本文實例講述了Android實現zip文件壓縮及解壓縮的方法。分享給大家供大家參考。具體如下：
DirTraversal.java如下：
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package com.once;import java.io.File;import java.util.ArrayList;import java.util.LinkedList;/** * 文件夾遍歷 * @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; }} |
ZipUtils.java如下：
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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 實現的Zip工具 * * @author once */public class ZipUtils { private static final int BUFF_SIZE = 1024 * 1024; // 1M Byte /** * 批量壓縮文件（夾） * * @param resFileList 要壓縮的文件（夾）列表 * @param zipFile 生成的壓縮文件 * @throws IOException 當壓縮過程出錯時拋出 */ 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(); } /** * 批量壓縮文件（夾） * * @param resFileList 要壓縮的文件（夾）列表 * @param zipFile 生成的壓縮文件 * @param comment 壓縮文件的注釋 * @throws IOException 當壓縮過程出錯時拋出 */ 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(); } /** * 解壓縮一個文件 * * @param zipFile 壓縮文件 * @param folderPath 解壓縮的目標目錄 * @throws IOException 當解壓縮過程出錯時拋出 */ 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(); } } /** * 解壓文件名包含傳入文字的文件 * * @param zipFile 壓縮文件 * @param folderPath 目標文件夾 * @param nameContains 傳入的文件匹配名 * @throws ZipException 壓縮格式有誤時拋出 * @throws IOException IO錯誤時拋出 */ 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" 輸出 // str.getBytes("8859_1"),"GB2312" 輸入 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; } /** * 獲得壓縮文件內文件列表 * * @param zipFile 壓縮文件 * @return 壓縮文件內文件名稱 * @throws ZipException 壓縮文件格式有誤時拋出 * @throws IOException 當解壓縮過程出錯時拋出 */ 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; } /** * 獲得壓縮文件內壓縮文件對象以取得其屬性 * * @param zipFile 壓縮文件 * @return 返回一個壓縮文件列表 * @throws ZipException 壓縮文件格式有誤時拋出 * @throws IOException IO操作有誤時拋出 */ public static Enumeration<?> getEntriesEnumeration(File zipFile) throws ZipException, IOException { ZipFile zf = new ZipFile(zipFile); return zf.entries(); } /** * 取得壓縮文件對象的注釋 * * @param entry 壓縮文件對象 * @return 壓縮文件對象的注釋 * @throws UnsupportedEncodingException */ public static String getEntryComment(ZipEntry entry) throws UnsupportedEncodingException { return new String(entry.getComment().getBytes("GB2312"), "8859_1"); } /** * 取得壓縮文件對象的名稱 * * @param entry 壓縮文件對象 * @return 壓縮文件對象的名稱 * @throws UnsupportedEncodingException */ public static String getEntryName(ZipEntry entry) throws UnsupportedEncodingException { return new String(entry.getName().getBytes("GB2312"), "8859_1"); } /** * 壓縮文件 * * @param resFile 需要壓縮的文件（夾） * @param zipout 壓縮的目的文件 * @param rootpath 壓縮的文件路徑 * @throws FileNotFoundException 找不到文件時拋出 * @throws IOException 當壓縮過程出錯時拋出 */ 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(); } }} |
希望本文所述對大家的Android程序設計有所幫助。
