来自: http://beansoft.java-cn.org/Wiki.jsp?page=Beansoft.jar.ZipUtil

用 Java 打包目录为 ZIP 文件

其实还有其它的功能, 例如创建新 ZIP, 添加文件, 添加目录等, 下一步再加上. 这个类主要目的是为了便于备份 beansoft.java-cn.org 上的 jspwiki 页面目录.

例如本站的 jspwiki 页面的所有内容可以通过下载内容页面压缩包 http://beansoft.java-cn.org/download/jspwiki_pages.zip 4MB 解压缩到本机wiki页面目录即可浏览, 便于所有成员共享自己编写的资料.

				

				/*
 * @(#)ZipUtil.java 1.00 2007-2-15
 *
 * Copyright 2007 BeanSoft Studio. All rights reserved.
 * PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package beansoft.jar;
import java.io.*;
import java.util.jar.*;
/**
 * ZipUtil, a Zip util class created by BeanSoft(beansoft@126.com).
 * 
 * Chinese documents:<br/>
 * 一个 ZIP 工具类, BeanSoft(beansoft@126.com) 创建.
 * 
 * @author BeanSoft
 * @version 1.00 2007-2-15
 */
public class ZipUtil {
	/**
	 * The buffer.
	 */
	protected static byte buf[] = new byte[1024];
	
	
	/**
	 * 遍历目录并添加文件.
	 * @param jos - JAR 输出流
	 * @param file - 目录文件名
	 * @param pathName - ZIP中的目录名
	 * @throws IOException
	 * @throws FileNotFoundException
	 */
	private static void recurseFiles(JarOutputStream jos, File file, String pathName)
		throws IOException, FileNotFoundException
	{
		if (file.isDirectory())
		{
			pathName = pathName + file.getName() + "/";
			jos.putNextEntry(new JarEntry(pathName));
			String fileNames[] = file.list();
			if (fileNames != null)
			{
				for (int i = 0; i < fileNames.length; i++)
					recurseFiles(jos, new File(file, fileNames[i]), pathName);
	
			}
		} else
		{
			JarEntry jarEntry = new JarEntry(pathName + file.getName());
//			System.out.println(pathName + "  " + file.getName());
			FileInputStream fin = new FileInputStream(file);
			BufferedInputStream in = new BufferedInputStream(fin);
			jos.putNextEntry(jarEntry);
			
			int len;
			while ((len = in.read(buf)) >= 0) 
				jos.write(buf, 0, len);
			in.close();
			jos.closeEntry();
		}
	}
	
	/**
	 * 创建 ZIP/JAR 文件.
	 * @param directory - 要添加的目录
	 * @param zipFile - 保存的 ZIP 文件名
	 * @param zipFolderName - ZIP 中的路径名
	 * @param level - 压缩级别(0~9)
	 * @throws IOException
	 * @throws FileNotFoundException
	 */
	public static void makeDirectoryToZip(File directory, File zipFile, String zipFolderName, int level)
		throws IOException, FileNotFoundException
	{
		level = checkZipLevel(level);
		
		if(zipFolderName == null) {
			zipFolderName = "";
		}
		
		JarOutputStream jos = new JarOutputStream(new FileOutputStream(zipFile), new Manifest());
		jos.setLevel(level);
		
		String fileNames[] = directory.list();
		if (fileNames != null)
		{
			for (int i = 0; i < fileNames.length; i++)
				recurseFiles(jos, new File(directory, fileNames[i]), zipFolderName);
	
		}
		jos.close();
	}
	
	/**
	 * 检查并设置有效的压缩级别.
	 * @param level - 压缩级别
	 * @return 有效的压缩级别或者默认压缩级别
	 */
	public static int checkZipLevel(int level)
	{
		if(level < 0 || level > 9) level = 7;
		return level;
	}
}
		

用法示例(JSP页面, 将站点的 /jspwiki 目录下的所有文件打包为 download/jspwiki_pages.zip):

				

				<%
String homeDir = application.getRealPath(".");
java.io.File zipFile = new java.io.File(homeDir, "download" + java.io.File.separatorChar
	+ "jspwiki_pages.zip");
java.io.File pagesDirectory = new java.io.File(homeDir, "jspwiki");
out.println("Making zip file from folder /jspwiki to " + zipFile);
out.println("<br/>");
beansoft.jar.ZipUtil.makeDirectoryToZip(pagesDirectory, zipFile, null, 9);
out.println("Zip file " + zipFile + " has been made.");
%>
<br/>
<a href="./download/jspwiki_pages.zip">Download ZIP File</a>