String toHexString(byte b);
String toHexString(byte[] bytes);String toStringFromBcd(byte[] bytes);byte[] xor(byte[] message, byte[] key);int bytes2Int(byte[] bytes);
byte[] int2Bytes(int i);
byte[] long2Bytes(long num);
long bytes2Long(byte[] byteNum);String binary2Oct(String source);
String binary2Dec(String source);
String binary2Hex(String source)
String oct2Binary(String source);
String oct2Dec(String source)
String oct2Hex(String source);
String dec2Binary(int source);
String dec2Oct(int source);
String dec2Hex(int source);
String hex2Binary(String source)；
String hex2Oct(String source);
String hex2Dec(String source)；
String toHexDigest(String str, String algorithm);toHexString(String str);String getCoding(String filePath);String getContent(File file);void deleteFiles(File file);
void deleteFiles(String filePath);String getExtension(File file);ArrayList<String> getSupportMediaType();ArrayList<String> getSupportExtension();ArrayList<String> getMediaTypeMatch(String type);ArrayList<String> getExtensionMatch(String extension);String getMediaType(File file);String getMediaTypeWithExtension(File file);boolean isSpecialType(File file, String type);public static String getFileSummary(File file, String algorithm);