detectfilenamefilter.java

java编写的监控一个文件夹里面有没有新的excel文件放入

/**
 * 
 */
package com.justin.detect;

import java.io.File;
import java.io.FilenameFilter;

/**
 * @author Justin
 *
 *  过滤监测文件
 */
public class DetectFileNameFilter implements FilenameFilter {
	
	private String fileExt;
	
	public DetectFileNameFilter(String fileExt){
		this.fileExt = fileExt;
	}
	
	/* (non-Javadoc)
	 * @see java.io.FilenameFilter#accept(java.io.File, java.lang.String)
	 */
	public synchronized boolean accept(File file, String filename) {
		// 查询是否有新文件
		String theName = filename.trim();
	    int index = theName.lastIndexOf(".");
	    if (index > 0 && index < theName.length() - 1) {
	      String ext = theName.substring(index+1, theName.length());
	      if (ext.equals(fileExt)) {	
	        return true;
	      }
	    }
		return false;
	}

}