1 Java的Zip壓縮幫助類 簡介

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提供以下功能

• zip的單檔案壓縮
• 多檔案壓縮
• 資料夾壓縮
• zip壓縮包解壓等方法。

/**
 * @author zt
 */
public class ZipCompressor {
    static final int BUFFER = 8192;

    private File zipFile;

    public ZipCompressor(String pathName) {
        zipFile = new File(pathName);
    }
    public void compress(String... pathName) {
        ZipOutputStream out = null;
        try {
            FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
            CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,
                    new CRC32());
            out = new ZipOutputStream(cos);
            String basedir = "";
            for (int i=0;i<pathName.length;i++){
                compress(new File(pathName[i]), out, basedir);
            }
            out.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    public void compress(String srcPathName) {
        File file = new File(srcPathName);
        if (!file.exists()) {
            throw new RuntimeException(srcPathName + "不存在！");
        }
        try {
            FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
            CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,
                    new CRC32());
            ZipOutputStream out = new ZipOutputStream(cos);
            String basedir = "";
            compress(file, out, basedir);
            out.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private void compress(File file, ZipOutputStream out, String basedir) {
        /* 判斷是目錄還是檔案 */
        if (file.isDirectory()) {
            System.out.println("壓縮：" + basedir + file.getName());
            this.compressDirectory(file, out, basedir);
        } else {
            System.out.println("壓縮：" + basedir + file.getName());
            this.compressFile(file, out, basedir);
        }
    }

    /** 壓縮一個目錄 */
    private void compressDirectory(File dir, ZipOutputStream out, String basedir) {
        if (!dir.exists()) {
            return;
        }
        File[] files = dir.listFiles();
        for (int i = 0; i < files.length; i++) {
            /* 遞迴 */
            compress(files[i], out, basedir + dir.getName() + "/");
        }
    }

    /** 壓縮一個檔案 */
    private void compressFile(File file, ZipOutputStream out, String basedir) {
        if (!file.exists()) {
            return;
        }
        try {
            BufferedInputStream bis = new BufferedInputStream(
                    new FileInputStream(file));
            ZipEntry entry = new ZipEntry(basedir + file.getName());
            out.putNextEntry(entry);
            int count;
            byte data[] = new byte[BUFFER];
            while ((count = bis.read(data, 0, BUFFER)) != -1) {
                out.write(data, 0, count);
            }
            bis.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void unZip(File srcFile, String destDirPath) throws RuntimeException {
        long start = System.currentTimeMillis();
        // 判斷原始檔是否存在
        if (!srcFile.exists()) {
            throw new RuntimeException(srcFile.getPath() + "所指檔案不存在");
        }
        // 開始解壓
        ZipFile zipFile = null;
        try {
            zipFile = new ZipFile(srcFile, Charset.forName("gbk"));
            Enumeration<?> entries = zipFile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) entries.nextElement();
                System.out.println("解壓" + entry.getName());
                // 如果是資料夾，就建立個資料夾
                if (entry.isDirectory()) {
                    String dirPath = destDirPath + "/" + entry.getName();
                    File dir = new File(dirPath);
                    dir.mkdirs();
                } else {
                    // 如果是檔案，就先建立一個檔案，然後用io流把內容copy過去
                    File targetFile = new File(destDirPath + "/" + entry.getName());
                    // 保證這個檔案的父資料夾必須要存在
                    if (!targetFile.getParentFile().exists()) {
                        targetFile.getParentFile().mkdirs();
                    }
                    targetFile.createNewFile();
                    // 將壓縮檔案內容寫入到這個檔案中
                    InputStream is = zipFile.getInputStream(entry);
                    FileOutputStream fos = new FileOutputStream(targetFile);
                    int len;
                    byte[] buf = new byte[1024];
                    while ((len = is.read(buf)) != -1) {
                        fos.write(buf, 0, len);
                    }
                    // 關流順序，先開啟的後關閉
                    fos.close();
                    is.close();
                }
            }
            long end = System.currentTimeMillis();
            System.out.println("解壓完成，耗時：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("unzip error from ZipUtils", e);
        } finally {
            if (zipFile != null) {
                try {
                    zipFile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}