Java实现ZIP解压缩，javazip解压缩,package com.

Java实现ZIP解压缩，javazip解压缩,package com.

package com.lanp;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.util.zip.ZipEntry;import java.util.zip.ZipException;import java.util.zip.ZipFile;import java.util.zip.ZipInputStream;/** * 解压ZIP压缩文件到指定的目录 * @author LanP * @since 2012-3-13 8:57:18 */public final class ZipToFile {    /**     * 缓存区大小默认20480     */    private final static int FILE_BUFFER_SIZE = 20480;    private ZipToFile() {    }    /**     * 将指定目录的ZIP压缩文件解压到指定的目录     * @param zipFilePath       ZIP压缩文件的路径     * @param zipFileName       ZIP压缩文件名字     * @param targetFileDir     ZIP压缩文件要解压到的目录     * @return flag             布尔返回值     */    public static boolean unzip(String zipFilePath, String zipFileName, String targetFileDir){        boolean flag = false;        //1.判断压缩文件是否存在，以及里面的内容是否为空        File file = null;           //压缩文件(带路径)        ZipFile zipFile = null;        file = new File(zipFilePath + "/" + zipFileName);        System.out.println(">>>>>>解压文件【" + zipFilePath + "/" + zipFileName + "】到【" + targetFileDir + "】目录下<<<<<<");        if(false == file.exists()) {            System.out.println(">>>>>>压缩文件【" + zipFilePath + "/" + zipFileName + "】不存在<<<<<<");            return false;        } else if(0 == file.length()) {            System.out.println(">>>>>>压缩文件【" + zipFilePath + "/" + zipFileName + "】大小为0不需要解压<<<<<<");            return false;        } else {            //2.开始解压ZIP压缩文件的处理            byte[] buf = new byte[FILE_BUFFER_SIZE];            int readSize = -1;            ZipInputStream zis = null;            FileOutputStream fos = null;            try {                // 检查是否是zip文件                zipFile = new ZipFile(file);                zipFile.close();                // 判断目标目录是否存在，不存在则创建                File newdir = new File(targetFileDir);                if (false == newdir.exists()) {                    newdir.mkdirs();                    newdir = null;                }                zis = new ZipInputStream(new FileInputStream(file));                ZipEntry zipEntry = zis.getNextEntry();                // 开始对压缩包内文件进行处理                while (null != zipEntry) {                    String zipEntryName = zipEntry.getName().replace('\\\\', '/');                    //判断zipEntry是否为目录，如果是，则创建                    if(zipEntry.isDirectory()) {                        int indexNumber = zipEntryName.lastIndexOf('/');                        File entryDirs = new File(targetFileDir + "/" + zipEntryName.substring(0, indexNumber));                        entryDirs.mkdirs();                        entryDirs = null;                    } else {                        try {                            fos = new FileOutputStream(targetFileDir + "/" + zipEntryName);                            while ((readSize = zis.read(buf, 0, FILE_BUFFER_SIZE)) != -1) {                                fos.write(buf, 0, readSize);                            }                        } catch (Exception e) {                            e.printStackTrace();                            throw new RuntimeException(e.getCause());                         } finally {                            try {                                if (null != fos) {                                    fos.close();                                }                            } catch (IOException e) {                                e.printStackTrace();                                throw new RuntimeException(e.getCause());                             }                        }                    }                    zipEntry = zis.getNextEntry();                }                flag = true;            } catch (ZipException e) {                e.printStackTrace();                throw new RuntimeException(e.getCause());             } catch (IOException e) {                e.printStackTrace();                throw new RuntimeException(e.getCause());             } finally {                try {                    if (null != zis) {                        zis.close();                    }                    if (null != fos) {                        fos.close();                    }                } catch (IOException e) {                    e.printStackTrace();                    throw new RuntimeException(e.getCause());                 }            }        }        return flag;    }    /**     * 测试用的Main方法     */    public static void main(String[] args) {        String zipFilePath = "C:\\\\home";        String zipFileName = "lp20120301.zip";        String targetFileDir = "C:\\\\home\\\\lp20120301";        boolean flag = ZipToFile.unzip(zipFilePath, zipFileName, targetFileDir);        if(flag) {            System.out.println(">>>>>>解压成功<<<<<<");        } else {            System.out.println(">>>>>>解压失败<<<<<<");        }    }}//该片段来自于http://byrx.net