The file type is determined using apache.tika

I. file type may generally be determined in two ways

　　1. extension judge

 　　　　Easy to operate, but can not accurately determine the type

　　2. Analyzing the file header information

　　　　Analyzing the file type can usually, but some can not determine the file type (e.g., the first few bytes of header information word and excel is the same, not determined)

　　3. Use apache.tika can easily solve the above problem in two ways

 

II. Use

　　1. maven dependence

<dependency>
    <groupId>org.apache.tika</groupId>
    <artifactId>tika-core</artifactId>
    <version>1.22</version>
</dependency>

　　2. realization

 1 public static String getMimeType(String fileName, InputStream inputStream){
 2     AutoDetectParser parser = new AutoDetectParser();
 3     parser.setParsers(new HashMap<MediaType, Parser>());
 4 
 5     Metadata metadata = new Metadata();
 6     metadata.add(TikaMetadataKeys.RESOURCE_NAME_KEY, fileName);
 7 
 8     try {
 9         parser.parse(inputStream, new DefaultHandler(), metadata, new ParseContext());
10         inputStream.close();
11     } catch (TikaException | SAXException | IOException e) {
12         e.printStackTrace();
13     }
14 
15     return metadata.get(HttpHeaders.CONTENT_TYPE);
16 }

　　3. common file types

MimeType	file type
application/msword	word(.doc)
application/vnd.ms-powerpoint	powerpoint(.ppt)
application/vnd.ms-excel	excel(.xls)
application/vnd.openxmlformats-officedocument.wordprocessingml.document	word(.docx)
application/vnd.openxmlformats-officedocument.presentationml.presentation	powerpoint(.pptx)
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet	excel(.xlsx)
application/x-rar-compressed	rar
application/zip	zip
application/pdf	pdf
video/*	Video files
image/*	Image files
text/plain	Plain Text
text/css	css file
text/html	html file
text/x-java-source	java source code
text/x-csrc	c source code
text/x-c++src	c ++ source code