java版的压缩

package jframework.commons.util;

002 

003import java.io.BufferedInputStream;

004import java.io.BufferedOutputStream;

005import java.io.File;

006import java.io.FileInputStream;

007import java.io.FileNotFoundException;

008import java.io.FileOutputStream;

009import java.io.IOException;

010import java.io.InputStream;

011import java.io.OutputStream;

012import java.util.ArrayList;

013import java.util.Enumeration;

014import java.util.List;

015import org.apache.tools.zip.ZipEntry;

016import org.apache.tools.zip.ZipFile;

017import org.apache.tools.zip.ZipOutputStream;

018 

019/**

020* @author WYY

021* @description 压缩工具类

022*/

023public class ZipTool

024{

025    publicstatic final int BUFFER = 1024;// 缓存大小

026 

027    /**

028     * @description 压缩文件或目录（包含子目录压缩）

029     * @updated by WYY 2013年11月14日 下午10:11:34

030     * @param baseDir

031     *            待压缩目录或文件

032     * @param dest

033     *            要所后的文件名

034     */

035    publicstatic void zip(String baseDir, String dest)

036    {

037        File sourceFile =new File(baseDir);

038        File destFile =new File(dest);

039        ZipOutputStream zos =null;

040        try

041        {

042            if(sourceFile.isFile())

043            {// 单个文件压缩

044                zos =new ZipOutputStream(newFileOutputStream(destFile));

045                zipFile(baseDir, sourceFile, zos);

046            }

047            else

048            {// 文件夹压缩

049                List<File> fileList = getSubFiles(sourceFile);

050                zos =new ZipOutputStream(newFileOutputStream(destFile));

051                for(int i = 0; i < fileList.size(); i++)

052                {

053                    File subFile = (File) fileList.get(i);

054                    zipFile(baseDir, subFile, zos);

055                }

056            }

057        }

058        catch(IOException e)

059        {

060            e.getMessage();

061        }

062        finally

063        {

064            IOUtil.closeQuietly(zos);

065        }

066    }

067 

068    /**

069     * @description 压缩文件

070     * @updated by WYY 2013年11月14日 下午10:13:11

071     * @param baseDir

072     *            基本目录

073     * @param file

074     *            本次压缩的文件

075     * @param zos

076     * @throws IOException

077     * @throws FileNotFoundException

078     */

079    privatestatic void zipFile(String baseDir, File file, ZipOutputStream zos) throwsIOException,

080            FileNotFoundException

081    {

082        byte[] buf =new byte[BUFFER];

083        intreadLen = 0;

084        ZipEntry ze =new ZipEntry(getAbsFileName(baseDir, file));

085        ze.setSize(file.length());

086        ze.setTime(file.lastModified());

087        zos.putNextEntry(ze);

088        InputStream is =new BufferedInputStream(newFileInputStream(file));

089        while((readLen = is.read(buf, 0, BUFFER)) != -1)

090        {

091            zos.write(buf,0, readLen);

092        }

093        IOUtil.closeQuietly(is);

094    }

095 

096    /**

097     * 给定根目录，返回另一个文件名的相对路径，用于zip文件中的路径.

098     *

099     * @param baseDir

100     *            java.lang.String 根目录

101     * @param realFileName

102     *            java.io.File 实际的文件名

103     * @return 相对文件名

104     */

105    privatestatic String getAbsFileName(String baseDir, File realFileName)

106    {

107        File real = realFileName;

108        File base =new File(baseDir);

109        String ret = real.getName();

110        if(real.equals(base))// baseDir 为文件时，直接返回

111        {

112            returnret;

113        }

114        else

115        {

116            while(true)

117            {

118                real = real.getParentFile();

119                if(real == null)

120                    break;

121                if(real.equals(base))

122                    break;

123                else

124                    ret = real.getName() +"/" + ret;

125            }

126        }

127        returnret;

128    }

129 

130    /**

131     * 取得指定目录下的所有文件列表，包括子目录下的文件.

