java 实现文件压缩

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.util.ArrayList; import java.util.Collection; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; /** * <p>实现文件压缩</p> * @author tangw 2010-12-27 * */ public class ZipManager { private static ZipManager instance; private static final int BUFF_SIZE = 1024 * 1024; //1M Byte /** * get ZipManager * @return ZipManager */ public synchronized static ZipManager getInstance(){ if( instance == null ){ instance = new ZipManager(); } return instance; } /** * <p>批量或单个压缩文件</p> * @author tangw 2010-12-27 * @param resFileList 源文件列表 * @param zipFile 压缩文件 * @throws IOException */ public static void batchZipFiles(Collection<File> resFileList, File zipFile) throws IOException { //创建压缩文件 ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile), BUFF_SIZE)); for (File resFile : resFileList) { byte buffer[] = new byte[BUFF_SIZE]; BufferedInputStream in = new BufferedInputStream(new FileInputStream(resFile), BUFF_SIZE); //新增zip输出流 zipout.putNextEntry(new ZipEntry(resFile.getName())); int realLength; //写入 while ((realLength = in.read(buffer)) != -1) { zipout.write(buffer, 0, realLength); } in.close(); zipout.flush(); zipout.closeEntry(); } zipout.close(); } /** * <p>测试方法</p> * @author tangw 2010-12-27 * @param args */ public static void main(String[] args) { Collection<File> resFileList = new ArrayList<File>(); resFileList.add(new File("E://im//deps_last.xml")); //resFileList.add(new File("E://im//user_last.xml")); //File zipFile = new File("e://im//depuser.zip"); File zipFile = new File("e://im//deps_last.zip"); try { batchZipFiles(resFileList,zipFile); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }