Java获取Base64图片文件格式

大家好！

一、获取Base64图片文件格式

代码如下：

/**
     * 判断图片base64字符串的文件格式
     * @param base64
     * @return
     */
    public static String getBase64Type(String base64) {
        byte[] b = Base64.getDecoder().decode(base64);
        String type = "";
        if (0x424D == ((b[0] & 0xff) << 8 | (b[1] & 0xff))) {
            type = "bmp";
        } else if (0x8950 == ((b[0] & 0xff) << 8 | (b[1] & 0xff))) {
            type = "png";
        } else if (0xFFD8 == ((b[0] & 0xff) << 8 | (b[1] & 0xff))) {
            type = "jpg";
        } else if (0x49492A00 == ((b[0] & 0xff) << 24 | (b[1] & 0xff) << 16 | (b[2] & 0xff) << 8 | (b[3] & 0xff))) {
            type = "tif";
        }
        return type;
    }

只需将base64字符串传入即可，此处我只对以上类型进行了判断，欢迎补充~