Java通过文件头获取文件类型

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public class FileCheckTypeUtil {    private static Logger logger = LogManager.getLogger(FileCheckTypeUtil.class);    static Map<String,String> map = null;    static {        map =new HashMap<>();        map.put("FFD8FF","jpg");        map.put("89504E","png");        map.put("474946","gif");        map.put("524946","webp");        map.put("000001","ico");        map.put("424D36","bmp");        map.put("00000A","tga");        map.put("49492A","tif");    }    private  static String bytesToHexString(byte[] src) {        StringBuilder stringBuilder = new StringBuilder();        if (src == null || src.length <= 0) {            return null;        }        for (int i = 0; i < src.length; i++) {            int v = src[i] & 0xFF;            String hv = Integer.toHexString(v);            if (hv.length() < 2) {                stringBuilder.append(0);            }            stringBuilder.append(hv);        }        return stringBuilder.toString();    }    private  static  String checkType(String code){        return map.get(code);    }    /**     * 获得图片后缀     * @param path     * @return     */    public static String getType(String path){        String type ="";        FileInputStream fileInputStream =null;        try {            fileInputStream = new FileInputStream(path);            byte[] b = new byte[3];            fileInputStream.read(b, 0, b.length);            String code = bytesToHexString(b);            code = code.toUpperCase();            type = checkType(code);        }catch (Exception e){            logger.error("获取文件格式异常");        }finally {            if(fileInputStream!=null){                try {                    fileInputStream.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }        return type;    }    public static void main(String[] args) throws IOException {        String path = "E:\\redis64-2.8.9.zip";        System.out.println(getType(path));    }}

文件类型需要提前穷举

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