java压缩与解压文件

package com.aastocks.util.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/* 
* @author steven.wu
* @since 2009.8.11
* @description read and write zip file。
*/
public class ZipFilesCompressed {
	public ZipFilesCompressed() {
		// TODO Auto-generated constructor stub
	}
	public static void putZipEntry(String zipOutName, File srcFile) throws Exception {
		if(srcFile.exists()){
			ZipOutputStream zipOut=new ZipOutputStream(new FileOutputStream(new File(zipOutName)));
			FileInputStream in = new FileInputStream(srcFile);
			ZipEntry zipEntry = new ZipEntry(srcFile.getName());
			zipOut.setLevel(Deflater.BEST_COMPRESSION);
			zipOut.putNextEntry(zipEntry);

			int len;
			byte[] buffer = new byte[18024];
			while ((len = in.read(buffer)) > 0) {
				zipOut.write(buffer, 0, len);
			}
			zipOut.closeEntry();
			zipOut.close();
			in.close();
		}
	}
	public static void UnZipEntry(File zipFileName,String outFilePath) throws Exception {
		ZipInputStream  zipIn=new ZipInputStream(new FileInputStream(zipFileName));
		ZipEntry zipEntry = zipIn.getNextEntry();
		if(zipIn.available()>0){
			if(!new File(outFilePath).exists()){
				new File(outFilePath).mkdir();
			}
			FileOutputStream fos = new FileOutputStream(new File(outFilePath+zipFileName.separator+zipEntry.getName()));

			int len;
			byte[] buffer = new byte[18024];
			while ((len = zipIn.read(buffer)) > 0) {
				fos.write(buffer, 0, len);
			}
			fos.close();
			zipIn.closeEntry();
			zipIn.close();
		}
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String s="d:/aa.pdf";
		String unZipFile="e:/bin/";
		String outName="bin.zip";
		try{
			putZipEntry(outName,new File(s));
			UnZipEntry(new File("d:/"+outName),unZipFile);
		}catch(Exception e){
			e.printStackTrace();
		}
	}

}