lucene入门二[如何创建索引和关键字查询]
1、起一个线程爬取指定目录下的各类文档，建立索引。

3、定时执行爬虫任务。
package org.autumn.lucene.scheduler;import java.util.Date;import java.util.Timer;import org.autumn.lucene.spider.SpiderThread;public class SpiderScheduler {private static final SpiderScheduler _INSTANCE = new SpiderScheduler();private Timer timer = null;private static final long HALF_AN_HOUR = 30 * 60 * 1000;private SpiderScheduler() {timer = new Timer();}public static SpiderScheduler getInstance() {return _INSTANCE;}public void start() {timer.schedule(new SpiderThread(), new Date(), HALF_AN_HOUR);}public void stop() {timer.cancel();}public static void main(String[] args) {_INSTANCE.start();}}