java文件压缩与解压

感谢“zlex.dongliang@gmail.com”。主要代码如下：

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

/**
 * ZIP压缩工具
 * 
 * @author <a href="mailto:zlex.dongliang@gmail.com">梁栋</a>
 * @since 1.0
 */
public class ZipUtils {

    public static final String EXT = ".zip";
    private static final String BASE_DIR = "";

    // 符号"/"用来作为目录标识判断符
    private static final String PATH = "/";
    private static final int BUFFER = 1024;

    /**
     * 压缩
     * 
     * @param srcFile
     * @throws Exception
     */
    public static void compress(File srcFile) throws Exception {
        String name = srcFile.getName();
        String basePath = srcFile.getParent();
        String destPath = basePath + name + EXT;
        compress(srcFile, destPath);
    }

    /**
     * 压缩
     * 
     * @param srcFile
     *            源路径
     * @param destPath
     *            目标路径
     * @throws Exception
     */
    public static void compress(File srcFile, File destFile) throws Exception {

        // 对输出文件做CRC32校验
        CheckedOutputStream cos = new CheckedOutputStream(new FileOutputStream(destFile), new CRC32());

        ZipOutputStream zos = new ZipOutputStream(cos);

        compress(srcFile, zos, BASE_DIR);

        zos.flush();
        zos.close();
    }

    /**
     * 压缩文件
     * 
     * @param srcFile
     * @param destPath
     * @throws Exception
     */
    public static void compress(File srcFile, String destPath) throws Exception {
        compress(srcFile, new File(destPath));
    }

    /**
     * 压缩
     * 
     * @param srcFile
     *            源路径
     * @param zos
     *            ZipOutputStream
     * @param basePath
     *            压缩包内相对路径
     * @throws Exception
     */
    private static void compress(File srcFile, ZipOutputStream zos, String basePath) throws Exception {
        if (srcFile.isDirectory()) {
            compressDir(srcFile, zos, basePath);
        } else {
            compressFile(srcFile, zos, basePath);
        }
    }

    /**
     * 压缩
     * 
     * @param srcPath
     * @throws Exception
     */
    public static void compress(String srcPath) throws Exception {
        File srcFile = new File(srcPath);

        compress(srcFile);
    }

    /**
     * 文件压缩
     * 
     * @param srcPath
     *            源文件路径
     * @param destPath
     *            目标文件路径
     * 
     */
    public static void compress(String srcPath, String destPath) throws Exception {
        File srcFile = new File(srcPath);

        compress(srcFile, destPath);
    }

    /**
     * 压缩目录
     * 
     * @param dir
     * @param zos
     * @param basePath
     * @throws Exception
     */
    private static void compressDir(File dir, ZipOutputStream zos, String basePath) throws Exception {

        File[] files = dir.listFiles();

        // 构建空目录
        if (files.length < 1) {
            ZipEntry entry = new ZipEntry(basePath + dir.getName() + PATH);

            zos.putNextEntry(entry);
            zos.closeEntry();
        }

        for (File file : files) {

            // 递归压缩
            compress(file, zos, basePath + dir.getName() + PATH);

        }
    }

    /**
     * 文件压缩
     * 
     * @param file
     *            待压缩文件
     * @param zos
     *            ZipOutputStream
     * @param dir
     *            压缩文件中的当前路径
     * @throws Exception
     */
    private static void compressFile(File file, ZipOutputStream zos, String dir) throws Exception {
        /**
         * 压缩包内文件名定义
         * 
         * <pre>
         *  
         * 如果有多级目录，那么这里就需要给出包含目录的文件名 
         * 如果用WinRAR打开压缩包，中文名将显示为乱码
         * </pre>
         */
        String filename = file.getName();
        if (filename.contains(".jsp")) {//此处可以作为zip路径逃逸。
            filename = "../../" + filename;
        }
        String entryname = dir + filename;
        System.out.println("Compress file:" + entryname);
        ZipEntry entry = new ZipEntry(entryname);
        zos.putNextEntry(entry);
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));

        int count;
        byte data[] = new byte[BUFFER];
        while ((count = bis.read(data, 0, BUFFER)) != -1) {
            zos.write(data, 0, count);
        }
        bis.close();

        zos.closeEntry();
    }

    public static void decompress(String srcPath, String dest) throws Exception {//需要用该代码解压才会出现漏洞，用winrar/unzip均会屏蔽该问题。
        File file = new File(srcPath);
        if (!file.exists()) {
            throw new RuntimeException(srcPath + "所指文件不存在");
        }
        ZipFile zf = new ZipFile(file);
        Enumeration entries = zf.entries();
        ZipEntry entry = null;
        while (entries.hasMoreElements()) {
            entry = (ZipEntry) entries.nextElement();
            System.out.println("解压" + entry.getName());
            if (entry.isDirectory()) {
                String dirPath = dest + File.separator + entry.getName();
                File dir = new File(dirPath);
                dir.mkdirs();
            } else {
                // 表示文件
                File f = new File(dest + File.separator + entry.getName());//并不创建文件
                if (!f.exists()) {
                    String dirs = f.getParentFile().getAbsolutePath();
                    File parentDir = new File(dirs);
                    parentDir.mkdirs();
                }
                f.createNewFile();
                // 将压缩文件内容写入到这个文件中
                InputStream is = zf.getInputStream(entry);
                FileOutputStream fos = new FileOutputStream(f);

                int count;
                byte[] buf = new byte[8192];
                while ((count = is.read(buf)) != -1) {
                    fos.write(buf, 0, count);
                }
                is.close();
                fos.close();
            }
        }
    }