文件解压缩

package com.framework.common.util;



import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.zip.ZipException;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;
 


public class ZipUtils {
    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 当解压缩过程出错时抛出
     */
    public static void upZipFile(File zipFile, String folderPath) throws ZipException, IOException {


        ZipFile zf = new ZipFile(zipFile);
        for (Enumeration<?> entries = zf.getEntries(); entries.hasMoreElements();) {
            ZipEntry entry = ((ZipEntry)entries.nextElement());
            
            if(entry.isDirectory()){
                String dirPath = folderPath + File.separator+entry.getName();
                File dir = new File(dirPath);
                if(!dir.exists())
                    dir.mkdirs();
                continue;
            }
           
            InputStream in = zf.getInputStream(entry);
            String str = folderPath + File.separator + entry.getName();
            //str = new String(str.getBytes("8859_1"), "GB2312");

            File desFile = new File(str);

            if (!desFile.exists()) {
                File fileParentDir = desFile.getParentFile();
                if (!fileParentDir.exists()) {
                    fileParentDir.mkdirs();

                }
                desFile.createNewFile();
            }
            OutputStream out = new FileOutputStream(desFile);

            byte buffer[] = new byte[BUFF_SIZE];

            int realLength;

            while ((realLength = in.read(buffer)) > 0) {

                out.write(buffer, 0, realLength);

            }

            in.close();

            out.close();

        }

    }

    /**
     * 解压文件名包含传入文字的文件
     *
     * @param zipFile 压缩文件
     * @param folderPath 目标文件夹
     * @param nameContains 传入的文件匹配名
     * @throws ZipException 压缩格式有误时抛出
     * @throws IOException IO错误时抛出
     */
    public static ArrayList<File> upZipSelectedFile(File zipFile, String folderPath,
            String nameContains) throws ZipException, IOException {
        ArrayList<File> fileList = new ArrayList<File>();
        File desDir = new File(folderPath);
        if (!desDir.exists()) {
            desDir.mkdir();
        }
        ZipFile zf = new ZipFile(zipFile);
        for (Enumeration<?> entries = zf.getEntries(); entries.hasMoreElements();) {
            ZipEntry entry = ((ZipEntry)entries.nextElement());
            if (entry.getName().contains(nameContains)) {
                InputStream in = zf.getInputStream(entry);
                String str = folderPath + File.separator + entry.getName();
                str = new String(str.getBytes("8859_1"), "GB2312");
                // str.getBytes("GB2312"),"8859_1" ���
                // str.getBytes("8859_1"),"GB2312" ����
                File desFile = new File(str);
                if (!desFile.exists()) {
                    File fileParentDir = desFile.getParentFile();
                    if (!fileParentDir.exists()) {
                        fileParentDir.mkdirs();
                    }
                    desFile.createNewFile();
                }
                OutputStream out = new FileOutputStream(desFile);
                byte buffer[] = new byte[BUFF_SIZE];
                int realLength;
                while ((realLength = in.read(buffer)) > 0) {
                    out.write(buffer, 0, realLength);
                }
                in.close();
                out.close();
                fileList.add(desFile);

            }
        }

        return fileList;

    }

    /**
     * 获得压缩文件内文件列表
     *
     * @param zipFile 压缩文件
     * @return 压缩文件内文件名称
     * @throws ZipException 压缩文件格式有误时抛出
     * @throws IOException 当解压缩过程出错时抛出
     */
    public static ArrayList<String> getEntriesNames(File zipFile) throws ZipException, IOException {
        ArrayList<String> entryNames = new ArrayList<String>();
        Enumeration<?> entries = getEntriesEnumeration(zipFile);
        while (entries.hasMoreElements()) {
            ZipEntry entry = ((ZipEntry)entries.nextElement());
            entryNames.add(new String(getEntryName(entry).getBytes("GB2312"), "8859_1"));
        }
        return entryNames;
    }

    /**
        * 获得压缩文件内压缩文件对象以取得其属性
        *
        * @param zipFile 压缩文件
        * @return 返回一个压缩文件列表
        * @throws ZipException 压缩文件格式有误时抛出
        * @throws IOException IO操作有误时抛出
        */
       public static Enumeration<?> getEntriesEnumeration(File zipFile) throws ZipException,
               IOException {
           ZipFile zf = new ZipFile(zipFile);
           return zf.getEntries();
       }
       /**
        * 取得压缩文件对象的注释
        *
        * @param entry 压缩文件对象
        * @return 压缩文件对象的注释
        * @throws UnsupportedEncodingException
        */
       public static String getEntryComment(ZipEntry entry) throws UnsupportedEncodingException {
           return new String(entry.getComment().getBytes("GB2312"), "8859_1");
       }

       /**
        * 取得压缩文件对象的名称
        *
        * @param entry 压缩文件对象
        * @return 压缩文件对象的名称
        * @throws UnsupportedEncodingException
        */
      public static String getEntryName(ZipEntry entry) throws UnsupportedEncodingException {
          return new String(entry.getName().getBytes("GB2312"), "8859_1");

      }


      /**
      * 压缩文件
      *
      * @param resFile 需要压缩的文件（夹）
      * @param zipout 压缩的目的文件
      * @param rootpath 压缩的文件路径
      * @throws FileNotFoundException 找不到文件时抛出
      * @throws IOException 当压缩过程出错时抛出
      */
     private static void zipFile(File resFile, ZipOutputStream zipout, String rootpath)
             throws FileNotFoundException, IOException {
         rootpath = rootpath + (rootpath.trim().length() == 0 ? "" : File.separator)
                 + resFile.getName();
         rootpath = new String(rootpath.getBytes("8859_1"), "GB2312");
         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;
             int pos= 0;
             while ((realLength = in.read(buffer)) != -1) {
                 zipout.write(buffer, pos, realLength);
                 //pos+=realLength;
             }
             in.close();
             zipout.flush();

             zipout.closeEntry();

         }
     }

}