1, regular tasks common Java class that comes java.util.Timer
timer: Configuration is too much trouble, time delay problem
timertask: not recommended
2, Quartz frame
simpler configuration
xml or annotation
3, SpringBoot manner using annotations opening timing Task
1) Start the class which @EnableScheduling opening timing of the task, auto scan
2) traffic class annotated timer task is to scan the container @Component
3) a method of performing a timing annotate @Scheduled (fixedRate = 2000 ) performed regularly once
Not much to say directly on the code
@Component //让Spring 扫描到这个
@PropertySource("classpath:application.yml") // 配置文件的路径
@ConfigurationProperties(prefix = "task") // 映射配置文件里面的那个节点
@EnableScheduling // 开启定时任务
public class TaskTest {
@Scheduled(cron = "${cron.time}") //@Scheduled 那个方法开启定时任务 cron = "${cron.time}" 任务的时间
public void printTime(){
System.err.println("当前时间："+new Date());
}
}This OK
@PropertySource("classpath:application.yml")
I used this idea when there will be a problem, said classpath not found here need to add a jar in the pom file
<!--配置文件处理-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>@Scheduled(cron = "${cron.time}")
This one has more attributes cron is a form of expression, as well as with many options such as
@Scheduled(fixedRate = 2000)@Scheduled(fixedRateString = "2000")@Scheduled(fixedDelay = 2000)@Scheduled(fixedDelayString = "2000")fixedRate This is two seconds to perform a complete regardless of whether the implementation of the following
fixedDelay This is two seconds and then performed once but the following method will wait for execution is finished
cron:
time: "*/2 * * * * *""* / 2 * * * * *" indicates 2 seconds to perform a
There is a webmaster tool can match the time
