java文件头_java根据文件头判断文件类型

1 packagecom.mytest;2

3 importjava.io.FileInputStream;4 importjava.io.FileNotFoundException;5 importjava.io.IOException;6 importjava.util.HashMap;7 importjava.util.Iterator;8 importjava.util.Map;9

10 public classVerifyFileType {11

12 public final static Map FILE_TYPE_MAP = new HashMap();13 private staticFileInputStream is;14 static{15 getAllFileType(); //初始化文件类型信息

16 }17 /**

18 * 常用文件格式19 */

20 private static voidgetAllFileType() {21 FILE_TYPE_MAP.put("ffd8ffe000104a464946", "jpg"); //JPEG (jpg)

22 FILE_TYPE_MAP.put("89504e470d0a1a0a0000", "png"); //PNG (png)

23 FILE_TYPE_MAP.put("47494638396126026f01", "gif"); //GIF (gif)

24 FILE_TYPE_MAP.put("49492a00227105008037", "tif"); //TIFF (tif)

25 FILE_TYPE_MAP.put("424d228c010000000000", "bmp"); //16色位图(bmp)

26 FILE_TYPE_MAP.put("424d8240090000000000", "bmp"); //24位位图(bmp)

27 FILE_TYPE_MAP.put("424d8e1b030000000000", "bmp"); //256色位图(bmp)

28 FILE_TYPE_MAP.put("41433130313500000000", "dwg"); //CAD (dwg)

29 FILE_TYPE_MAP.put("3c21444f435459504520", "html"); //HTML (html)

30 FILE_TYPE_MAP.put("3c21646f637479706520", "htm"); //HTM (htm)

31 FILE_TYPE_MAP.put("48544d4c207b0d0a0942", "css"); //css

32 FILE_TYPE_MAP.put("696b2e71623d696b2e71", "js"); //js

33 FILE_TYPE_MAP.put("7b5c727466315c616e73", "rtf"); //Rich Text Format (rtf)

34 FILE_TYPE_MAP.put("38425053000100000000", "psd"); //Photoshop (psd)

35 FILE_TYPE_MAP.put("46726f6d3a203d3f6762", "eml"); //Email [Outlook Express 6] (eml)

36 FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "doc"); //MS Excel 注意：word、msi 和 excel的文件头一样

37 FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "vsd"); //Visio 绘图

38 FILE_TYPE_MAP.put("5374616E64617264204A", "mdb"); //MS Access (mdb)

39 FILE_TYPE_MAP.put("252150532D41646F6265", "ps");40 FILE_TYPE_MAP.put("255044462d312e350d0a", "pdf"); //Adobe Acrobat (pdf)

41 FILE_TYPE_MAP.put("2e524d46000000120001", "rmvb"); //rmvb/rm相同

42 FILE_TYPE_MAP.put("464c5601050000000900", "flv"); //flv与f4v相同

43 FILE_TYPE_MAP.put("00000020667479706d70", "mp4");44 FILE_TYPE_MAP.put("49443303000000002176", "mp3");45 FILE_TYPE_MAP.put("000001ba210001000180", "mpg"); //46 FILE_TYPE_MAP.put("3026b2758e66cf11a6d9", "wmv"); //wmv与asf相同

47 FILE_TYPE_MAP.put("52494646e27807005741", "wav"); //Wave (wav)

48 FILE_TYPE_MAP.put("52494646d07d60074156", "avi");49 FILE_TYPE_MAP.put("4d546864000000060001", "mid"); //MIDI (mid)

50 FILE_TYPE_MAP.put("504b0304140000000800", "zip");51 FILE_TYPE_MAP.put("526172211a0700cf9073", "rar");52 FILE_TYPE_MAP.put("235468697320636f6e66", "ini");53 FILE_TYPE_MAP.put("504b03040a0000000000", "jar");54 FILE_TYPE_MAP.put("4d5a9000030000000400", "exe");//可执行文件

55 FILE_TYPE_MAP.put("3c25402070616765206c", "jsp");//jsp文件

56 FILE_TYPE_MAP.put("4d616e69666573742d56", "mf");//MF文件

57 FILE_TYPE_MAP.put("3c3f786d6c2076657273", "xml");//xml文件

58 FILE_TYPE_MAP.put("494e5345525420494e54", "sql");//xml文件

59 FILE_TYPE_MAP.put("7061636b616765207765", "java");//java文件

60 FILE_TYPE_MAP.put("406563686f206f66660d", "bat");//bat文件

61 FILE_TYPE_MAP.put("1f8b0800000000000000", "gz");//gz文件

62 FILE_TYPE_MAP.put("6c6f67346a2e726f6f74", "properties");//bat文件

63 FILE_TYPE_MAP.put("cafebabe0000002e0041", "class");//bat文件

64 FILE_TYPE_MAP.put("49545346030000006000", "chm");//bat文件

65 FILE_TYPE_MAP.put("04000000010000001300", "mxp");//bat文件

66 FILE_TYPE_MAP.put("504b0304140006000800", "docx");//docx文件

67 FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "wps");//WPS文字wps、表格et、演示dps都是一样的

68 FILE_TYPE_MAP.put("6431303a637265617465", "torrent");69

70 FILE_TYPE_MAP.put("6D6F6F76", "mov"); //Quicktime (mov)

71 FILE_TYPE_MAP.put("FF575043", "wpd"); //WordPerfect (wpd)

72 FILE_TYPE_MAP.put("CFAD12FEC5FD746F", "dbx"); //Outlook Express (dbx)

73 FILE_TYPE_MAP.put("2142444E", "pst"); //Outlook (pst)

74 FILE_TYPE_MAP.put("AC9EBD8F", "qdf"); //Quicken (qdf)

75 FILE_TYPE_MAP.put("E3828596", "pwl"); //Windows Password (pwl)

76 FILE_TYPE_MAP.put("2E7261FD", "ram"); //Real Audio (ram)

77 FILE_TYPE_MAP.put("null", null); //null

78 }79

80 /**

81 * 得到上传文件的文件头82 *83 *@paramsrc84 *@return

85 */

86 public static String bytesToHexString(byte[] src) {87 StringBuilder stringBuilder = newStringBuilder();88 if (src == null || src.length <= 0) {89 return null;90 }91 for (int i = 0; i < src.length; i++) {92 int v = src[i] & 0xFF;93 String hv =Integer.toHexString(v);94 if (hv.length() < 2) {95 stringBuilder.append(0);96 }97 stringBuilder.append(hv);98 }99 returnstringBuilder.toString();100 }101 /**

102 * 根据制定文件的文件头判断其文件类型103 *104 *@paramfilePaht105 *@return

106 */

107 public staticString getFileType(String filePaht) {108 String res = null;109 try{110 is = newFileInputStream(filePaht);111 byte[] b = new byte[10];112 is.read(b, 0, b.length);113 String fileCode =bytesToHexString(b);114

115 Iterator keyIter =FILE_TYPE_MAP.keySet().iterator();116 while(keyIter.hasNext()) {117 String key =keyIter.next();118 //验证前5个字符比较

119 if (key.toLowerCase().startsWith(fileCode.toLowerCase().substring(0, 5))120 || fileCode.toLowerCase().substring(0, 5).startsWith(key.toLowerCase())) {121 res =FILE_TYPE_MAP.get(key);122 break;123 }124 }125 } catch(FileNotFoundException e) {126 e.printStackTrace();127 } catch(IOException e) {128 e.printStackTrace();129 }130 returnres;131 }132

133 public static void main(String[] args) throwsException {134 String type = getFileType("E:\\20170615163016.png");135 System.out.println("Except : " +type);136 System.out.println();137 }138 }