这里写了个工具类，可以实现文件的压缩和解压功能。

package com.cntaiping.tpi.common.utils;import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.FileChannel;
import java.util.Enumeration;
import java.util.zip.ZipOutputStream;import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;public class ZipUtils {/*** zip解压* * @param zipfile*            File 需要解压缩的文件* @param descDir*            String 解压后的目标目录* @throws IOException */public static void unZipFiles(java.io.File zipfile, String descDir) throws IOException{File pathFile = new File(descDir);if (!pathFile.exists()){pathFile.mkdirs();}ZipFile zip = new ZipFile(zipfile);for (Enumeration entries = zip.getEntries(); entries.hasMoreElements();){ZipEntry entry = (ZipEntry) entries.nextElement();String zipEntryName = entry.getName();InputStream in = zip.getInputStream(entry);String outPath = (descDir + zipEntryName).replaceAll("\\*", "/");//获取当前file的父路径,这才是文件夹File file = new File(outPath.substring(0, outPath.lastIndexOf('/')));// 判断路径是否存在,不存在则创建文件路径if (!file.exists()){file.mkdirs();}// 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压if (new File(outPath).isDirectory()){continue;}OutputStream out = new FileOutputStream(outPath);byte[] buf1 = new byte[1024];int len;while ((len = in.read(buf1)) > 0){out.write(buf1, 0, len);}in.close();out.close();}}/*** 压缩指定的单个或多个文件，如果是目录，则遍历目录下所有文件进行压缩* @param zipFileName ZIP文件名包含全路径* @param files  文件列表*/public static void createZip(String zipFileName, File files)	throws Exception {ZipOutputStream zipOut = null;FileOutputStream fileOut = null;try {fileOut = new FileOutputStream(zipFileName);zipOut = new ZipOutputStream(fileOut);if (null != files) {zip(zipOut, files, files.getName());}zipOut.close(); // 输出流关闭} catch (Exception e) {e.printStackTrace();throw e;} finally{if(null!=zipOut){zipOut.close();}if(null!=fileOut){fileOut.close();}}}/*** 执行压缩* @param out ZIP输入流* @param f   被压缩的文件* @param base  被压缩的文件名*/private static void zip(ZipOutputStream out, File f, String base)throws Exception { // 方法重载FileInputStream in = null;BufferedInputStream bi = null;try {if (f.isDirectory()) {// 压缩目录File[] fl = f.listFiles();if (fl.length == 0) {out.putNextEntry(new ZipEntry(base + "/")); // 创建zip实体}for (int i = 0; i < fl.length; i++) {zip(out, fl[i], base + "/" + fl[i].getName()); // 递归遍历子文件夹}} else { // 压缩单个文件out.putNextEntry(new ZipEntry(base)); // 创建zip实体in = new FileInputStream(f);bi = new BufferedInputStream(in);byte[] bufs = new byte[1024 * 10];int read = 0;while ((read = bi.read(bufs, 0, 1024 * 10)) != -1) {out.write(bufs, 0, read);}out.closeEntry(); // 关闭zip实体}} catch (Exception e) {e.printStackTrace();throw e;} finally {if (null != bi) {bi.close();}if (null != in) {in.close();}}}/*** 获取文件大小  单位为字节* @param filePath* @return* @throws Exception*/public static long getFileSize(String filePath) throws Exception{FileChannel fc= null;FileInputStream fis=null;long fileSize=0;try {File f= new File(filePath);if (f.exists() && f.isFile()){fis= new FileInputStream(f);fc= fis.getChannel();fileSize=fc.size();}} catch (Exception e) {e.printStackTrace();throw e;} finally {if(null!= fis){fis.close();}if (null!=fc){fc.close();} }return fileSize;}	
}