首先是文件类型枚取
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package org.filetype; /** * 文件类型枚取 */ public enum FileType { /** * JEPG. */ JPEG("FFD8FF"), /** * PNG. */ PNG("89504E47"), /** * GIF. */ GIF("47494638"), /** * TIFF. */ TIFF("49492A00"), /** * Windows Bitmap. */ BMP("424D"), /** * CAD. */ DWG("41433130"), /** * Adobe Photoshop. */ PSD("38425053"), /** * Rich Text Format. */ RTF("7B5C727466"), /** * XML. */ XML("3C3F786D6C"), /** * HTML. */ HTML("68746D6C3E"), /** * Email [thorough only]. */ EML("44656C69766572792D646174653A"), /** * Outlook Express. */ DBX("CFAD12FEC5FD746F"), /** * Outlook (pst). */ PST("2142444E"), /** * MS Word/Excel. */ XLS_DOC("D0CF11E0"), /** * MS Access. */ MDB("5374616E64617264204A"), /** * WordPerfect. */ WPD("FF575043"), /** * Postscript. */ EPS("252150532D41646F6265"), /** * Adobe Acrobat. */ PDF("255044462D312E"), /** * Quicken. */ QDF("AC9EBD8F"), /** * Windows Password. */ PWL("E3828596"), /** * ZIP Archive. */ ZIP("504B0304"), /** * RAR Archive. */ RAR("52617221"), /** * Wave. */ WAV("57415645"), /** * AVI. */ AVI("41564920"), /** * Real Audio. */ RAM("2E7261FD"), /** * Real Media. */ RM("2E524D46"), /** * MPEG (mpg). */ MPG("000001BA"), /** * Quicktime. */ MOV("6D6F6F76"), /** * Windows Media. */ ASF("3026B2758E66CF11"), /** * MIDI. */ MID("4D546864"); private String value = ""; /** * Constructor. * * @param type */ private FileType(String value) { this.value = value; } public String getValue() { return value; } public void setValue(String value) { this.value = value; } } |
然后是类型判断核心类
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package org.filetype; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; /** * 文件类型判断类 */ public final class FileTypeJudge { /** * Constructor */ private FileTypeJudge() {} /** * 将文件头转换成16进制字符串 * * @param 原生byte * @return 16进制字符串 */ private 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(); } /** * 得到文件头 * * @param filePath 文件路径 * @return 文件头 * @throws IOException */ private static String getFileContent(String filePath) throws IOException { byte[] b = new byte[28]; InputStream inputStream = null; try { inputStream = new FileInputStream(filePath); inputStream.read(b, 0, 28); } catch (IOException e) { e.printStackTrace(); throw e; } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); throw e; } } } return bytesToHexString(b); } /** * 判断文件类型 * * @param filePath 文件路径 * @return 文件类型 */ public static FileType getType(String filePath) throws IOException { String fileHead = getFileContent(filePath); if (fileHead == null || fileHead.length() == 0) { return null; } fileHead = fileHead.toUpperCase(); FileType[] fileTypes = FileType.values(); for (FileType type : fileTypes) { if (fileHead.startsWith(type.getValue())) { return type; } } return null; } } |
最后是测试类
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package org.filetype; public class Test { /** * @param args */ public static void main(String args[]) throws Exception { System.out.println(FileTypeJudge.getType("C:\\eclipse-jee-helios-win32.zip")); } } |