java zip,unzip

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package com.eric.io;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import org.apache.tools.zip.ZipEntry;import org.apache.tools.zip.ZipFile;import org.apache.tools.zip.ZipOutputStream;public class Decompression {    private static final int BUFFEREDSIZE = 1024;    public Decompression() {    }    /**     * 解压zip格式的压缩文件到当前文件夹     *      * @param zipFileName     * @throws Exception     */    @SuppressWarnings("unchecked")    public synchronized void unzipFile(String zipFileName) throws Exception {        try {            File f = new File(zipFileName);            ZipFile zipFile = new ZipFile(zipFileName);            if ((!f.exists()) && (f.length() <= 0)) {                throw new Exception("要解压的文件不存在!");            }            System.out.println(zipFileName + " was uncompressing....");            String strPath, gbkPath, strtemp;            File tempFile = new File(f.getParent());            strPath = tempFile.getAbsolutePath();            java.util.Enumeration e = zipFile.getEntries();            while (e.hasMoreElements()) {                org.apache.tools.zip.ZipEntry zipEnt = (ZipEntry) e                        .nextElement();                gbkPath = zipEnt.getName();                System.out.println("uncomress:" + zipEnt.getName());                if (zipEnt.isDirectory()) {                    strtemp = strPath + "/" + gbkPath;                    File dir = new File(strtemp);                    dir.mkdirs();                    continue;                } else {                    // 读写文件                    InputStream is = zipFile.getInputStream(zipEnt);                    BufferedInputStream bis = new BufferedInputStream(is);                    gbkPath = zipEnt.getName();                    strtemp = strPath + "/" + gbkPath;                    // 建目录                    String strsubdir = gbkPath;                    for (int i = 0; i < strsubdir.length(); i++) {                        if (strsubdir.substring(i, i + 1).equalsIgnoreCase("/")) {                            String temp = strPath + "/"                                    + strsubdir.substring(0, i);                            File subdir = new File(temp);                            if (!subdir.exists())                                subdir.mkdir();                        }                    }                    FileOutputStream fos = new FileOutputStream(strtemp);                    BufferedOutputStream bos = new BufferedOutputStream(fos);                    int c;                    while ((c = bis.read()) != -1) {                        bos.write((byte) c);                    }                    bos.close();                    fos.close();                }            }        } catch (Exception e) {            e.printStackTrace();            throw e;        }    }    /**     * 解压zip格式的压缩文件到指定位置     *      * @param zipFileName     *            压缩文件     * @param extPlace     *            解压目录     * @throws Exception     */    @SuppressWarnings("unchecked")    public synchronized void unzip(String zipFileName, String extPlace)            throws Exception {        try {            (new File(extPlace)).mkdirs();            File f = new File(zipFileName);            ZipFile zipFile = new ZipFile(zipFileName);            if ((!f.exists()) && (f.length() <= 0)) {                throw new Exception("要解压的文件不存在!");            }            String strPath, gbkPath, strtemp;            File tempFile = new File(extPlace);            strPath = tempFile.getAbsolutePath();            java.util.Enumeration e = zipFile.getEntries();            while (e.hasMoreElements()) {                org.apache.tools.zip.ZipEntry zipEnt = (ZipEntry) e                        .nextElement();                gbkPath = zipEnt.getName();                if (zipEnt.isDirectory()) {                    strtemp = strPath + File.separator + gbkPath;                    File dir = new File(strtemp);                    dir.mkdirs();                    continue;                } else {                    // 读写文件                    InputStream is = zipFile.getInputStream(zipEnt);                    BufferedInputStream bis = new BufferedInputStream(is);                    gbkPath = zipEnt.getName();                    strtemp = strPath + File.separator + gbkPath;                    // 建目录                    String strsubdir = gbkPath;                    for (int i = 0; i < strsubdir.length(); i++) {                        if (strsubdir.substring(i, i + 1).equalsIgnoreCase("/")) {                            String temp = strPath + File.separator                                    + strsubdir.substring(0, i);                            File subdir = new File(temp);                            if (!subdir.exists())                                subdir.mkdir();                        }                    }                    FileOutputStream fos = new FileOutputStream(strtemp);                    BufferedOutputStream bos = new BufferedOutputStream(fos);                    int c;                    while ((c = bis.read()) != -1) {                        bos.write((byte) c);                    }                    bos.close();                    fos.close();                }            }        } catch (Exception e) {            e.printStackTrace();            throw e;        }    }    /**     * 压缩zip格式的压缩文件     *      * @param inputFilename     *            压缩的文件或文件夹及详细路径     * @param zipFilename     *            输出文件名称及详细路径     * @throws IOException     */    public synchronized void zip(String inputFilename, String zipFilename)            throws IOException {        zip(new File(inputFilename), zipFilename);    }    /**     * 压缩zip格式的压缩文件     *      * @param inputFile     *            需压缩文件     * @param zipFilename     *            输出文件及详细路径     * @throws IOException     */    public synchronized void zip(File inputFile, String zipFilename)            throws IOException {        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(                zipFilename));        try {            zip(inputFile, out, "");            System.out.println(zipFilename + " was genrated successful....");        } catch (IOException e) {            throw e;        } finally {            out.close();        }    }    /**     * 压缩zip格式的压缩文件     *      * @param inputFile     *            需压缩文件     * @param out     *            输出压缩文件     * @param base     *            结束标识     * @throws IOException     */    @SuppressWarnings("unused")    private synchronized void zip(File inputFile, ZipOutputStream out,            String base) throws IOException {        System.out.println("compress " + inputFile + " ...");        if (inputFile.isDirectory()) {            File[] inputFiles = inputFile.listFiles();            out.putNextEntry(new ZipEntry(base + "/"));            base = base.length() == 0 ? "" : base + "/";            for (int i = 0; i < inputFiles.length; i++) {                System.out.println("compress file:" + inputFiles[i].getName());                zip(inputFiles[i], out, base + inputFiles[i].getName());            }        } else {            if (base.length() > 0) {                out.putNextEntry(new ZipEntry(base));            } else {                out.putNextEntry(new ZipEntry(inputFile.getName()));            }            FileInputStream in = new FileInputStream(inputFile);            try {                int c;                byte[] by = new byte[BUFFEREDSIZE];                while ((c = in.read(by)) != -1) {                    out.write(by, 0, c);                }            } catch (IOException e) {                throw e;            } finally {                in.close();            }        }    }    // public static void main(String[] args) {    // Decompression decompression = new Decompression();    // try {    // decompression.unzipFile("c:/test.zip");    // decompression.unzip("c:/test.zip", "c:/test22");    // decompression.zip("c:/test22", "c:/test222.zip");    // } catch (Exception e) {    // // TODO Auto-generated catch block    // e.printStackTrace();    // }    // }}
转自：http://blog.csdn.net/eric_sunah/article/details/7082056
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