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"/>