Android 压缩解压zip文件

上次写了个解压缩功能,但有局限性,比如压缩文件xx.zip 里包括子目录的情况下,执行上次解压缩的功能就不能实现我们想要的效果,于是在网上参考了一下java的解压缩功能。对上次解压缩zip功能进行了修改。

现在也可以解压 那些包含子目录的zip文件。

我们经常会使用WinZIP等压缩软件将文件进行压缩以方便传输。在java里面也提供了将文件进行压缩以减少传输时的数据量的类,可以很方便的将文件压缩成ZIP、JAR、GZIP等形式,GZIP主要是在Linux系统下的压缩文件。

下面主要讲的就是ZIP形式的压缩文件,而JAR、GZIP形式的压缩文件也是类似的用法。

ZIP是一种很常见的压缩形式,在java中要实现ZIP的压缩主要用到的是java.util.zip这个包里面的类。主要有ZipFile、ZipOutputStream、ZipInputStream和ZipEntry。ZipOutputStream是用来压缩文件的,ZipInputStream和ZipFile是用来解压缩文件的,在压缩和解压缩的过程中,ZipEntry都会用到。在java的Zip压缩文件中,每一个子文件都是一个ZipEntry对象。

 

/**
     * 解压缩功能.
     * 将zipFile文件解压到folderPath目录下.
     * @throws Exception
 */
     public int upZipFile(File zipFile, String folderPath)throws ZipException,IOException {
     //public static void upZipFile() throws Exception{
         ZipFile zfile=new ZipFile(zipFile);
         Enumeration zList=zfile.entries();
         ZipEntry ze=null;
         byte[] buf=new byte[1024];
         while(zList.hasMoreElements()){
             ze=(ZipEntry)zList.nextElement();    
             if(ze.isDirectory()){
                 Log.d("upZipFile", "ze.getName() = "+ze.getName());
                 String dirstr = folderPath + ze.getName();
                 //dirstr.trim();
                 dirstr = new String(dirstr.getBytes("8859_1"), "GB2312");
                 Log.d("upZipFile", "str = "+dirstr);
                 File f=new File(dirstr);
                 f.mkdir();
                 continue;
             }
             Log.d("upZipFile", "ze.getName() = "+ze.getName());
             OutputStream os=new BufferedOutputStream(new FileOutputStream(getRealFileName(folderPath, ze.getName())));
             InputStream is=new BufferedInputStream(zfile.getInputStream(ze));
             int readLen=0;
             while ((readLen=is.read(buf, 0, 1024))!=-1) {
                 os.write(buf, 0, readLen);
             }
             is.close();
             os.close();    
         }
         zfile.close();
         Log.d("upZipFile", "finishssssssssssssssssssss");
         return 0;
     }
 
     /**
     * 给定根目录,返回一个相对路径所对应的实际文件名.
     * @param baseDir 指定根目录
     * @param absFileName 相对路径名,来自于ZipEntry中的name
     * @return java.io.File 实际的文件
 */
     public static File getRealFileName(String baseDir, String absFileName){
         String[] dirs=absFileName.split("/");
         File ret=new File(baseDir);
         String substr = null;
         if(dirs.length>1){
             for (int i = 0; i < dirs.length-1;i++) {
                 substr = dirs[i];
                 try {
                     //substr.trim();
                     substr = new String(substr.getBytes("8859_1"), "GB2312");
                     
                 } catch (UnsupportedEncodingException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
                 ret=new File(ret, substr);
                 
             }
             Log.d("upZipFile", "1ret = "+ret);
             if(!ret.exists())
                 ret.mkdirs();
             substr = dirs[dirs.length-1];
             try {
                 //substr.trim();
                 substr = new String(substr.getBytes("8859_1"), "GB2312");
                 Log.d("upZipFile", "substr = "+substr);
             } catch (UnsupportedEncodingException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
             
             ret=new File(ret, substr);
             Log.d("upZipFile", "2ret = "+ret);
             return ret;
         }
         return ret;
     }
package com.once;

import java.io.File;
import java.util.ArrayList;
import java.util.LinkedList;
/**
 *  文件夹遍历
 * @author once
 *
 */
public class DirTraversal {
    
