摘要:importjava.io.FileInputStream;publicclassFileType{publicstaticStringbytesToHexString(byte[]src){StringBuilderstringBuilder=newStringBuilder();if(src==null||src.length˂=0){returnnull;}for(inti=0;i˂src.
importjava.io.FileInputStream;
public classFileType{
public static String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = newStringBuilder();
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);
}
returnstringBuilder.toString();
}
/*** @paramargs
*/
public static void main(String[] args) throwsException {
FileInputStream is = new FileInputStream("F:\相册\微信图片\03.jpg");
byte[] b = new byte[3];
is.read(b, 0, b.length);
String xxx =bytesToHexString(b);
xxx =xxx.toUpperCase();
System.out.println("头文件是:" +xxx);
String ooo =TypeDict.checkType(xxx);
System.out.println("后缀名是:" +ooo);
}
}
public classTypeDict {
/**常用文件的文件头如下:(以前六位为准)
JPEG (jpg),文件头:FFD8FF
PNG (png),文件头:89504E47
GIF (gif),文件头:47494638
TIFF (tif),文件头:49492A00
Windows Bitmap (bmp),文件头:424D
CAD (dwg),文件头:41433130
Adobe Photoshop (psd),文件头:38425053
Rich Text Format (rtf),文件头:7B5C727466
XML (xml),文件头:3C3F786D6C
HTML (html),文件头:68746D6C3E
Email [thorough only] (eml),文件头:44656C69766572792D646174653A
Outlook Express (dbx),文件头:CFAD12FEC5FD746F
Outlook (pst),文件头:2142444E
MS Word/Excel (xls.or.doc),文件头:D0CF11E0
MS Access (mdb),文件头:5374616E64617264204A
WordPerfect (wpd),文件头:FF575043
Postscript (eps.or.ps),文件头:252150532D41646F6265
Adobe Acrobat (pdf),文件头:255044462D312E
Quicken (qdf),文件头:AC9EBD8F
Windows Password (pwl),文件头:E3828596
ZIP Archive (zip),文件头:504B0304
RAR Archive (rar),文件头:52617221
Wave (wav),文件头:57415645
AVI (avi),文件头:41564920
Real Audio (ram),文件头:2E7261FD
Real Media (rm),文件头:2E524D46
MPEG (mpg),文件头:000001BA
MPEG (mpg),文件头:000001B3
Quicktime (mov),文件头:6D6F6F76
Windows Media (asf),文件头:3026B2758E66CF11
MIDI (mid),文件头:4D546864
*/
public staticString checkType(String xxxx) {
switch(xxxx) {
case "FFD8FF": return "jpg";
case "89504E": return "png";
case "474946": return "jif";
default: return "0000";
}
}
}