应需求添加每天定时生成索引

无非就是两种方法
1：Servlet
2: Listener
 
Servlet:

<!---->package 

import org.apache.log4j.Logger;
import javax.servlet.http.HttpServlet;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

/**
 * @author martin
 */
public class LuceneTimerServlet extends HttpServlet {
    private static Logger logger = Logger.getLogger(LuceneTimerServlet.class);
    private static Timer timer;

    static {
        timer = new Timer(true);
        timer.schedule(new TimerTask() {
            public void run() {
                System.out.println("开始创建索引@" + getTime(Calendar.getInstance()));
                TaxDocIndexer indexer = new TaxDocIndexer();
                indexer.setFirstRun(Boolean.TRUE);
                indexer.fetch();
                System.out.println("索引创建成功@" + getTime(Calendar.getInstance()));
            }
        },
                getFirstTime(),
                getPeriod()
        );
    }


    public void destroy() {
        logger.debug("LuceneTimerServlet.destroy() begin");
        timer.cancel();
    }

    /**
     * 从服务启动起算，第二天零时开始执行
     *
     * @return Timer第一次执行时间
     */
    private static Date getFirstTime() {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        logger.debug("开始执行时间：" + getTime(calendar));
        return calendar.getTime();
    }

    /**
     * @param calendar
     * @return formated time string
     */
    private static String getTime(Calendar calendar) {
        return new StringBuffer()
                .append(calendar.get(Calendar.YEAR)).append("年")
                .append(calendar.get(Calendar.MONTH) + 1).append("月")
                .append(calendar.get(Calendar.DAY_OF_MONTH)).append("日  ")
                .append(calendar.get(Calendar.HOUR_OF_DAY)).append("时")
                .append(calendar.get(Calendar.MINUTE)).append("分")
                .append(calendar.get(Calendar.SECOND)).append("秒")
                .toString();
    }

    /**
     * 计算一天的时间间隔
     * 一天24小时×每小时60分×每分60秒×1000
     *
     * @return 一天时间
     */
    private static long getPeriod() {
        return 86400000;
    }
}
配置web.xml

<!---->    <servlet>
        <servlet-name>luceneTimerServlet</servlet-name>
        <servlet-class>sompackage.servlet.LuceneTimerServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

如果采用Listener,则是：

<!---->    <listener>    
        <listener-class>sompackage.servlet.LuceneTimerServlet</listener-class>
    </listener>

分享到：

Hibernate Annotations(1) | 名人，垃圾！

• 2006-03-08 12:42
• 浏览 1134
• 评论(0)
• 查看更多