    //no recursion
    public static LinkedList<File> listLinkedFiles(String strPath) {
        LinkedList<File> list = new LinkedList<File>();
        File dir = new File(strPath);
        File file[] = dir.listFiles();
        for (int i = 0; i < file.length; i++) {
            if (file[i].isDirectory())
                list.add(file[i]);
            else
                System.out.println(file[i].getAbsolutePath());
        }
        File tmp;
        while (!list.isEmpty()) {
            tmp = (File) list.removeFirst();
            if (tmp.isDirectory()) {
                file = tmp.listFiles();
                if (file == null)
                    continue;
                for (int i = 0; i < file.length; i++) {
                    if (file[i].isDirectory())
                        list.add(file[i]);
                    else
                        System.out.println(file[i].getAbsolutePath());
                }
            } else {
                System.out.println(tmp.getAbsolutePath());
            }
        }
        return list;
    }

    
    //recursion
    public static ArrayList<File> listFiles(String strPath) {
        return refreshFileList(strPath);
    }

    public static ArrayList<File> refreshFileList(String strPath) {
        ArrayList<File> filelist = new ArrayList<File>();
        File dir = new File(strPath);
        File[] files = dir.listFiles();

        if (files == null)
            return null;
        for (int i = 0; i < files.length; i++) {
            if (files[i].isDirectory()) {
                refreshFileList(files[i].getAbsolutePath());
            } else {
                if(files[i].getName().toLowerCase().endsWith("zip"))
                    filelist.add(files[i]);
            }
        }
        return filelist;
    }
}
package com.once;

import java.io.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

/**
 * Java utils 实现的Zip工具
 *
 * @author once
 */
public class ZipUtils {
    private static final int BUFF_SIZE = 1024 * 1024; // 1M Byte

    /**
     * 批量压缩文件(夹)
     *
     * @param resFileList 要压缩的文件(夹)列表
     * @param zipFile 生成的压缩文件
     * @throws IOException 当压缩过程出错时抛出
     */
    public static void zipFiles(Collection<File> resFileList, File zipFile) throws IOException {
        ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(
                zipFile), BUFF_SIZE));
        for (File resFile : resFileList) {
            zipFile(resFile, zipout, "");
        }
        zipout.close();
    }

    /**
     * 批量压缩文件(夹)
     *
     * @param resFileList 要压缩的文件(夹)列表
     * @param zipFile 生成的压缩文件
     * @param comment 压缩文件的注释
     * @throws IOException 当压缩过程出错时抛出
     */
    public static void zipFiles(Collection<File> resFileList, File zipFile, String comment)
            throws IOException {
        ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(
                zipFile), BUFF_SIZE));
        for (File resFile : resFileList) {
            zipFile(resFile, zipout, "");
        }
        zipout.setComment(comment);
        zipout.close();
    }

    /**
     * 解压缩一个文件
     *
     * @param zipFile 压缩文件
     * @param folderPath 解压缩的目标目录
     * @throws IOException 当解压缩过程出错时抛出
     */
    public static void upZipFile(File zipFile, String folderPath) throws ZipException, IOException {
        File desDir = new File(folderPath);
        if (!desDir.exists()) {
            desDir.mkdirs();
        }
        ZipFile zf = new ZipFile(zipFile);
        for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
            ZipEntry entry = ((ZipEntry)entries.nextElement());
            InputStream in = zf.getInputStream(entry);
            String str = folderPath + File.separator + entry.getName();
            str = new String(str.getBytes("8859_1"), "GB2312");
            File desFile = new File(str);
            if (!desFile.exists()) {
                File fileParentDir = desFile.getParentFile();
                if (!fileParentDir.exists()) {
                    fileParentDir.mkdirs();
                }
                desFile.createNewFile();
            }
            OutputStream out = new FileOutputStream(desFile);
            byte buffer[] = new byte[BUFF_SIZE];
            int realLength;
            while ((realLength = in.read(buffer)) > 0) {
                out.write(buffer, 0, realLength);
            }
            in.close();
            out.close();
        }
    }

    /**
     * 解压文件名包含传入文字的文件
     *
     * @param zipFile 压缩文件
     * @param folderPath 目标文件夹
     * @param nameContains 传入的文件匹配名
     * @throws ZipException 压缩格式有误时抛出
     * @throws IOException IO错误时抛出
     */
    public static ArrayList<File> upZipSelectedFile(File zipFile, String folderPath,
            String nameContains) throws ZipException, IOException {
        ArrayList<File> fileList = new ArrayList<File>();

        File desDir = new File(folderPath);
        if (!desDir.exists()) {
            desDir.mkdir();
        }

