android压缩解压zip文件
网上各种方法的收集:
1、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。
/** * 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; }
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"/>
2、我 们在日常生活中会用到解压缩,这个是非常重要的,那么我们在android系统中有没有解压缩那。如果有的话,那我们如何实现Zip文件的解压缩功能呢? 那么我们就看看下面的解析吧,因为Android内部已经集成了zlib库,对于英文和非密码的Zip文件解压缩还是比较简单的,下面给大家一个解压缩 zip的java代码,可以在Android上任何版本中使用,Unzip这个静态方法比较简单,参数一为源zip文件的完整路径,参数二为解压缩后存放 的文件夹。希望这段代码能教会大家解压缩。
private static void Unzip(String zipFile, String targetDir) { int BUFFER = 4096; //这里缓冲区我们使用4KB, String strEntry; //保存每个zip的条目名称 try { BufferedOutputStream dest = null; //缓冲输出流 FileInputStream fis = new FileInputStream(zipFile); ZipInputStream zis = new ZipInputStream(new BufferedInputStream(fis)); ZipEntry entry; //每个zip条目的实例 while ((entry = zis.getNextEntry()) != null) { try { Log.i("Unzip: ","="+ entry); int count; byte data[] = new byte[BUFFER]; strEntry = entry.getName(); File entryFile = new File(targetDir + strEntry); File entryDir = new File(entryFile.getParent()); if (!entryDir.exists()) { entryDir.mkdirs(); } FileOutputStream fos = new FileOutputStream(entryFile); dest = new BufferedOutputStream(fos, BUFFER); while ((count = zis.read(data, 0, BUFFER)) != -1) { dest.write(data, 0, count); } dest.flush(); dest.close(); } catch (Exception ex) { ex.printStackTrace(); } } zis.close(); } catch (Exception cwj) { cwj.printStackTrace(); } } 上面是Android开发网总结的zip文件解压缩代码,希望你大家有用,需要注意的是参数均填写完整的路径,比如/mnt/sdcard/xxx.zip这样的类型。 下面的方法是,解压只有一个文件组成的zip到当前目录,并且给解压出的文件重命名: public static void unzipSingleFileHereWithFileName(String zipPath, String name) throws IOException{ File zipFile = new File(zipPath); File unzipFile = new File(zipFile.getParent() + "/" + name); ZipInputStream zipInStream = null; FileOutputStream unzipOutStream = null; try { zipInStream = new ZipInputStream(new FileInputStream(zipFile)); ZipEntry zipEntry = zipInStream.getNextEntry(); if (!zipEntry.isDirectory()) { unzipOutStream = new FileOutputStream(unzipFile); byte[] buf = new byte[4096]; int len = -1; while((len = zipInStream.read(buf)) != -1){ unzipOutStream.write(buf, 0, len); } } } finally { if(unzipOutStream != null){ unzipOutStream.close(); } if (zipInStream != null) { zipInStream.close(); } } }
3、研究了一下Android上Zip的用法,写了个类把常用的几种方法写了出来
/** * Android Zip压缩解压缩 * @author Ren.xia * @version 1.0 * @updated 26-七月-2010 13:04:27 */ public class XZip { public XZip(){ } /** * 取得压缩包中的 文件列表(文件夹,文件自选) * @param zipFileString 压缩包名字 * @param bContainFolder 是否包括 文件夹 * @param bContainFile 是否包括 文件 * @return * @throws Exception */ public static java.util.List<java.io.File> GetFileList(String zipFileString, boolean bContainFolder, boolean bContainFile)throws Exception { android.util.Log.v("XZip", "GetFileList(String)"); java.util.List<java.io.File> fileList = new java.util.ArrayList<java.io.File>(); java.util.zip.ZipInputStream inZip = new java.util.zip.ZipInputStream(new java.io.FileInputStream(zipFileString)); java.util.zip.ZipEntry zipEntry; String szName = ""; while ((zipEntry = inZip.getNextEntry()) != null) { szName = zipEntry.getName(); if (zipEntry.isDirectory()) { // get the folder name of the widget szName = szName.substring(0, szName.length() - 1); java.io.File folder = new java.io.File(szName); if (bContainFolder) { fileList.add(folder); } } else { java.io.File file = new java.io.File(szName); if (bContainFile) { fileList.add(file); } } }//end of while inZip.close(); return fileList; } /** * 返回压缩包中的文件InputStream * @param zipFileString 压缩文件的名字 * @param fileString 解压文件的名字 * @return InputStream * @throws Exception */ public static java.io.InputStream UpZip(String zipFileString, String fileString)throws Exception { android.util.Log.v("XZip", "UpZip(String, String)"); java.util.zip.ZipFile zipFile = new java.util.zip.ZipFile(zipFileString); java.util.zip.ZipEntry zipEntry = zipFile.getEntry(fileString); return zipFile.getInputStream(zipEntry); } /** * 解压一个压缩文档 到指定位置 * @param zipFileString 压缩包的名字 * @param outPathString 指定的路径 * @throws Exception */ public static void UnZipFolder(String zipFileString, String outPathString)throws Exception { android.util.Log.v("XZip", "UnZipFolder(String, String)"); java.util.zip.ZipInputStream inZip = new java.util.zip.ZipInputStream(new java.io.FileInputStream(zipFileString)); java.util.zip.ZipEntry zipEntry; String szName = ""; while ((zipEntry = inZip.getNextEntry()) != null) { szName = zipEntry.getName(); if (zipEntry.isDirectory()) { // get the folder name of the widget szName = szName.substring(0, szName.length() - 1); java.io.File folder = new java.io.File(outPathString + java.io.File.separator + szName); folder.mkdirs(); } else { java.io.File file = new java.io.File(outPathString + java.io.File.separator + szName); file.createNewFile(); // get the output stream of the file java.io.FileOutputStream out = new java.io.FileOutputStream(file); int len; byte[] buffer = new byte[1024]; // read (len) bytes into buffer while ((len = inZip.read(buffer)) != -1) { // write (len) byte from buffer at the position 0 out.write(buffer, 0, len); out.flush(); } out.close(); } }//end of while inZip.close(); }//end of func /** * 压缩文件,文件夹 * @param srcFileString 要压缩的文件/文件夹名字 * @param zipFileString 指定压缩的目的和名字 * @throws Exception */ public static void ZipFolder(String srcFileString, String zipFileString)throws Exception { android.util.Log.v("XZip", "ZipFolder(String, String)"); //创建Zip包 java.util.zip.ZipOutputStream outZip = new java.util.zip.ZipOutputStream(new java.io.FileOutputStream(zipFileString)); //打开要输出的文件 java.io.File file = new java.io.File(srcFileString); //压缩 ZipFiles(file.getParent()+java.io.File.separator, file.getName(), outZip); //完成,关闭 outZip.finish(); outZip.close(); }//end of func /** * 压缩文件 * @param folderString * @param fileString * @param zipOutputSteam * @throws Exception */ private static void ZipFiles(String folderString, String fileString, java.util.zip.ZipOutputStream zipOutputSteam)throws Exception{ android.util.Log.v("XZip", "ZipFiles(String, String, ZipOutputStream)"); if(zipOutputSteam == null) return; java.io.File file = new java.io.File(folderString+fileString); //判断是不是文件 if (file.isFile()) { java.util.zip.ZipEntry zipEntry = new java.util.zip.ZipEntry(fileString); java.io.FileInputStream inputStream = new java.io.FileInputStream(file); zipOutputSteam.putNextEntry(zipEntry); int len; byte[] buffer = new byte[4096]; while((len=inputStream.read(buffer)) != -1) { zipOutputSteam.write(buffer, 0, len); } zipOutputSteam.closeEntry(); } else { //文件夹的方式,获取文件夹下的子文件 String fileList[] = file.list(); //如果没有子文件, 则添加进去即可 if (fileList.length <= 0) { java.util.zip.ZipEntry zipEntry = new java.util.zip.ZipEntry(fileString+java.io.File.separator); zipOutputSteam.putNextEntry(zipEntry); zipOutputSteam.closeEntry(); } //如果有子文件, 遍历子文件 for (int i = 0; i < fileList.length; i++) { ZipFiles(folderString, fileString+java.io.File.separator+fileList[i], zipOutputSteam); }//end of for }//end of if }//end of func public void finalize() throws Throwable { } }