文件压缩工具

package test;



import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Enumeration;

import java.util.zip.ZipEntry;

import java.util.zip.ZipFile;

import java.util.zip.ZipOutputStream;



import org.apache.log4j.Logger;





/**

 * 功能描述:ZIP压缩与解压工具类

  */

public class ZipUtil {

	private static final Logger log = Logger.getLogger(ZipUtil.class);



	/**

	 * 方法用途和描述: 解压ZIP文件

	 * 

	 * @param zipFilePath

	 *            要解压的ZIP文件路径

	 * @param unZipDir

	 *            要解压到目标文件夹路径

	  */

	@SuppressWarnings("unchecked")

	public static boolean unZip(String zipFilePath, String unZipDir) {



		ZipFile zfile = null;

		OutputStream os = null;

		InputStream is = null;



		try {

			zfile = new ZipFile(zipFilePath);

			log.debug(zfile.getName());

			Enumeration zList = zfile.entries();

			ZipEntry ze = null;

			byte[] buf = new byte[1024];

			String path = null;

			while (zList.hasMoreElements()) {

				// 从ZipFile中得到一个ZipEntry

				ze = (ZipEntry) zList.nextElement();

				if (ze.isDirectory()) {

					log.debug("Dir: " + ze.getName() + " skipped..");

					continue;

				}

				log.debug("Extracting: " + ze.getName() + "\t" + ze.getSize()

						+ "\t" + ze.getCompressedSize());

				// 以ZipEntry为参数得到一个InputStream，并写到OutputStream中

				path = unZipDir.concat("/").concat(ze.getName());

				FileUtil.checkFileDirectoryExists(path);

				os = new BufferedOutputStream(new FileOutputStream(path));

				is = new BufferedInputStream(zfile.getInputStream(ze));

				int readLen = 0;

				while ((readLen = is.read(buf, 0, 1024)) != -1) {

					os.write(buf, 0, readLen);

				}

				os.flush();

				log.debug("Extracted: " + ze.getName());

				ze = null;

			}

			zList = null;

		} catch (FileNotFoundException e) {

			e.printStackTrace();

			return false;

		} catch (IOException e) {

			e.printStackTrace();

			return false;

		} finally {

			if (is != null) {

				try {

					is.close();

				} catch (IOException e) {

					e.printStackTrace();

				}

			}

			if (os != null) {

				try {

					os.close();

				} catch (IOException e) {

					e.printStackTrace();

				}

			}

			if (zfile != null) {

				try {

					zfile.close();

				} catch (IOException e) {

					e.printStackTrace();

				}

			}

		}

		return true;

	}

	

	/**

	 * 

	* 方法用途和描述: 压缩文件

	* @param sourceFilePath 需要压缩的文件路径

	* @param targetFilePath 压缩后放置的文件路径，带.zip

	* @param bufferSize 缓冲长度

	 */

	public static void zip(String sourceFilePath,String targetFilePath,int bufferSize){

		FileOutputStream dest = null;

		ZipOutputStream out = null;

		try {

			BufferedInputStream origin = null;

			dest = new FileOutputStream(targetFilePath);

			out = new ZipOutputStream(new BufferedOutputStream(

					dest));

			byte data[] = new byte[bufferSize];

			File f = new File(sourceFilePath);

			File files[] = f.listFiles();



			for (int i = 0; i < files.length; i++) {

				FileInputStream fi = new FileInputStream(files[i]);

				origin = new BufferedInputStream(fi, bufferSize);

				ZipEntry entry = new ZipEntry(files[i].getName());

				out.putNextEntry(entry);

				int count;

				while ((count = origin.read(data, 0, bufferSize)) != -1) {

					out.write(data, 0, count);

				}

				origin.close();

			}

		} catch (Exception e) {

			e.printStackTrace();

		}finally{

			if (out != null) {

				try {

					out.close();

				} catch (IOException e) {

					e.printStackTrace();

				}

			}

			if (dest != null) {

				try {

					dest.close();

				} catch (IOException e) {

					e.printStackTrace();

				}

			}

		}

	}



	public static void main(String argv[]) {

		zip("E:\\htmltext\\text","E:\\myfiles.zip",2048);

	}



}