true/false，要根据需要了（废话）。</span></p>
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<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Arial; font-size:14px; line-height:26px; text-align:left"> <span lang="EN-US" style="font-size:10pt; font-family:宋体; color:rgb(48,48,48)">如果通过继承QuartzJobBean实现job的话，默认情况下QuartzJobBean是implements org.quartz.Job接口的，也就是说job示例是stateless的，会出现前面所述的并行情况。而代码中却要求job任务必需串行，解决办法：在job子类中继续implements org.quartz.StatefulJob。那么这个job实例变成了Stateful，job任务也就是串行的了。</span></p>
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<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Arial; font-size:14px; line-height:26px; text-align:left"> <span lang="EN-US" style="font-size:10pt; font-family:宋体; color:rgb(48,48,48)">注：</span></p>
<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Arial; font-size:14px; line-height:26px; text-align:left"> <span lang="EN-US" style="font-size:10pt; font-family:宋体; color:rgb(48,48,48)">在Quartz中，如果实现org.quartz.Job接口，那么这个job是stateless的，job实例的参数不能在多个任务之间共享，如果实现org.quartz.StatefulJob，这个job是个单例的，job实例的属性可以从当前任务传递到下一个任务。</span></p>
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<h1 style="margin:0px; padding:0px; font-family:Arial; line-height:26px; text-align:left"> <span lang="EN-US" style="font-size:10pt; font-family:宋体; color:rgb(48,48,48)">二 动态设定Trigger参数</span></h1>
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<span style="font-size:12px">什么是动态定时任务：是由客户制定生成的，服务端只知道该去执行什么任务，但任务的定时是不确定的（是由客户制定）。</span>
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<span style="font-size:12px">这样总不能修改配置文件每定制个定时任务就增加一个trigger吧，即便允许客户修改配置文件，但总需要重新启动web服务啊，研究了下Quartz在Spring中的动态定时，发现<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean" ></span>
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<span style="font-size:12px"> <property name="jobDetail" ref="schedulerJobDetail"/></span>
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