Java中有可以直接解壓gzip檔案的輸入流。

/**
     * 獲取檔名（去掉.gz字尾）
     * @param path
     * @return
     */
    public static String getPrefix(String path) {
        int index = path.lastIndexOf('.');
        return path.substring(0, index);
    }

    public static void unGzip(String srcPath) {
        unGzip(new
 
 File(srcPath));

    }

    /**
     * 解壓Gzip
     * @param src 壓縮檔案
     */
    public static void unGzip(File src) {

        String path = getPrefix(src.getAbsolutePath());
        GZIPInputStream gzs = null;
        BufferedOutputStream bos = null;
        try {
            gzs = new GZIPInputStream(new
 
 FileInputStream(src));
            bos = new BufferedOutputStream(new FileOutputStream(path));

            byte[] buf = new byte[102400];
            int len = -1;
            while ((len = gzs.read(buf)) != -1) {
                bos.write(buf, 0, len);
            }
            bos.flush();
        } catch
 
 (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            FileUtil.close(gzs, bos);
        }

    }

    /**
     * 關閉流
     * @param io
     */
    public static void close(Closeable ...io){
        for (Closeable temp : io) {
            try {
                if(temp != null){
                    temp.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }