JAVA 解壓ZIP

/*
提供zip檔案的解壓縮介面：
AdapterZipFile：
   輸入：zipFileName（zip檔案的絕對路徑），outputDirectory（zip檔案解壓縮後的存放路徑）
   輸出：
   說明：初始化函數
unZipFile：
   輸入：無
   輸出：
   說明：解壓縮zip檔案，解壓縮後存放到outputDirectory路徑下
GetZipFileList：
   輸入：無
   輸出：list
   說明：解壓縮後的檔案清單絕對路徑存放在ArrayList動態數組中
*/

package com.mop.pushmail.adapter.htmlziprar;

import java.io.*;
import java.util.*;
import org.apache.tools.zip.*;

public class AdapterZipFile {
    String zipFileName = null;//zip檔案的絕對路徑
    String outputDirectory = null;//zip檔案解壓縮後的存放路徑
    ArrayList list = new ArrayList();//檔案解壓縮後的檔案清單絕對路徑

//    public AdapterZipFile(String zipFileName) {
//        if(zipFileName == null){
//            return;
//        }
//        this.zipFileName = zipFileName.replace("/","//");
//        unZipFile();
//    }

    //初始化
    public AdapterZipFile(String zipFileName, String outputDirectory){
        if(zipFileName == null){
            return;
        }
        this.zipFileName = zipFileName;
        if(outputDirectory != null){
             this.outputDirectory = outputDirectory;
        }else{
            this.outputDirectory = zipFileName.substring(0,
                    zipFileName.replace('//', '/').lastIndexOf("/"));
        }
       // unZipFile();
    }

   //建立目錄
    private void createDirectory(String directory, String subDirectory) {
        String dir[];
        File fl = new File(directory);
        try {
            if (subDirectory == "" && fl.exists() != true)
                fl.mkdirs();
            else if (subDirectory != "") {
                dir = subDirectory.replace("//","/").split("/");
                for (int i = 0; i < dir.length; i++) {
                    File subFile = new File(directory + File.separator + dir[i]);
                    if (!subFile.exists())
                        subFile.mkdir();
                    directory += File.separator + dir[i];
                }
            }
        }catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

    //解壓縮檔案
    //如果outputDierctory為null，解壓到zipFileName檔案的目前的目錄下
    public void unZipFile() {
        File file = new File(zipFileName);
        if (!file.exists()) {
            return;
        }
        createDirectory(outputDirectory, "");

        try {
            ZipFile zipFile = new ZipFile(zipFileName);
            Enumeration e = zipFile.getEntries();
            ZipEntry zipEntry = null;
            while (e.hasMoreElements()) {
                zipEntry = (ZipEntry) e.nextElement();
                if (zipEntry.isDirectory()) {
                    String name = zipEntry.getName();
                    name = name.substring(0, name.length() - 1);
                    File f = new File(outputDirectory + File.separator + name);
                    f.mkdir();
                } else {
                    String fileName = zipEntry.getName();
                    fileName = fileName.replace('//', '/');
                    //檔案在多層目錄下 這時需要建立目錄如：d1/d2/1.txt
                    if (fileName.indexOf("/") != -1) {
                        createDirectory(outputDirectory, fileName.substring(0,
                                fileName.lastIndexOf("/")));
                        fileName = fileName.substring(
                                fileName.lastIndexOf("/") + 1, fileName
                                .length());
                    }

                    list.add(outputDirectory + File.separator
                                      + zipEntry.getName());
                    File f = new File(outputDirectory + File.separator
                                      + zipEntry.getName());

                    f.createNewFile();
                    InputStream in = zipFile.getInputStream(zipEntry);
                    FileOutputStream out = new FileOutputStream(f);

                    byte[] by = new byte[1024];
                    int c;
                    while ((c = in.read(by)) != -1) {
                        out.write(by, 0, c);
                    }
                    out.close();
                    in.close();
                }
            }
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

   //返回zip檔案解壓撒後檔案清單的絕對路徑
    public ArrayList GetZipFileList(){
        return list;
    }
}