Java文件类型校验之Apache Tika详解

<dependency>
    <groupId>org.apache.tika</groupId>
    <artifactId>tika-core</artifactId>
    <version>1.24.1</version>
</dependency>

使用示例
String fileName = multipartFile.getOriginalFilename();
FileTypeCheck.getFileTypeByFileName(fileName,multipartFile);

@Slf4j
public class FileTypeCheck {

    public static void getFileTypeByFileName(final String fileName, MultipartFile mFile) {
        Tika defaultTika = new Tika();
        String fileType;
        final File file = new File(fileName);
        try {
            FileUtils.copyInputStreamToFile(mFile.getInputStream(), file);
            fileType = defaultTika.detect(file);
            if (!FileTypeContant.FILE_TYPE_XLS.equals(fileType) && !FileTypeContant.FILE_TYPE_XLSX.equals(fileType)
                    && !FileTypeContant.FILE_TYPE_DOC.equals(fileType) && !FileTypeContant.FILE_TYPE_DOCX.equals(fileType) && !FileTypeContant.FILE_TYPE_PDF.equals(fileType)
                    && !FileTypeContant.FILE_TYPE_JSON.equals(fileType) && !FileTypeContant.FILE_TYPE_XML.equals(fileType)
                    && !FileTypeContant.FILE_TYPE_SVG.equals(fileType) && !FileTypeContant.FILE_TYPE_PNG.equals(fileType)) {
                throw new ZTBusinessException("请上传正确的文件类型!!!");
            }
        } catch (IOException e) {
            log.error("getFileTypeByFileName exception:", e);
        } finally {
            if (file.exists()) {
                file.delete();
            }
        }
    }

}

public class FileTypeContant {

    public static final String FILE_TYPE_XLS = "application/vnd.ms-excel";
    public static final String FILE_TYPE_XLSX = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    public static final String FILE_TYPE_DOC = "application/msword";
    public static final String FILE_TYPE_DOCX = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
    public static final String FILE_TYPE_PDF = "application/pdf";
    public static final String FILE_TYPE_JSON = "application/json";
    public static final String FILE_TYPE_XML = "application/xml";
    public static final String FILE_TYPE_PNG = "image/png";
    public static final String FILE_TYPE_SVG = "image/svg";

}

//MultipartFile转File
File file = new File(path); 
FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), file);  
 
/*其中File可以
  File file = new File(mFile.getOriginalFilename());
  这是保存在了工程路径下，用完要删除
  file.delete();
*/
 
 
//File转MultipartFile
File file = new File("src/test/resources/input.txt");
FileInputStream input = new FileInputStream(file);
MultipartFile multipartFile =new MockMultipartFile("file", file.getName(), "text/plain", IOUtils.toByteArray(input));