To determine the file type in Java streaming mode

This method can only be effective within a limited range. It's not balm.

Like what

The image type judgment, the audio file format judgment, the video file format judgment and so on this affirmation is 2 binary and the professional very strong file type judgment.

The full version of the code is given below

The first is the file type fetch

Package org.filetype;/** * File type fetch */public enum filetype {/** * jepg. */jpeg ("ffd8ff"),/** * PNG. */png ("89504E47"),/** * Gif. */gif ("47494638"),/** * TIFF. */tiff ("49492a00"),/** * Windows Bitmap. */bmp ("424D"),/** * CAD. */DWG ("41433130"),/** * Adobe Photoshop. */PSD ("38425053"),/** * Rich Text Format. */rtf ("7b5c727466"),/** * XML. */xml ("3c3f786d6c"),/** * HTML. */html ("68746d6c3e"),/** * Email [thorough only]. */EML ("44656c69766572792d646174653a"),/** * Outlook Express. */dbx ("cfad12fec5fd746f"),/** * Outlook (PST). */pst ("2142444E"),/** * MS word/excel. */xls_doc ("D0cf11e0"),/** * MS Access. */mdb ("5374616e64617264204a"),/** * WordPerfect. */WPD ("FF575043"),/** * Postscript. */eps ("252150532d41646f6265"),/** * Adobe Acrobat. */pdf ("255044462d312e"),/** * Quicken. */QDF ("ac9ebd8f"),/** * Windows Password. */PWL ("E3828596"),/** * ZIP Archive. */zip ("504b0304"),/** * RAR Archive. */rar ("52617221"),/** * Wave. */wav ("57415645"),/** * AVI. */avi ("41564920"),/** * Real Audio. */ram ("2E7261FD "),/** * Real Media. */RM ("2e524d46"),/** * MPEG (MPG). */mpg ("000001BA"),/** * Quicktime. */mov ("6d6f6f76"),/** * Windows Media. */ASF ("3026b2758e66cf11"),/** * MIDI. */mid ("4d546864");p rivate String value = "";/** * Constructor. * * @param type */private FileType (String value) {this.value = value;} Public String GetValue () {return value;} public void SetValue (String value) {this.value = value;}}

Then the type judgment core class

Package Org.filetype;import Java.io.fileinputstream;import Java.io.ioexception;import java.io.InputStream;/** *  File type Judgment Class */public final class Filetypejudge {/** * Constructor */private Filetypejudge () {}/** * convert header to 16 binary string * * @param Native byte * @return 16 binary string */private static string bytestohexstring (byte[] src) {StringBuilder StringBuilder = new S           Tringbuilder ();           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 (); }/** * Get file Header * * @param filePath file path * @return file header * @throws ioexception */private static String getfilecontent (Strin G FilePath) throws IOException {byte[] b = new Byte[28];inputstream inputStream = null;try {inputstream = new FileInputStream (FilePath); Inputstream.read (b, 0,);} catch (IOException e) {E.print StackTrace (); throw e;} finally {if (InputStream! = null) {try {inputstream.close ()} catch (IOException e) {e.printstacktrace (); throw e;}}} return bytestohexstring (b);}  /** * Determine file type * * @param filePath file path * @return file type */public static FileType getType (String filePath) throws IOException {String Filehead = getfilecontent (FilePath), if (Filehead = = NULL | | filehead.length () = = 0) {return null;} Filehead = Filehead.touppercase (); filetype[] FileTypes = Filetype.values (); for (FileType type:filetypes) {if (Filehead.startswith (Type.getvalue ())) { return type;}} return null;}}

Finally, the test class

Package Org.filetype;public class Test {/** * @param args */public static void Main (String args[]) throws Exception {Syste M.out.println (Filetypejudge.gettype ("C:\\eclipse-jee-helios-win32.zip"));}}

　　

To determine the file type in Java streaming mode