将zip文件提取到目录中，如果目标文件不存在，则会创建该文件。

/** from 
nowjava - 时代Java**/

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.util.ArrayList;

import java.util.List;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

import java.util.zip.ZipOutputStream;


public class Main{//来 自 时代Java - N o w  J a v a . c o m

    /**

     * Size of the buffer to read/write data

     */

    private static final int BUFFER_SIZE = 4096;

    /**

     * Extracts zip file into a directory, if destination file is not exist, it will create it then.

     * 

     * @param zipFile file to be unzip

     * @param destDirectory folders to save unziped files

     * @throws IOException

     */

    public static boolean unzip(File zipFile, String destDirectory) {

        ZipInputStream zipIn = null;

        try {

            zipIn = new ZipInputStream(new FileInputStream(zipFile));

            ZipEntry entry = zipIn.getNextEntry();

            // iterates over entries in the zip file

            while (entry != null) {

                String filePath = destDirectory + File.separator

                        + entry.getName();

                if (!entry.isDirectory()) {

                    // if the entry is a file, extracts it

                    extractFile(zipIn, filePath);

                } else {

                    // if the entry is a directory, make the directory

                    File dir = new File(filePath);

                    dir.mkdir();

                }

                zipIn.closeEntry();

                entry = zipIn.getNextEntry();

            }

            return true;

        } catch (IOException e) {

            e.printStackTrace();

            return false;

        } finally {

            if (zipIn != null) {

                try {

                    zipIn.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

    }

    /**

     * Unzip file retrived from input stream into directory.

     * 

     * @param inputStream

     *            input stream of zip file

     * @param destDirectory

     *            directory to save unziped files

     * @throws IOException

     */

    public static boolean unzip(InputStream inputStream,

            String destDirectory) {

        File destDir = new File(destDirectory);

        if (!destDir.exists()) {

            destDir.mkdir();

        }

        ZipInputStream zipIn = null;

        try {

            zipIn = new ZipInputStream(inputStream);

            ZipEntry entry = zipIn.getNextEntry();


            // iterates over entries in the zip file

            while (entry != null) {

                String filePath = destDirectory + File.separator

                        + entry.getName();

                if (!entry.isDirectory()) {

                    // if the entry is a file, extracts it

                    extractFile(zipIn, filePath);

                } else {

                    // if the entry is a directory, make the directory

                    File dir = new File(filePath);

                    dir.mkdir();

                }

                zipIn.closeEntry();

                entry = zipIn.getNextEntry();

            }

            return true;

        } catch (IOException e) {

            e.printStackTrace();

            return false;

        } finally {

            try {

                zipIn.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }