Determine file type based on file header data

package com.campus.utils;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class FileType {

	public final static Map<String, String> FILE_TYPE_MAP = new HashMap<String, String>();

	private FileType() {
	}

	static {
		getAllFileType(); // Initialize file type information
	}

	/**   
     * Discription: [getAllFileType, common file header information]
     */     
    private static void getAllFileType(){     
        FILE_TYPE_MAP.put("ffd8ffe000104a464946", "jpg"); //JPEG (jpg)     
        FILE_TYPE_MAP.put("89504e470d0a1a0a0000", "png"); //PNG (png)     
        FILE_TYPE_MAP.put("47494638396126026f01", "gif"); //GIF (gif)     
        FILE_TYPE_MAP.put("49492a00227105008037", "tif"); //TIFF (tif)     
        FILE_TYPE_MAP.put("424d228c010000000000", "bmp"); //16色位图(bmp)     
        FILE_TYPE_MAP.put("424d8240090000000000", "bmp"); //24位位图(bmp)     
        FILE_TYPE_MAP.put("424d8e1b030000000000", "bmp"); //256色位图(bmp)     
        FILE_TYPE_MAP.put("41433130313500000000", "dwg"); //CAD (dwg)     
        FILE_TYPE_MAP.put("3c21444f435459504520", "html"); //HTML (html)
        FILE_TYPE_MAP.put("3c21646f637479706520", "htm"); //HTM (htm)
        FILE_TYPE_MAP.put("48544d4c207b0d0a0942", "css"); //css
        FILE_TYPE_MAP.put("696b2e71623d696b2e71", "js"); //js
        FILE_TYPE_MAP.put("7b5c727466315c616e73", "rtf"); //Rich Text Format (rtf)     
        FILE_TYPE_MAP.put("38425053000100000000", "psd"); //Photoshop (psd)     
        FILE_TYPE_MAP.put("46726f6d3a203d3f6762", "eml"); //Email [Outlook Express 6] (eml)       
        FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "doc"); //MS Excel Note: The file headers of word, msi and excel are the same     
        FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "vsd"); //Visio 绘图     
        FILE_TYPE_MAP.put("5374616E64617264204A", "mdb"); //MS Access (mdb)      
        FILE_TYPE_MAP.put("252150532D41646F6265", "ps");     
        FILE_TYPE_MAP.put("255044462d312e350d0a", "pdf"); //Adobe Acrobat (pdf)   
        FILE_TYPE_MAP.put("2e524d46000000120001", "rmvb"); //rmvb/rm相同  
        FILE_TYPE_MAP.put("464c5601050000000900", "flv"); //flv is the same as f4v  
        FILE_TYPE_MAP.put("00000020667479706d70", "mp4");
        FILE_TYPE_MAP.put("49443303000000002176", "mp3");
        FILE_TYPE_MAP.put("000001ba210001000180", "mpg"); //     
        FILE_TYPE_MAP.put("3026b2758e66cf11a6d9", "wmv"); //wmv is the same as asf    
        FILE_TYPE_MAP.put("52494646e27807005741", "wav"); //Wave (wav)  
        FILE_TYPE_MAP.put("52494646d07d60074156", "avi");  
        FILE_TYPE_MAP.put("4d546864000000060001", "mid"); //MIDI (mid)   
        FILE_TYPE_MAP.put("504b0304140000000800", "zip");    
        FILE_TYPE_MAP.put("526172211a0700cf9073", "rar");   
        FILE_TYPE_MAP.put("235468697320636f6e66", "ini");   
        FILE_TYPE_MAP.put("504b03040a0000000000", "jar");
        FILE_TYPE_MAP.put("4d5a9000030000000400", "exe");//Executable file
        FILE_TYPE_MAP.put("3c25402070616765206c", "jsp");//jsp文件
        FILE_TYPE_MAP.put("4d616e69666573742d56", "mf");//MF文件
        FILE_TYPE_MAP.put("3c3f786d6c2076657273", "xml");//xml文件
        FILE_TYPE_MAP.put("494e5345525420494e54", "sql");//xml文件
        FILE_TYPE_MAP.put("7061636b616765207765", "java");//java文件
        FILE_TYPE_MAP.put("406563686f206f66660d", "bat");//bat文件
        FILE_TYPE_MAP.put("1f8b0800000000000000", "gz");//gz文件
        FILE_TYPE_MAP.put("6c6f67346a2e726f6f74", "properties");//bat文件
        FILE_TYPE_MAP.put("cafebabe0000002e0041", "class");//bat文件
        FILE_TYPE_MAP.put("49545346030000006000", "chm");//bat文件
        FILE_TYPE_MAP.put("04000000010000001300", "mxp");//bat文件
        FILE_TYPE_MAP.put("504b0304140006000800", "docx");//docx文件
        FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "wps");//WPS text wps, table et, demo dps are all the same
        FILE_TYPE_MAP.put("6431303a637265617465", "torrent");
        
          
        FILE_TYPE_MAP.put("6D6F6F76", "mov"); //Quicktime (mov)  
        FILE_TYPE_MAP.put("FF575043", "wpd"); //WordPerfect (wpd)   
        FILE_TYPE_MAP.put("CFAD12FEC5FD746F", "dbx"); //Outlook Express (dbx)     
        FILE_TYPE_MAP.put("2142444E", "pst"); //Outlook (pst)      
        FILE_TYPE_MAP.put("AC9EBD8F", "qdf"); //Quicken (qdf)     
        FILE_TYPE_MAP.put("E3828596", "pwl"); //Windows Password (pwl)         
        FILE_TYPE_MAP.put("2E7261FD", "ram"); //Real Audio (ram)     
    }
    
    /**
     * Get the file header of the uploaded file
     * @param src
     * @return
     */
    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[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }
    
    /**
     * Determine the file type according to the file header of the developed file
     * @param filePaht
     * @return
     */
    public static String getFileType(String filePaht){
        String res = null;
        try {
            FileInputStream is = new FileInputStream(filePaht);
            byte[] b = new byte[10];
            is.read(b, 0, b.length);
            is.close();
            String fileCode = bytesToHexString(b);    
            
            System.out.println(fileCode);
            
            
            Iterator<String> keyIter = FILE_TYPE_MAP.keySet().iterator();
            while(keyIter.hasNext()){
                String key = keyIter.next();
                if(key.toLowerCase().startsWith(fileCode.toLowerCase()) || fileCode.toLowerCase().startsWith(key.toLowerCase())){
                    res = FILE_TYPE_MAP.get(key);
                    break;
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace ();
        } catch (IOException e) {
            e.printStackTrace ();
        }
        return res;
    }
    
    
    
    public static void main(String[] args) {
    	String fileType = FileType.getFileType("D:/test/test1.mp4");
    	
    	System.out.println(fileType);
	}
}

 

 

Source: http://www.cnblogs.com/mq0036/p/3912355.html