zip解压(解决中文乱码)

本文来源：http://code.google.com/p/javawing/source/browse/trunk/Utils/src/org/javawing/util/ZipUtil.java?r=63

/**
 * $Log: ZipCompress.java,v $
 */


package org.javawing.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.util.Enumeration;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.Deflater;
import java.util.zip.ZipException;

import org.apache.log4j.Logger;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;

/**
 *
 @brief
 *   <p><b>Zip file tool class</b></p>
 * 
 *  &nbsp;&nbsp;&nbsp;&nbsp; compress and decompress file
 * 
 *  <p><center>COPYRIGHT (C) 2009,RiseTek Systems Inc.All Rights Reserved.</center></p>
 *  @author TangJian
 *  @version 1.0
 *  @see 
 *  @since 2009-12-10
 */


public class ZipUtil {

        private static boolean isCreateSrcDir = false;//是否创建源目录

        private static Logger log = Logger.getLogger(ZipUtil.class.getName());
        
        /**
         * @param args
         * @throws IOException
         */
        public static void main(String[] args) throws IOException {
                String src = "e:/temp/src";//指定压缩源，可以是目录或文件
                String decompressDir = "e:/temp/decompress";//解压路径
                String archive = "e:/temp/test.wid";//压缩包路径
                String comment = "Java Zip [e-mail]";//压缩包注释

                //----压缩文件或目录
                writeByApacheZipOutputStream(src, archive, comment);

                //----使用apace ZipFile读取压缩文件
                readByApacheZipFile(archive, decompressDir);
                
//              File file = new File(archive);
//              readByApacheZipFile(file, decompressDir);
        }

        public static void writeByApacheZipOutputStream(String src, String archive,
                        String comment) throws FileNotFoundException, IOException {
                //----压缩文件：
                FileOutputStream f = new FileOutputStream(archive);
                //使用指定校验和创建输出流
                CheckedOutputStream csum = new CheckedOutputStream(f, new CRC32());

                ZipOutputStream zos = new ZipOutputStream(csum);
                //支持中文
                zos.setEncoding("GBK");
                BufferedOutputStream out = new BufferedOutputStream(zos);
                //设置压缩包注释
                zos.setComment(comment);
                //启用压缩
                zos.setMethod(ZipOutputStream.DEFLATED);
                //压缩级别为最强压缩，但时间要花得多一点
                zos.setLevel(Deflater.BEST_COMPRESSION);

                File srcFile = new File(src);

                if (!srcFile.exists() || (srcFile.isDirectory() && srcFile.list().length == 0)) {
                        throw new FileNotFoundException(
                                        "File must exist and  ZIP file must have at least one entry.");
                }
                //获取压缩源所在父目录
                src = src.replaceAll("\\\\", "/");
                String prefixDir = null;
                if (srcFile.isFile()) {
                        prefixDir = src.substring(0, src.lastIndexOf("/") + 1);
                } else {
                        prefixDir = (src.replaceAll("/$", "") + "/");
                }

                //如果不是根目录
                if (prefixDir.indexOf("/") != (prefixDir.length() - 1) && isCreateSrcDir) {
                        prefixDir = prefixDir.replaceAll("[^/]+/$", "");
                }

                //开始压缩
                writeRecursive(zos, out, srcFile, prefixDir);

                out.close();
                // 注：校验和要在流关闭后才准备，一定要放在流被关闭后使用
                log.info("Checksum: " + csum.getChecksum().getValue());
        }

        public static void readByApacheZipFile(File file, String decompressDir)
                        throws IOException, FileNotFoundException, ZipException {

                ZipFile zf = new ZipFile(file, "GBK");// 支持中文

                readByApacheZipFile(decompressDir, zf);
        }
        
        /**
         * 使用 org.apache.tools.zip.ZipFile 解压文件，它与 java 类库中的
         * java.util.zip.ZipFile 使用方式是一致的，只不过多了设置编码方式的
         * 接口。
         * 
         * 注，apache 没有提供 ZipInputStream 类，所以只能使用它提供的ZipFile
         * 来读取压缩文件。
         * @param archive 压缩包路径
         * @param decompressDir 解压路径
         * @throws IOException
         * @throws FileNotFoundException
         * @throws ZipException
         */
        public static void readByApacheZipFile(String archive, String decompressDir)
                        throws IOException, FileNotFoundException, ZipException {

