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 block
			e.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(); 
             } 
     } 


}