[转]用java流方式判断文件类型
文章分类:Java编程 今天在群里面看有人贴的一个帖子,觉得挺不错的,转过来。 来源:http://topic.csdn.net/u/20100430/11/1e14634d-0045-47f8-9e1b-f8fd52ba1597.html?seed=881844262&r=65101569#r_65101569 用文件头判断。直接读取文件的前几个字节。 常用文件的文件头如下: JPEG (jpg),文件头:FFD8FF PNG (png),文件头:89504E47 GIF (gif),文件头:47494638 TIFF (tif),文件头:49492A00Windows 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 (eml),文件头:44656C69766572792D646174653A Outlook Express (dbx),文件头:CFAD12FEC5FD746FOutlook (pst),文件头:2142444EMS 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:AC9EBD8FWindows Password (pwl),文件头:E3828596ZIP Archive (zip),文件头:504B0304RAR Archive (rar),文件头:52617221Wave (wav),文件头:57415645AVI (avi),文件头:41564920Real Audio (ram),文件头:2E7261FDReal Media (rm),文件头:2E524D46MPEG (mpg),文件头:000001BAMPEG (mpg),文件头:000001B3 Quicktime (mov),文件头:6D6F6F76Windows Media (asf),文件头:3026B2758E66CF11MIDI (mid),文件头:4D546864 测试代码 package org.test;import java.io.FileInputStream;public class Test { public 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 & 0xFF; String hv = Integer.toHexString(v); if (hv.length() < 2) { stringBuilder.append(0); } stringBuilder.append(hv); } return stringBuilder.toString(); } /** * @param args */ public static void main(String[] args) throws Exception { FileInputStream is = new FileInputStream("D:\\face.jpg"); byte[] b = new byte; is.read(b, 0, b.length); System.out.println(bytesToHexString(b)); }}
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