ZipToFile.java

package com.jerome.utils.file;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ZipToFile {

	public static final String ZIP_FILENAME = "D:\\res.zip";// 需要解压缩的文件名
	public static final String ZIP_DIR = "D:\\";// 需要压缩的文件夹
	public static final String UN_ZIP_DIR = "D:\\";// 要解压的文件目录
	public static final int BUFFER = 1024;// 缓存大小

	public static void main(String[] args) {
		try {
			upZipFile(ZIP_FILENAME, UN_ZIP_DIR);
		} catch (Exception e) {
			e.printStackTrace();

		}
	}

	/**
	 * zip压缩功能. 压缩baseDir(文件夹目录)下所有文件，包括子目录
	 * 
	 * @throws Exception
	 */
	public static void zipFile(String baseDir, String fileName)
			throws Exception {
		List<File> fileList = getSubFiles(new File(baseDir));
		ZipOutputStream zos = new ZipOutputStream(
				new FileOutputStream(fileName));
		ZipEntry ze = null;
		byte[] buf = new byte[BUFFER];
		int readLen = 0;
		for (int i = 0; i < fileList.size(); i++) {
			File f = (File) fileList.get(i);
			ze = new ZipEntry(getAbsFileName(baseDir, f));
			ze.setSize(f.length());
			ze.setTime(f.lastModified());
			zos.putNextEntry(ze);
			InputStream is = new BufferedInputStream(new FileInputStream(f));
			while ((readLen = is.read(buf, 0, BUFFER)) != -1) {
				zos.write(buf, 0, readLen);
			}
			is.close();
		}
		zos.close();
	}

	/**
	 * 给定根目录，返回另一个文件名的相对路径，用于zip文件中的路径.
	 * 
	 * @param baseDir
	 *            java.lang.String 根目录
	 * @param realFileName
	 *            java.io.File 实际的文件名
	 * @return 相对文件名
	 */
	private static String getAbsFileName(String baseDir, File realFileName) {
		File real = realFileName;
		File base = new File(baseDir);
		String ret = real.getName();
		while (true) {
			real = real.getParentFile();
			if (real == null)
				break;
			if (real.equals(base))
				break;
			else
				ret = real.getName() + "/" + ret;
		}
		return ret;
	}

	/**
	 * 取得指定目录下的所有文件列表，包括子目录.
	 * 
	 * @param baseDir
	 *            File 指定的目录
	 * @return 包含java.io.File的List
	 */
	private static List<File> getSubFiles(File baseDir) {
		List<File> ret = new ArrayList<File>();
		File[] tmp = baseDir.listFiles();
		for (int i = 0; i < tmp.length; i++) {
			if (tmp[i].isFile())
				ret.add(tmp[i]);
			if (tmp[i].isDirectory())
				ret.addAll(getSubFiles(tmp[i]));
		}
		return ret;
	}

	/**
	 * 解压缩功能. 将ZIP_FILENAME文件解压到ZIP_DIR目录下.
	 * 
	 * @throws Exception
	 */
	public static void upZipFile(String zipFilePath, String destPath)
			throws Exception {
		ZipFile zfile = new ZipFile(zipFilePath);
		Enumeration<? extends ZipEntry> zList = zfile.entries();
		ZipEntry ze = null;
		byte[] buf = new byte[1024];
		while (zList.hasMoreElements()) {
			ze = (ZipEntry) zList.nextElement();
			if (ze.isDirectory()) {
				File f = new File(destPath + ze.getName());
				f.mkdir();
				continue;
			}
			OutputStream os = new BufferedOutputStream(new FileOutputStream(
					getRealFileName(destPath, ze.getName())));
			InputStream is = new BufferedInputStream(zfile.getInputStream(ze));
			int readLen = 0;
			while ((readLen = is.read(buf, 0, 1024)) != -1) {
				os.write(buf, 0, readLen);
			}
			is.close();
			os.close();
		}
		zfile.close();
	}

	/**
	 * 给定根目录，返回一个相对路径所对应的实际文件名.
	 * 
	 * @param baseDir
	 *            指定根目录
	 * @param absFileName
	 *            相对路径名，来自于ZipEntry中的name
	 * @return java.io.File 实际的文件
	 */
	public static File getRealFileName(String baseDir, String absFileName) {
		String[] dirs = absFileName.split("/");
		File ret = new File(baseDir);
		if (dirs.length > 1) {
			for (int i = 0; i < dirs.length - 1; i++) {
				ret = new File(ret, dirs[i]);
			}
			if (!ret.exists())
				ret.mkdirs();
			ret = new File(ret, dirs[dirs.length - 1]);
			return ret;
		}
		return ret;
	}

}