本文主要是介绍java 定时任务quartz-1.5.2.jar 超简单使用,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
1)引入依赖
<!-- https://mvnrepository.com/artifact/quartz/quartz -->
<dependency>
<groupId>quartz</groupId>
<artifactId>quartz</artifactId>
<version>1.5.2</version>
</dependency>
2)编写定时要完成的工作(这里有个简单的HTTP请求)
package demo;
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
public class TestJob implements Job {
@Override
public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
System.out.println("下次执行时间为:" +jobExecutionContext.getNextFireTime());
try {
req();
} catch (UnirestException e) {
e.printStackTrace();
}
}
private void req() throws UnirestException {
Unirest.setTimeouts(0, 0);
HttpResponse<String> response =
Unirest.get("http://127.0.0.1:8080/").header("Cookie", "Cookie_1=value").asString();
System.out.println("response = " + response.getStatusText());
}
}
quartz定时任务三板斧
package demo;
import org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;
import java.text.ParseException;
public class CrontabForJava {
public static void main(String[] args) throws ParseException {
// 1)定时做什么任务
JobDetail jobDetail = new JobDetail("name", "group", TestJob.class); // 任务名,任务组,任务执行类
// 2) Trigger 什么时候去做
Trigger trigger2 = null;
// trigger2 = new SimpleTrigger("name", "group");
trigger2 = new CronTrigger("name","group", "0 */1 * * * ?");//和linux Crontab 不同 是从秒开始的
// 3) Scheduler 任务调度 你什么时候需要去做什么事
Scheduler sch;
try {
sch = StdSchedulerFactory.getDefaultScheduler();
sch.scheduleJob(jobDetail, trigger2);
sch.start();
} catch (SchedulerException e) {
e.printStackTrace();
}
}
}
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