java 解壓縮zip,tar.bz2,tar.gz

package com.canalyze.web.tool;

import java.io.*;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;


public class Decompression {

    /**
     * @param args
     */
    static final int BUFFER = 2048;
   /*** 
   * 解壓.zip檔案
   * @param filename
    @SuppressWarnings("unchecked")
    public  static void unzip(String filename) {
        try{
//            String filename = "D:/1.zip";
            int index1=filename.lastIndexOf(".");
            String zipName=filename.substring(0,index1);
            ZipFile zipFile = new ZipFile(filename);
            Enumeration enu = zipFile.entries();
            new File(zipName).mkdirs();
            while(enu.hasMoreElements()){
                ZipEntry zipEntry = (ZipEntry)enu.nextElement();
                if(zipEntry.isDirectory()){
                    new File(zipName+"/"+zipEntry.getName()).mkdirs();
                    continue;
                }
                BufferedInputStream bis = new BufferedInputStream(zipFile.getInputStream(zipEntry));
                File file = new File(zipName+"/"+zipEntry.getName());
                File parent = file.getParentFile();
                if(parent != null && !parent.exists()){
                    parent.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(file);
                BufferedOutputStream bos = new BufferedOutputStream(fos,BUFFER);
                byte[] array = new byte[BUFFER];
                while((bis.read(array, 0, BUFFER))!=-1){
                    bos.write(array, 0, BUFFER);
                }
                bos.flush();
                bos.close();
                bis.close();
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    /***
     * 解壓.tar.bz2檔案到指定檔案夾
     * @param file
     * @param outputDir
     * @throws IOException
     */
    public static void decompressTarBz2(File file, String outputDir) throws IOException {
        try (TarArchiveInputStream tarIn =
                     new TarArchiveInputStream(
                             new BZip2CompressorInputStream(
                                     new FileInputStream(file)))) {
            createDirectory(outputDir, null);
            TarArchiveEntry entry;
            while ((entry = tarIn.getNextTarEntry()) != null) {
                if (entry.isDirectory()) {
                    createDirectory(outputDir, entry.getName());
                } else {
                    try (OutputStream out = new FileOutputStream(
                            new File(outputDir + File.separator + entry.getName()))) {
                        writeFile(tarIn, out);
                    }
                }
            }
        }
    }
    /**
     * 寫檔案
     * @param in
     * @param out
     * @throws IOException
     */
    public static void writeFile(InputStream in, OutputStream out) throws IOException {
        int length;
        byte[] b = new byte[1024*100];
        while ((length = in.read(b)) != -1) {
            out.write(b, 0, length);
        }
    }
    /**
     * 建立目錄
     * @param outputDir
     * @param subDir
     */
    public static void createDirectory(String outputDir, String subDir) {
        File file = new File(outputDir);
        //子目錄不為空
        if (!(subDir == null || subDir.trim().equals(""))) {
            file = new File(outputDir + File.separator + subDir);
        }
        if (!file.exists()) {
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }
            file.mkdirs();
        }
    }
    /***
     * 解壓.tar.gz檔案到指定檔案夾
     * @param file
     * @param outputDir
     * @throws IOException
     */
    public static void decompressTarGZip(File file, String outputDir) throws IOException {
        try (TarArchiveInputStream tarIn =
                     new TarArchiveInputStream(
                             new GzipCompressorInputStream(
                                     new FileInputStream(file)))) {
            createDirectory(outputDir, null);
            TarArchiveEntry entry;
            while ((entry = tarIn.getNextTarEntry()) != null) {
                if (entry.isDirectory()) {
                    createDirectory(outputDir, entry.getName());
                } else {
                    try (OutputStream out = new FileOutputStream(
                            new File(outputDir + File.separator + entry.getName()))) {
                        writeFile(tarIn, out);
                    }
                }
            }
        }
    }

}