                ZipFile zf = new ZipFile(archive, "GBK");//支持中文
                readByApacheZipFile(decompressDir, zf);
                
        }

        /**
         * @brief
         * main extract method
         * 
         * @param decompressDir
         * @param zf
         * @throws FileNotFoundException
         * @throws IOException
         * @throws ZipException
         */
        private static void readByApacheZipFile(String decompressDir, ZipFile zf)
                        throws FileNotFoundException, IOException, ZipException {
                BufferedInputStream bi;
                Enumeration<?> e = zf.getEntries();
                while (e.hasMoreElements()) {
                        ZipEntry ze2 = (ZipEntry) e.nextElement();
                        String entryName = ze2.getName();
                        String path = decompressDir + "/" + entryName;
                        if (ze2.isDirectory()) {
                                log.info("正在创建解压目录 - " + entryName);
                                File decompressDirFile = new File(path);
                                if (!decompressDirFile.exists()) {
                                        decompressDirFile.mkdirs();
                                }
                        } else {
                                log.info("正在创建解压文件 - " + entryName);
                                String fileDir = path.substring(0, path.lastIndexOf("/"));
                                File fileDirFile = new File(fileDir);
                                if (!fileDirFile.exists()) {
                                        fileDirFile.mkdirs();
                                }
                                BufferedOutputStream bos = new BufferedOutputStream(
                                                new FileOutputStream(decompressDir + "/" + entryName));

                                bi = new BufferedInputStream(zf.getInputStream(ze2));
                                byte[] readContent = new byte[1024];
                                int readCount = bi.read(readContent);
                                while (readCount != -1) {
                                        //解压对文件二进制加密
                                        bos.write(readContent, 0, readCount);
                                        readCount = bi.read(readContent);
                                }
                                bos.close();
                        }
                }
                zf.close();
        }
        
        /**
         * 递归压缩
         * 
         * 使用 org.apache.tools.zip.ZipOutputStream 类进行压缩，它的好处就是支持中文路径，
         * 而Java类库中的 java.util.zip.ZipOutputStream 压缩中文文件名时压缩包会出现乱码。
         * 使用 apache 中的这个类与 java 类库中的用法是一新的，只是能设置编码方式了。
         *  
         * @param zos
         * @param bo
         * @param srcFile
         * @param prefixDir
         * @throws IOException
         * @throws FileNotFoundException
         */
        private static void writeRecursive(ZipOutputStream zos, BufferedOutputStream bo,
                        File srcFile, String prefixDir) throws IOException, FileNotFoundException {
                ZipEntry zipEntry;

                String filePath = srcFile.getAbsolutePath().replaceAll("\\\\", "/").replaceAll(
                                "//", "/");
                if (srcFile.isDirectory()) {
                        filePath = filePath.replaceAll("/$", "") + "/";
                }
                String entryName = filePath.replace(prefixDir, "").replaceAll("/$", "");
                if (srcFile.isDirectory()) {
                        if (!"".equals(entryName)) {
                                log.info("正在创建目录 - " + srcFile.getAbsolutePath()
                                                + "  entryName=" + entryName);

                                //如果是目录，则需要在写目录后面加上 / 
                                zipEntry = new ZipEntry(entryName + "/");
                                zos.putNextEntry(zipEntry);
                        }

                        File srcFiles[] = srcFile.listFiles();
                        for (int i = 0; i < srcFiles.length; i++) {
                                writeRecursive(zos, bo, srcFiles[i], prefixDir);
                        }
                } else {
                        log.info("正在写文件 - " + srcFile.getAbsolutePath() + "  entryName="
                                        + entryName);
                        BufferedInputStream bi = new BufferedInputStream(new FileInputStream(srcFile));

                        //开始写入新的ZIP文件条目并将流定位到条目数据的开始处
                        zipEntry = new ZipEntry(entryName);
                        zos.putNextEntry(zipEntry);
                        byte[] buffer = new byte[1024];
                        int readCount = bi.read(buffer);

                        while (readCount != -1) {
                                bo.write(buffer, 0, readCount);
                                readCount = bi.read(buffer);
                        }
                        //注，在使用缓冲流写压缩文件时，一个条件完后一定要刷新一把，不
                        //然可能有的内容就会存入到后面条目中去了
                        bo.flush();
                        //文件读完后关闭
                        bi.close();
                }
        }
        
}