压缩和解压缩

现在很的app都有备份恢复功能。备份的时候都需要把文件打包，恢复的时候需要把文件解压。

压缩解压缩代码如下：

public class ZipUtils {/** * 解压缩功能. 将zipFile文件解压到folderPath目录下. *  * @throws Exception */public static 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()) {String dirstr = folderPath + ze.getName();// dirstr.trim();dirstr = new String(dirstr.getBytes("8859_1"), "GB2312");File f = new File(dirstr);f.mkdir();continue;}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();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 blocke.printStackTrace();}ret = new File(ret, substr);}if (!ret.exists())ret.mkdirs();substr = dirs[dirs.length - 1];try {// substr.trim();substr = new String(substr.getBytes("8859_1"), "GB2312");} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}ret = new File(ret, substr);return ret;}return ret;}/** * 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 {// 创建Zip包ZipOutputStream outZip = new ZipOutputStream(new FileOutputStream(zipFileString));// 打开要输出的文件File file = new File(srcFileString);// 压缩ZipFiles(file.getParent() + 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,ZipOutputStream zipOutputSteam) throws Exception {if (zipOutputSteam == null)return;File file = new File(folderString + fileString);// 判断是不是文件if (file.isFile()) {ZipEntry zipEntry = new ZipEntry(fileString);FileInputStream inputStream = new 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) {ZipEntry zipEntry = new ZipEntry(fileString + 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 + File.separator+ fileList[i], zipOutputSteam);}}}}