java判断文件头信息区分文件类型 博客分类： javaIO javajavaio

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.Arrays;


/**
 * 
 * 文件类型校验 Spring3及以上 依赖Spring-core.jar和commons-io-xx.jar
 *
 */
public class FileValidateType {
	/**
	 * 文件头信息，十六进制信息，取前4位 
	 * 50 4b 03 04 office 2007+ 
	 * d0 cf 11 e0 office 97-03 
	 * 25 50 44 46 pdf
	 * ff d8 ff e0 jpg,部分png与jpg文件前4为一样 
	 * ff d8 ff e1 jpg,一种不同的jpg头文件	 www.2cto.con 
	 * 89 50 4e 47 png 
	 * 47 49 46 38 gif 
	 * 49 49 2A 00 tif 
	 * 42 4D bmp 
	 * 38 42 50 53 psd 
	 * 41 43 31 30 dwg 
	 * 252150532d41646f6265 ps 
	 * 0D0A0D0A txt
	 * 0D0A2D2D txt 
	 * 0D0AB4B4 txt 
	 * B4B4BDA8 txt,文件头部为汉字 
	 * 73646673 txt,文件头部为英文字母
	 * 32323232 txt,文件头部内容为数字 
	 * 0D0A09B4 txt,文件头部内容为数字 
	 * 3132330D txt,文件头部内容为数字
	 * 7B5C727466 rtf 日记本
	 * 
	 * //视频或音频类 
	 * 3026B275 wma 
	 * 57415645 wav 
	 * 41564920 avi 
	 * 4D546864 mid 
	 * 2E524D46 rm
	 * 000001BA mpg 
	 * 000001B3 mpg 
	 * 6D6F6F76 mov 
	 * 3026B2758E66CF11 asf
	 * 
	 * 压缩包 
	 * 52617221 rar 
	 * 1F8B08 gz
	 * 
	 * 程序文件 
	 * 3C3F786D6C xml 
	 * 68746D6C3E html 
	 * 7061636B java 
	 * 3C254020 jsp 
	 * 4D5A9000 exe
	 * 
	 * 
	 * 44656C69766572792D646174653A eml 
	 *  邮件 5374616E64617264204A mdb
	 * //Access数据库文件
	 * 
	 * 46726F6D mht 4D494D45 mhtml
	 */

	public static final String FILE_TYPE_OFFICE_97_03 = "d0cf11e0";
	public static final String FILE_TYPE_OFFICE_07 = "504b0304";
	public static final String FILE_TYPE_OFFICE_PDF = "25504446";
	public static final String FILE_TYPE_OFFICE_JPG1 = "ffd8ffe0";
	public static final String FILE_TYPE_OFFICE_JPG2 = "ffd8ffe1";

	public static boolean validataType(byte[] bt, String[] costomTypes) {
		String Types = Arrays.toString(costomTypes).substring(1,
				Arrays.toString(costomTypes).length() - 1);
		Types = Types.replaceAll(", ", " ");
		if (bt != null) {
			int size = bt.length;
			String hex = null;
			StringBuilder contentType = new StringBuilder();
			for (int i = 0; i < size; i++) {
				hex = Integer.toHexString(bt[i] & 0xFF);
				if (hex.length() == 1)
					hex = "0" + hex;
				contentType.append(hex);
				if (i > 2)
					break;
				if (Types.indexOf(contentType.toString()) > -1)
					return Boolean.TRUE;
			}
		}
		return Boolean.FALSE;
	}

	/*
	 * private static boolean validateType(String path,String[] costomTypes){
	 * boolean flag=false; try { flag =
	 * FileValidateType.validataType(FileUtils.readFileToByteArray
	 * (ResourceUtils.getFile("classpath:"+path)), costomTypes); } catch
	 * (IOException e) { e.printStackTrace(); } return flag; }
	 */
	/**
	 * 从输入流获取数据
	 * 
	 * @param inputStream
	 * @return
	 * @throws Exception
	 */
	public static byte[] readInputStream(InputStream inputStream)
			throws Exception {
		byte[] buffer = new byte[1024];
		int len = -1;
		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
		while ((len = inputStream.read(buffer)) != -1) {
			outputStream.write(buffer, 0, len);
		}
		outputStream.close();
		return outputStream.toByteArray();
	}
}