Flask接口签名sign原理与实例代码浅析
442
2022-11-17
判断java文件类型TikaToolKit的实例
引入依赖
或
compile 'org.apache.tika:tika-core:1.20'
工具类
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 Filehttp://("C:\\Users\\zhy\\Desktop\\dcm\\123.dcm"));
System.out.println("zhy:" + image);
}
}
补充知识:java根据文件流判断文件类型(后缀名)
我就废话不多说了,大家还是直接看代码吧~
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";
}
}
}
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