Spring's timing tasks and asynchronous methods

1. Example of use

1. Create a java project and introduce spring-related jar packages (omitted)

2. Add the following configuration to the spring configuration file:

<task:annotation-driven/>

<context:component-scan base-package="com.tuozixuan.task"/>

3. Write the following sample code and run

package com.tuozixuan.task;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component("myTask")
public class MyTask
{
    @Scheduled(cron="0 0/5 10-12 * * ?")
    public void execute()
    {
        String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
        System.out.println("[" + date + "]execute task...");
    }
    
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"spring.xml"});
    }
}

2. Detailed explanation of spring timing tasks

1. @Scheduled configuration

@Scheduled(fixedRate=1000), fixedRate indicates that this method needs to be called periodically every specified number of milliseconds.

@Scheduled(fixedDelay=2000), fixedDelay is used to specify the interval between method calls (the interval between the completion of one call and the start of the next call).

@Scheduled(cron="0 0/5 10-12 * * ?") cron is used to specify when this method is called.

cron settings:

1) Seconds (0-59)

2) Minutes (0-59)

3) Hours (0-23)

4) Day of the month (0-31)

5) Month (1-12 or JAN-DEC)

6) Day of the week (1-7 or SUN-SAT)

7) Year (1970-2099)

Each element can be explicitly specified as a value (such as 3), a range ( such as 2-5), a list ( such as 2,4,7), or a wildcard (such as *).

The day of the month summary and the day of the week are mutually exclusive, you can set a question mark (?) to indicate which field you do not want to set

3. Asynchronous method

1. Annotate the bean method with @Async to make the method an asynchronous execution method. The code example is as follows:

package com.tuozixuan.task;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Component("myTask")
public class MyTask
{
    
    @Async
    public void executeAsync()
    {
        System.out.println("async execute task start...");
        try
        {
            Thread.sleep(5000);
        }
        catch (InterruptedException e)
        {
            e.printStackTrace ();
        }
        System.out.println("async execute task end...");
    }
    
    public static void main(String[] args)
    {

        ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"spring.xml"});
        
        MyTask myTask =  context.getBean("myTask", MyTask.class);
        myTask.executeAsync();
        System.out.println("main...");
    }
}

Spring's timing tasks and asynchronous methods

Guess you like