java对文件的操作(三)----------------压缩文件
package com.tw.file.util;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;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.util.ArrayList;import java.util.Collection;import java.util.Enumeration;import java.util.zip.ZipEntry;import java.util.zip.ZipFile;import java.util.zip.ZipOutputStream;public class Zip2Utils {/** * @param args */public static void main(String[] args) { Collection<File> resFileList = new ArrayList<File>(); resFileList.add(new File("E:\\1.txt")); resFileList.add(new File("E:\\2.txt")); File zipFile = new File("e:\\txxxt.zip"); try {Zip2Utils.zipFiles(resFileList, zipFile); //测试OK} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} } 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 当压缩过程出错时抛出 */ public static void upZipFile(File zipFile, String folderPath) throws IOException { ZipFile zf = new ZipFile(zipFile); for (Enumeration entries = zf.entries(); entries.hasMoreElements();) { ZipEntry entry = ((ZipEntry) entries.nextElement()); InputStream in = zf.getInputStream(entry); OutputStream out = new FileOutputStream(folderPath + File.separator + entry.getName()); byte buffer[] = new byte[BUFF_SIZE]; int realLength; while ((realLength = in.read(buffer)) > 0) { out.write(buffer, 0, realLength); } in.close(); out.close(); } } private static void zipFile(File resFile, ZipOutputStream zipout, String rootpath) throws IOException { rootpath = rootpath + (rootpath.trim().length() == 0 ? "" : File.separator) + resFile.getName(); 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(); } } }