摘要：
在开发中，定时任务是常见的功能，在springboot下开发定时任务其实很简单，具体代码如下：1、配置依赖包pom.xml由于默认的maven仓库经常访问不了，这里采用了阿里云的maven仓库镜像。--阿里云maven仓库--˃publicaliyunnexushttp://maven.aliyun.com/nexus/content/groups/public/truepublicaliyunnexushttp://maven.aliyun.com/nexus/content/groups/public/truefalseorg.springframework.bootspring-boot-starter-parent1.4.5.RELEASEUTF-8UTF-81.8org.springframework.bootspring-boot-starter-weborg.projectlomboklomboktrueorg.springframework.bootspring-boot-starter-testtestorg.springframework.bootspring-boot-maven-plugin2、定制任务场景定时任务实现，提供固定周期、固定周期延迟间隔和制定时间点执行等场景。采用@Scheduled注解进行标注。
在开发中，定时任务是常见的功能，在spring boot 下开发定时任务其实很简单，具体代码如下：
1、配置依赖包pom.xml
由于默认的maven仓库经常访问不了，这里采用了阿里云的maven仓库镜像。
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <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 /> <!--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、定制任务场景
定时任务实现，提供固定周期、固定周期延迟间隔和制定时间点执行等场景。采用@Scheduled注解进行标注。
ExampleTimer.java
packagecom.example; importjava.text.SimpleDateFormat; importjava.util.Date; importorg.springframework.scheduling.annotation.Scheduled; importorg.springframework.stereotype.Component; @Component public classExampleTimer { SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss"); @Scheduled(fixedRate = 10000) public voidtimerRate() { System.out.println(dateFormat.format(newDate())); } //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 voidtimerInit() { System.out.println("init : "+dateFormat.format(newDate())); } //每天20点16分50秒时执行 @Scheduled(cron = "50 16 20 * * ?") public voidtimerCron() { System.out.println("current time : "+ dateFormat.format(newDate())); } }
3、启动应用程序
启动程序，需要增加@EnableScheduling注解.
SpringBootScheduledApplication.java
packagecom.example; importorg.springframework.boot.SpringApplication; importorg.springframework.boot.autoconfigure.SpringBootApplication; importorg.springframework.scheduling.annotation.EnableScheduling; @SpringBootApplication @EnableScheduling public classSpringBootScheduledApplication { public static voidmain(String[] args) { SpringApplication.run(SpringBootScheduledApplication.class, args); } }
4、输出结果
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