JAVA实现压缩，解压缩zip文件

package cn.gov.csrc.zip;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.Enumeration;import java.util.List;import org.apache.tools.zip.*; /** * 压缩，解压缩文件 *  * @author admin * @date 2014-03-06 * */public class ZipToFile {public static final String ZIP_FILENAME= "D:\\new\\test.zip";//需要解压缩的文件名public static final String ZIP_DIR = "D:\\admin\\";//需要压缩的文件夹public static final String ZIP_PATH = "D:\\new\\test.zip";//压缩后存放的目录和文件名称public static final String UN_ZIP_DIR = "D:\\new\\";//要解压的文件目录public static final int BUFFER = 1024 ;//缓存大小/*** zip压缩功能.* 压缩baseDir(文件夹目录)下所有文件，包括子目录* @throws Exception*/public static void zipFile(String baseDir,String fileName) throws Exception{List fileList=getSubFiles(new File(baseDir));ZipOutputStream zos=new ZipOutputStream(new FileOutputStream(fileName));ZipEntry ze=null;byte[] buf=new byte[BUFFER];int readLen=0;for(int i = 0; i <fileList.size(); i++) {File f=(File)fileList.get(i);ze=new ZipEntry(getAbsFileName(baseDir, f));ze.setSize(f.length());ze.setTime(f.lastModified());zos.putNextEntry(ze);InputStream is=new BufferedInputStream(new FileInputStream(f));while ((readLen=is.read(buf, 0, BUFFER))!=-1) {zos.write(buf, 0, readLen);}is.close();}zos.close();}/*** 给定根目录，返回另一个文件名的相对路径，用于zip文件中的路径.* @param baseDir java.lang.String 根目录* @param realFileName java.io.File 实际的文件名* @return 相对文件名*/private static String getAbsFileName(String baseDir, File realFileName){File real=realFileName;File base=new File(baseDir);String ret=real.getName();while (true) {real=real.getParentFile();if(real==null) break;if(real.equals(base)) break;elseret=real.getName()+"/"+ret;}return ret;}/*** 取得指定目录下的所有文件列表，包括子目录.* @param baseDir File 指定的目录* @return 包含java.io.File的List*/private static List getSubFiles(File baseDir){List ret=new ArrayList();File[] tmp=baseDir.listFiles();for (int i = 0; i <tmp.length; i++) {if(tmp[i].isFile())ret.add(tmp[i]);if(tmp[i].isDirectory())ret.addAll(getSubFiles(tmp[i]));}return ret;}/*** 解压缩功能.* 将ZIP_FILENAME文件解压到ZIP_DIR目录下.* @throws Exception*/public static void upZipFile() throws Exception{ZipFile zfile=new ZipFile(ZIP_FILENAME);Enumeration zList=zfile.getEntries();ZipEntry ze=null;byte[] buf=new byte[1024];while(zList.hasMoreElements()){ze=(ZipEntry)zList.nextElement();if(ze.isDirectory()){            File f=new File(ZIP_DIR+ze.getName());            f.mkdir();continue;}OutputStream os=new BufferedOutputStream(new FileOutputStream(getRealFileName(ZIP_DIR, 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();}/*** 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);if(dirs.length>1){for (int i = 0; i < dirs.length-1;i++) {ret=new File(ret, dirs[i]);}if(!ret.exists())ret.mkdirs();}return ret=new File(ret, dirs[dirs.length-1]);}public static void main(String[] args) {//压缩功能/*try {ZipToFile.zipFile(ZIP_DIR, ZIP_PATH);} catch (Exception e) {e.printStackTrace();}*///解压缩功能try {ZipToFile.upZipFile();} catch (Exception e) {e.printStackTrace();}}}