Identifying file type in Java

Question

Please help me to find out the type of the file which is being uploaded. I wanted to distinguish between excel type and csv.

MIMEType returns same for both of thes

Answer 1

If you are already using Spring this works for csv and excel:

import org.springframework.mail.javamail.ConfigurableMimeFileTypeMap;

import javax.activation.FileTypeMap;
import java.io.IOException;

public class ContentTypeResolver {

    private FileTypeMap fileTypeMap;

    public ContentTypeResolver() {
        fileTypeMap = new ConfigurableMimeFileTypeMap();
    }

    public String getContentType(String fileName) throws IOException {
        if (fileName == null) {
            return null;
        }
        return fileTypeMap.getContentType(fileName.toLowerCase());
    }

}

or with javax.activation you can update the mime.types file.