        ZipFile zf = new ZipFile(zipFile);
        for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
            ZipEntry entry = ((ZipEntry)entries.nextElement());
            if (entry.getName().contains(nameContains)) {
                InputStream in = zf.getInputStream(entry);
                String str = folderPath + File.separator + entry.getName();
                str = new String(str.getBytes("8859_1"), "GB2312");
                // str.getBytes("GB2312"),"8859_1" 输出
                // str.getBytes("8859_1"),"GB2312" 输入
                File desFile = new File(str);
                if (!desFile.exists()) {
                    File fileParentDir = desFile.getParentFile();
                    if (!fileParentDir.exists()) {
                        fileParentDir.mkdirs();
                    }
                    desFile.createNewFile();
                }
                OutputStream out = new FileOutputStream(desFile);
                byte buffer[] = new byte[BUFF_SIZE];
                int realLength;
                while ((realLength = in.read(buffer)) > 0) {
                    out.write(buffer, 0, realLength);
                }
                in.close();
                out.close();
                fileList.add(desFile);
            }
        }
        return fileList;
    }

    /**
     * 获得压缩文件内文件列表
     *
     * @param zipFile 压缩文件
     * @return 压缩文件内文件名称
     * @throws ZipException 压缩文件格式有误时抛出
     * @throws IOException 当解压缩过程出错时抛出
     */
    public static ArrayList<String> getEntriesNames(File zipFile) throws ZipException, IOException {
        ArrayList<String> entryNames = new ArrayList<String>();
        Enumeration<?> entries = getEntriesEnumeration(zipFile);
        while (entries.hasMoreElements()) {
            ZipEntry entry = ((ZipEntry)entries.nextElement());
            entryNames.add(new String(getEntryName(entry).getBytes("GB2312"), "8859_1"));
        }
        return entryNames;
    }

    /**
     * 获得压缩文件内压缩文件对象以取得其属性
     *
     * @param zipFile 压缩文件
     * @return 返回一个压缩文件列表
     * @throws ZipException 压缩文件格式有误时抛出
     * @throws IOException IO操作有误时抛出
     */
    public static Enumeration<?> getEntriesEnumeration(File zipFile) throws ZipException,
            IOException {
        ZipFile zf = new ZipFile(zipFile);
        return zf.entries();

    }

    /**
     * 取得压缩文件对象的注释
     *
     * @param entry 压缩文件对象
     * @return 压缩文件对象的注释
     * @throws UnsupportedEncodingException
     */
    public static String getEntryComment(ZipEntry entry) throws UnsupportedEncodingException {
        return new String(entry.getComment().getBytes("GB2312"), "8859_1");
    }

    /**
     * 取得压缩文件对象的名称
     *
     * @param entry 压缩文件对象
     * @return 压缩文件对象的名称
     * @throws UnsupportedEncodingException
     */
    public static String getEntryName(ZipEntry entry) throws UnsupportedEncodingException {
        return new String(entry.getName().getBytes("GB2312"), "8859_1");
    }

    /**
     * 压缩文件
     *
     * @param resFile 需要压缩的文件(夹)
     * @param zipout 压缩的目的文件
     * @param rootpath 压缩的文件路径
     * @throws FileNotFoundException 找不到文件时抛出
     * @throws IOException 当压缩过程出错时抛出
     */
    private static void zipFile(File resFile, ZipOutputStream zipout, String rootpath)
            throws FileNotFoundException, IOException {
        rootpath = rootpath + (rootpath.trim().length() == 0 ? "" : File.separator)
                + resFile.getName();
        rootpath = new String(rootpath.getBytes("8859_1"), "GB2312");
        if (resFile.isDirectory()) {
            File[] fileList = resFile.listFiles();
            for (File file : fileList) {
                zipFile(file, zipout, rootpath);
            }
        } else {
            byte buffer[] = new byte[BUFF_SIZE];
            BufferedInputStream in = new BufferedInputStream(new FileInputStream(resFile),
                    BUFF_SIZE);
            zipout.putNextEntry(new ZipEntry(rootpath));
            int realLength;
            while ((realLength = in.read(buffer)) != -1) {
                zipout.write(buffer, 0, realLength);
            }
            in.close();
            zipout.flush();
            zipout.closeEntry();
        }
    }
}

 记得要在AndroidManifest.xml里添加权限:

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

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转载自biandroid.iteye.com/blog/1638085