Specific use of several timers of java 4 kinds of of
- 2021-11-10 09:41:36
- OfStack
2.quartz
3. Use Timer
4. Use thread control
In summary 1, I have used four types of timers: @ Scheduled annotation, quartz, new Timer (). schedule, using thread control.
1. @ Scheduled annotations
The @ Scheduled annotation is the easiest way to do this is to enable the timer and add annotations to the method.
Add to the spring configuration:
<!-- Enable annotation timer -->
<task:annotation-driven />
Add annotations to the specific methods @Scheduled
@Scheduled(cron = "0 0 * * * ? ")
public void myTask(){
// Timing task ......
}
2.quartz
quartz uses a configurable way to configure all timers in another xml file. The steps are as follows:
1. Create a configuration file for spring: spring-quartz. xml
2. job for defining work tasks
3. Define the trigger Trigger and bind it to job
4. Define the scheduler and register Trigger with scheduler
<bean id="myTask" class="cn.coolwind.MyTask"/>
<!-- 1. Define work tasks job -->
<bean id="testJob" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<!-- Class of timer -->
<property name="targetObject" ref="myTask"></property>
<!-- Methods that need to be executed regularly -->
<property name="targetMethod" value="test"></property>
<property name="concurrent" value="false"></property>
</bean>
<!-- 2. Define triggers Trigger And with Job Binding -->
<bean id="testJobTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
<property name="jobDetail" ref="testJob"/>
<!-- Set the timing execution time as needed -->
<property name="cronExpression" value="0 0/5 * * * ?" />
</bean>
<!-- 3. Define the scheduler and set the trigger Register in -->
<bean name="quartzScheduler" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="triggers">
<list>
<ref local="testJobTrigger" />
</list>
</property>
</bean>
Finally, remember to write xml into web. xml!
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:applicationContext.xml,
classpath:log4j.xml,
classpath:spring-quartz.xml
</param-value>
</init-param>
3. Use Timer
schedule and schedule using Timer have three parameters:
schedule(TimerTask task, long delay, long period)
The first is a timed task, which can rewrite the run method of TimerTask according to business needs;
The second is delayed start, in milliseconds;
How often does the third bit run, in milliseconds;
new Timer().schedule(new TimerTask() {
@Override
public void run() {
try {
//do Something
} catch (Exception e) {
e.printStackTrace();
}
}
},0,5L * 60 * 1000);
4. Use thread control
Using threads to control is more flexible 1, you can judge when to run and when to stop according to your own needs, which requires a certain understanding of the threads of java.
public class TaskTest {
private static final ExecutorService pool = Executors.newFixedThreadPool(5);// Thread pool
public static final TaskTest me = new TaskTest();
public final int[] arr = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9};
public static void main(String[] args) {
me.start();
}
private void start() {
pool.execute(new Runnable() {
@Override
public void run() {
while (true) {
try {
for (int i = 0; i < arr.length; i++) {
if (1 == arr[i]) {
System.out.println("start!");
Thread.sleep(1*1000L);
}
if (6 == arr[i]) {
System.out.println("stop!");
Thread.sleep(5*1000L);
}
System.out.println(arr[i]);
if (9 == arr[i]) {
System.out.println("end!");
Thread.sleep(5*1000L);
}
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
}
}