获取文件MD5值

• 记录一下获取文件md5值的方法

    /**
    * 获取文件MD5值
    * @param FilePath
    * @return
    */
    static String GetMd5(String FilePath) {
        char hexdigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        FileInputStream fis = null;
        String sString;
        char str[] = new char[16 * 2];
        int k = 0;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            fis = new FileInputStream(FilePath);
            byte[] buffer = new byte[1024];
            int length = -1;
            while ((length = fis.read(buffer)) != -1) {
                md.update(buffer, 0, length);
            }
            byte[] b = md.digest();
            for (int i = 0; i < 16; i++) {
                byte byte0 = b[i];
                str[k++] = hexdigits[byte0 >>> 4 & 0xf];
                str[k++] = hexdigits[byte0 & 0xf];
            }
            fis.close();
            sString = new String(str);
            return sString;
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        } finally {
            try {
                if (fis != null) {
                    fis.close();
                    fis = null;
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }
}