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本文实例讲述了Android实现zip文件压缩及解压缩的方法。分享给大家供大家参考。具体如下:
DirTraversal.java如下:
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 recursionpublic 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]);elseSystem.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]);elseSystem.out.println(file[i].getAbsolutePath());}} else {System.out.println(tmp.getAbsolutePath());}}return list;}//recursionpublic 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;}}
ZipUtils.java如下:
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();}}}
希望本文所述对大家的Android程序设计有所帮助。