com.chinamobile.bcbsp.fault.tools.Zip.java Source code

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Here is the source code for com.chinamobile.bcbsp.fault.tools.Zip.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.chinamobile.bcbsp.fault.tools;

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.Enumeration;
import java.util.Vector;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * compress file to zip or decompress zip file.
 * @author hadoop
 *
 */
public class Zip {
    /**log handle*/
    public static final Log LOG = LogFactory.getLog(Zip.class);
    /**buffer size*/
    private static final int BUFFER = 1024;

    /**
     * Compress files to *.zip.
     * @param file
     *        : file to be compress
     * @return compressed file.
     */
    public static String compress(File file) {
        return compress(file.getAbsolutePath());
    }

    /**
     * Compress files to *.zip.
     * @param fileName
     *        file name to compress
     * @return compressed file.
     */
    public static String compress(String fileName) {
        String targetFile = null;
        File sourceFile = new File(fileName);
        Vector<File> vector = getAllFiles(sourceFile);
        try {
            if (sourceFile.isDirectory()) {
                targetFile = fileName + ".zip";
            } else {
                char ch = '.';
                targetFile = fileName.substring(0, fileName.lastIndexOf(ch)) + ".zip";
            }
            BufferedInputStream bis = null;
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(targetFile));
            ZipOutputStream zipos = new ZipOutputStream(bos);
            byte[] data = new byte[BUFFER];
            if (vector.size() > 0) {
                for (int i = 0; i < vector.size(); i++) {
                    File file = vector.get(i);
                    zipos.putNextEntry(new ZipEntry(getEntryName(fileName, file)));
                    bis = new BufferedInputStream(new FileInputStream(file));
                    int count;
                    while ((count = bis.read(data, 0, BUFFER)) != -1) {
                        zipos.write(data, 0, count);
                    }
                    bis.close();
                    zipos.closeEntry();
                }
                zipos.close();
                bos.close();
                return targetFile;
            } else {
                File zipNullfile = new File(targetFile);
                zipNullfile.getParentFile().mkdirs();
                zipNullfile.mkdir();
                return zipNullfile.getAbsolutePath();
            }
        } catch (IOException e) {
            LOG.error("[compress]", e);
            return "error";
        }
    }

    /**
     * Uncompress *.zip files.
     * @param fileName
     *        : file to be uncompress
     */
    @SuppressWarnings("unchecked")
    public static void decompress(String fileName) {
        File sourceFile = new File(fileName);
        String filePath = sourceFile.getParent() + "/";
        try {
            BufferedInputStream bis = null;
            BufferedOutputStream bos = null;
            ZipFile zipFile = new ZipFile(fileName);
            Enumeration en = zipFile.entries();
            byte[] data = new byte[BUFFER];
            while (en.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) en.nextElement();
                if (entry.isDirectory()) {
                    new File(filePath + entry.getName()).mkdirs();
                    continue;
                }
                bis = new BufferedInputStream(zipFile.getInputStream(entry));
                File file = new File(filePath + entry.getName());
                File parent = file.getParentFile();
                if (parent != null && (!parent.exists())) {
                    parent.mkdirs();
                }
                bos = new BufferedOutputStream(new FileOutputStream(file));
                int count;
                while ((count = bis.read(data, 0, BUFFER)) != -1) {
                    bos.write(data, 0, count);
                }
                bis.close();
                bos.close();
            }
            zipFile.close();
        } catch (IOException e) {
            //LOG.error("[compress]", e);
            throw new RuntimeException("[compress]", e);
        }
    }

    /**
     * To get a directory's all files.
     * @param sourceFile
     *        : the source directory
     * @return the files' collection
     */
    private static Vector<File> getAllFiles(File sourceFile) {
        Vector<File> fileVector = new Vector<File>();
        if (sourceFile.isDirectory()) {
            File[] files = sourceFile.listFiles();
            for (int i = 0; i < files.length; i++) {
                fileVector.addAll(getAllFiles(files[i]));
            }
        } else {
            fileVector.add(sourceFile);
        }
        return fileVector;
    }

    /**
     * get file entry name according to base
     * @param base
     *        base to split the total file
     * @param file
     *        file to get the entry
     * @return entry name.
     */
    private static String getEntryName(String base, File file) {
        File baseFile = new File(base);
        String filename = file.getPath();
        if (baseFile.getParentFile().getParentFile() == null) {
            return filename.substring(baseFile.getParent().length());
        } // d:/file1 /file2/text.txt
        /*d:/file1/text.txt*/
        return filename.substring(baseFile.getParent().length() + 1);
    }
}