search
HomeJavajavaTutorialHow Springboot implements scheduled tasks through Scheduled

Scheduled tasks generally exist in medium and large enterprise-level projects. In order to reduce the pressure on servers and databases, time periods are often used to complete certain business logic. The more common ones are push callbacks from financial service systems. Generally, payment system orders will continuously call back when they do not receive successful callback return content. Such callbacks are usually completed by scheduled tasks. There is also the generation of reports. We usually complete this operation when the number of customer visits is too small, which is often in the early morning. At this time, we can also use scheduled tasks to complete the logic. SpringBoot has built-in scheduled tasks for us. We only need an annotation to enable timing for our use.

In development, scheduled tasks are a common function. It is actually very simple to develop scheduled tasks under spring boot. The specific code is as follows:

1. Configure dependency package pom.xml

Since the default maven warehouse is often inaccessible, Alibaba Cloud's maven warehouse image is used here.

<?xml  version="1.0" encoding="UTF-8"?>
<project>
  <modelversion>4.0.0</modelversion>

  <groupid>com.example</groupid>
  <artifactid>demo</artifactid>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>spring-boot-scheduled</name>
  <description>Demo project for Spring Boot</description>

  <!-- 阿里云maven仓库 -->
  <repositories>
    <repository>
      <id>public</id>
      <name>aliyun nexus</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <releases>
        <enabled>true</enabled>
      </releases>
    </repository>
  </repositories>
  <pluginrepositories>
    <pluginrepository>
      <id>public</id>
      <name>aliyun nexus</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <releases>
        <enabled>true</enabled>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginrepository>
  </pluginrepositories>

  <parent>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-parent</artifactid>
    <version>1.4.5.RELEASE</version>
    <relativepath></relativepath> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceencoding>UTF-8</project.build.sourceencoding>
    <project.reporting.outputencoding>UTF-8</project.reporting.outputencoding>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-web</artifactid>
    </dependency>

    <dependency>
      <groupid>org.projectlombok</groupid>
      <artifactid>lombok</artifactid>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-test</artifactid>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-maven-plugin</artifactid>
      </plugin>
    </plugins>
  </build>
</project>

2. Customized task scenarios

Scheduled task implementation provides scenarios such as fixed period, fixed period delay interval and set time point execution. Use the @Scheduled annotation for annotation.

ExampleTimer.java

package com.example;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component
public class ExampleTimer {
	SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
	@Scheduled(fixedRate = 10000)
	    public void timerRate() {
		System.out.println(dateFormat.format(new Date()));
	}
	//第一次延迟1秒执行,当执行完后2秒再执行
	@Scheduled(initialDelay = 1000, fixedDelay = 2000)
	    public void timerInit() {
		System.out.println("init : "+dateFormat.format(new Date()));
	}
	//每天20点16分50秒时执行
	@Scheduled(cron = "50 16 20 * * ?")
	    public void timerCron() {
		System.out.println("current time : "+ dateFormat.format(new Date()));
	}
}

3. Start the application

To start the program, you need to add the @EnableScheduling annotation.

SpringBootScheduledApplication.java

package com.example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
@EnableScheduling
public class SpringBootScheduledApplication {
	public static void main(String[] args) {
		SpringApplication.run(SpringBootScheduledApplication.class, args);
	}
}

4. Output result

20:16:27
init : 20:16:28
init : 20:16:30
init : 20:16:32
init : 20:16:34
init : 20:16:36
20:16:37
init : 20:16:38
init : 20:16:40
init : 20:16:42
init : 20:16:44
init : 20:16:46
20:16:47
init : 20:16:48
current time : 20:16:50
init : 20:16:50
init : 20:16:52
init : 20:16:54

The above is the detailed content of How Springboot implements scheduled tasks through Scheduled. For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:亿速云. If there is any infringement, please contact admin@php.cn delete
How does the JVM handle differences in operating system APIs?How does the JVM handle differences in operating system APIs?Apr 27, 2025 am 12:18 AM

JVM handles operating system API differences through JavaNativeInterface (JNI) and Java standard library: 1. JNI allows Java code to call local code and directly interact with the operating system API. 2. The Java standard library provides a unified API, which is internally mapped to different operating system APIs to ensure that the code runs across platforms.

How does the modularity introduced in Java 9 impact platform independence?How does the modularity introduced in Java 9 impact platform independence?Apr 27, 2025 am 12:15 AM

modularitydoesnotdirectlyaffectJava'splatformindependence.Java'splatformindependenceismaintainedbytheJVM,butmodularityinfluencesapplicationstructureandmanagement,indirectlyimpactingplatformindependence.1)Deploymentanddistributionbecomemoreefficientwi

What is bytecode, and how does it relate to Java's platform independence?What is bytecode, and how does it relate to Java's platform independence?Apr 27, 2025 am 12:06 AM

BytecodeinJavaistheintermediaterepresentationthatenablesplatformindependence.1)Javacodeiscompiledintobytecodestoredin.classfiles.2)TheJVMinterpretsorcompilesthisbytecodeintomachinecodeatruntime,allowingthesamebytecodetorunonanydevicewithaJVM,thusfulf

Why is Java considered a platform-independent language?Why is Java considered a platform-independent language?Apr 27, 2025 am 12:03 AM

JavaachievesplatformindependencethroughtheJavaVirtualMachine(JVM),whichexecutesbytecodeonanydevicewithaJVM.1)Javacodeiscompiledintobytecode.2)TheJVMinterpretsandexecutesthisbytecodeintomachine-specificinstructions,allowingthesamecodetorunondifferentp

How can graphical user interfaces (GUIs) present challenges for platform independence in Java?How can graphical user interfaces (GUIs) present challenges for platform independence in Java?Apr 27, 2025 am 12:02 AM

Platform independence in JavaGUI development faces challenges, but can be dealt with by using Swing, JavaFX, unifying appearance, performance optimization, third-party libraries and cross-platform testing. JavaGUI development relies on AWT and Swing, which aims to provide cross-platform consistency, but the actual effect varies from operating system to operating system. Solutions include: 1) using Swing and JavaFX as GUI toolkits; 2) Unify the appearance through UIManager.setLookAndFeel(); 3) Optimize performance to suit different platforms; 4) using third-party libraries such as ApachePivot or SWT; 5) conduct cross-platform testing to ensure consistency.

What aspects of Java development are platform-dependent?What aspects of Java development are platform-dependent?Apr 26, 2025 am 12:19 AM

Javadevelopmentisnotentirelyplatform-independentduetoseveralfactors.1)JVMvariationsaffectperformanceandbehavioracrossdifferentOS.2)NativelibrariesviaJNIintroduceplatform-specificissues.3)Filepathsandsystempropertiesdifferbetweenplatforms.4)GUIapplica

Are there performance differences when running Java code on different platforms? Why?Are there performance differences when running Java code on different platforms? Why?Apr 26, 2025 am 12:15 AM

Java code will have performance differences when running on different platforms. 1) The implementation and optimization strategies of JVM are different, such as OracleJDK and OpenJDK. 2) The characteristics of the operating system, such as memory management and thread scheduling, will also affect performance. 3) Performance can be improved by selecting the appropriate JVM, adjusting JVM parameters and code optimization.

What are some limitations of Java's platform independence?What are some limitations of Java's platform independence?Apr 26, 2025 am 12:10 AM

Java'splatformindependencehaslimitationsincludingperformanceoverhead,versioncompatibilityissues,challengeswithnativelibraryintegration,platform-specificfeatures,andJVMinstallation/maintenance.Thesefactorscomplicatethe"writeonce,runanywhere"

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.