判断java文件类型TikaToolKit的实例

<dependency>
  <groupId>org.apache.tika</groupId>
  <artifactId>tika-core</artifactId>
  <version>1.20</version>
</dependency>

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.apache.tika.metadata.HttpHeaders;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.TikaMetadataKeys;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.tika.parser.ParseContext;
import org.xml.sax.helpers.DefaultHandler;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/**
 * tika
 *
 * @author zhy
 */
@Slf4j
public class TikaToolUtil {
 
  /**
   * 获取类型
   *
   * @param file 文件
   * @return String
   */
  public static String getMimeType(File file) {
    if (file.isDirectory()) {
      return "the target is a directory";
    }
 
    AutoDetectParser parser = new AutoDetectParser();
    parser.setParsers(new HashMap<>());
    Metadata metadata = new Metadata();
    metadata.add(TikaMetadataKeys.RESOURCE_NAME_KEY, file.getName());
    try (InputStream stream = new FileInputStream(file)) {
      parser.parse(stream, new DefaultHandler(), metadata, new ParseContext());
    } catch (Exception e) {
      log.error(e.getMessage());
    }
    return metadata.get(HttpHeaders.CONTENT_TYPE);
  }
 
  /**
   * 判断是否是图片
   *
   * @param file 文件
   * @return boolean
   */
  public static boolean isImage(File file) {
    String type = getMimeType(file);
    System.out.println(type);
    Pattern p = Pattern.compile(Type.IMAGE.name);
    Matcher m = p.matcher(type);
    return m.matches();
  }
 
  /**
   * 判断是否是zip
   *
   * @param file 文件
   * @return boolean
   */
  public static boolean isZip(File file) {
    String type = getMimeType(file);
    System.out.println(type);
    Pattern p = Pattern.compile(Type.ZIP.name);
    Matcher m = p.matcher(type);
    return m.matches();
  }
 
  /**
   * 判断是否是dicom
   *
   * @param file 文件
   * @return boolean
   */
  public static boolean isDicom(File file) {
    String type = getMimeType(file);
    Pattern p = Pattern.compile(Type.DCM.name);
    Matcher m = p.matcher(type);
    return m.matches();
  }
 
  /**
   * 类型枚举
   */
  @Getter
  @AllArgsConstructor
  public enum Type {
    /**
     * dcm
     */
    DCM("application/dicom"),
    /**
     * zip
     */
    ZIP("application/zip"),
    /**
     * 图片
     */
    IMAGE("image/.*"),
    /**
     * 视频
     */
    VIDEO("video/*");
 
    private String name;
  }
 
  public static void main(String[] args) {
    boolean image = isImage(new File("C:\\Users\\zhy\\Desktop\\dcm\\123.dcm"));
    System.out.println("zhy:" + image);
  }
}

import java.io.FileInputStream;

public class FileType{
  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();
  }

  /**
   * @param args
   */
  public static void main(String[] args) throws Exception {
    FileInputStream is = new FileInputStream("F:\\相册\\微信图片\\03.jpg");
    byte[] b = new byte[3];
    is.read(b, 0, b.length);
    String xxx = bytesToHexString(b);
    xxx = xxx.toUpperCase();
    System.out.println("头文件是：" + xxx);
    String ooo = TypeDict.checkType(xxx);
    System.out.println("后缀名是：" + ooo);

  }  
}

public class TypeDict {
/**
 常用文件的文件头如下：(以前六位为准)
JPEG (jpg)，文件头：FFD8FF 
PNG (png)，文件头：89504E47 
GIF (gif)，文件头：47494638 
TIFF (tif)，文件头：49492A00 
Windows 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 [thorough only] (eml)，文件头：44656C69766572792D646174653A 
Outlook Express (dbx)，文件头：CFAD12FEC5FD746F 
Outlook (pst)，文件头：2142444E 
MS 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：AC9EBD8F 
Windows Password (pwl)，文件头：E3828596 
ZIP Archive (zip)，文件头：504B0304 
RAR Archive (rar)，文件头：52617221 
Wave (wav)，文件头：57415645 
AVI (avi)，文件头：41564920 
Real Audio (ram)，文件头：2E7261FD 
Real Media (rm)，文件头：2E524D46 
MPEG (mpg)，文件头：000001BA 
MPEG (mpg)，文件头：000001B3 
Quicktime (mov)，文件头：6D6F6F76 
Windows Media (asf)，文件头：3026B2758E66CF11 
MIDI (mid)，文件头：4D546864 
*/
  public static String checkType(String xxxx) {
    
    switch (xxxx) {
    case "FFD8FF": return "jpg";
    case "89504E": return "png";
    case "474946": return "jif";

    default: return "0000";
    }
  }
}