132     *

133     * @param baseDir

134     *            File 指定的目录

135     * @return 包含java.io.File的List

136     */

137    privatestatic List<File> getSubFiles(File baseDir)

138    {

139        List<File> ret =new ArrayList<File>();

140        File[] tmp = baseDir.listFiles();

141        for(int i = 0; i < tmp.length; i++)

142        {

143            if(tmp[i].isFile())

144                ret.add(tmp[i]);

145            if(tmp[i].isDirectory())

146                ret.addAll(getSubFiles(tmp[i]));

147        }

148        returnret;

149    }

150 

151    /**

152     * 解压缩功能. 将zipFile文件解压到zipDir目录下.

153     *

154     * @throws Exception

155     */

156    publicstatic void unzip(String zipDir, String zipFile)

157    {

158        ZipFile zfile =null;

159        InputStream is =null;

160        OutputStream os =null;

161        try

162        {

163            zfile =new ZipFile(zipFile);

164            Enumeration<?> zList = zfile.getEntries();

165            ZipEntry ze =null;

166            byte[] buf =new byte[1024];

167            while(zList.hasMoreElements())

168            {

169                ze = (ZipEntry) zList.nextElement();

170                if(ze.isDirectory())

171                {

172                    File f =new File(zipDir + ze.getName());

173                    f.mkdir();

174                    continue;

175                }

176                os =new BufferedOutputStream(newFileOutputStream(getRealFileName(zipDir, ze.getName())));

177                is =new BufferedInputStream(zfile.getInputStream(ze));

178                intreadLen = 0;

179                while((readLen = is.read(buf, 0,1024)) != -1)

180                {

181                    os.write(buf,0, readLen);

182                }

183                IOUtil.closeQuietly(is);

184                IOUtil.closeQuietly(os);

185            }

186            zfile.close();

187        }

188        catch(IOException e)

189        {

190            e.printStackTrace();

191        }

192        finally

193        {

194            IOUtil.closeQuietly(is);

195            IOUtil.closeQuietly(os);

196            try

197            {

198                if(null != zfile)

199                {

200                    zfile.close();

201                }

202            }

203            catch(IOException ex)

204            {

205                // ignore

206            }

207        }

208    }

209 

210    /**

211     * 给定根目录，返回一个相对路径所对应的实际文件名.

212     *

213     * @param baseDir

214     *            指定根目录

215     * @param absFileName

216     *            相对路径名，来自于ZipEntry中的name

217     * @return java.io.File 实际的文件

218     */

219    publicstatic File getRealFileName(String baseDir, String absFileName)

220    {

221        String[] dirs = absFileName.split("/");

222        File ret =new File(baseDir);

223        if(dirs.length > 1)

224        {

225            for(int i = 0; i < dirs.length -1; i++)

226            {

227                ret =new File(ret, dirs[i]);

228            }

229            if(!ret.exists())

230                ret.mkdirs();

231            ret =new File(ret, dirs[dirs.length -1]);

232            returnret;

233        }

234        ret =new File(ret, dirs[dirs.length -1]);

235        returnret;

236    }

237 

238    publicstatic void main(String[] args) throws Exception

239    {

240        // 测试

241        ZipTool.zip("E:/mdf","E:/mdf/22.zip");

242        ZipTool.unzip("E:/mdf","E:/mdf/22.zip");

243    }

244}

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01package jframework.commons.util;

02 

03import java.io.Closeable;

04import java.io.IOException;

05 

06/**

07* @author WYY

08* @description

09*/

10public class IOUtil

11{

12 

13    /**

14     * @description 关闭流

15     * @updated by WYY 2013年11月14日 下午10:10:25

16     * @param closeable

17     */

18    publicstatic void closeQuietly(Closeable closeable)

19    {

20        try

21        {

22            if(null != closeable)

23            {

24                closeable.close();

25            }

26        }

27        catch(IOException e)

28        {

29            // ignore

30        }

31    }

32}