Java: Read Exif Metadata Using Sanselan

Recently I have been investigating image library in Java.
In this post, I will show you the code snippet for extracting jpeg image exif metadata using Sanselan.

Code

package com.dulesoftware.image;

import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.sanselan.ImageReadException;
import org.apache.sanselan.Sanselan;
import org.apache.sanselan.common.IImageMetadata;
import org.apache.sanselan.common.ImageMetadata.Item;
import org.apache.sanselan.formats.jpeg.JpegImageMetadata;
import org.apache.sanselan.formats.tiff.TiffField;
import org.apache.sanselan.formats.tiff.TiffImageMetadata;

public class SanselanMetadataExample {

    public static void main(String[] args) throws Exception {
        printMeatadata(new File("c:/temp/metadata_eample.jpg"));
    }

    public static void printMeatadata(File file) throws ImageReadException, IOException {
        IImageMetadata sanselanmetadata = Sanselan.getMetadata(file);
        if (sanselanmetadata instanceof JpegImageMetadata) {
            JpegImageMetadata jpegMetadata = (JpegImageMetadata) sanselanmetadata;
            TiffImageMetadata tiffImageMetadata = jpegMetadata.getExif();
            
            // print all items
            System.out.println("=== print all items ===");
            printMetadataList(jpegMetadata.getItems());
            
            // print all EXIF
            System.out.println("=== print all EXIF ===");
            printExif(tiffImageMetadata);

            // print all GPS
            System.out.println("=== print GPS ===");
            TiffImageMetadata.GPSInfo gpsInfo = tiffImageMetadata.getGPS();
            System.out.println(gpsInfo);
        }
    }

    private static void printExif(TiffImageMetadata tiffImageMetadata) throws ImageReadException {
        for(Object field : tiffImageMetadata.getAllFields())
        {
            if(field instanceof TiffField)
            {
                TiffField tiffField = (TiffField)field;
                System.out.println(tiffField.getTagName()+ ": " + tiffField.getValueDescription());
            }
        }
    }

    private static void printMetadataList(List items) {
        for (Object item : items) {
            if (item instanceof org.apache.sanselan.common.ImageMetadata.Item) {
                Item tiffItem = (Item) item;
                System.out.println("item: " + tiffItem);
            }
        }
    }
}

Example Result

I will show you the example execution result of the above code.
The test image is below.

The code output following result.

=== print all items ===
item: Image Description: 'MetaData Example'
item: Software: 'Picasa'
item: Exif Offset: 2172
item: XPTitle: 77, 0, 101, 0, 116, 0, 97, 0, 68, 0, 97, 0, 116, 0, 97, 0, 32, 0, 69, 0, 120, 0, 97, 0, 109, 0, 112, 0, 108, 0, 101, 0, 0, 0
item: XPComment: 84, 0, 101, 0, 115, 0, 116, 0, 32, 0, 67, 0, 111, 0, 109, 0, 109, 0, 101, 0, 110, 0, 116, 0, 115, 0, 0, 0
item: Unknown Tag (0xea1c): 28, -22, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0... (2060)
item: Exif Version: 48, 50, 50, 48
item: Exif Image Width: 1440
item: Exif Image Length: 1440
item: Image Unique ID: '199e785efd74401dff564baa559c2f25'
item: Unknown Tag (0xea1c): 28, -22, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0... (2060)
item: Compression: 6
item: XResolution: 72
item: YResolution: 72
item: Resolution Unit: 2
item: Jpg From Raw Start: 4488
item: Jpg From Raw Length: 6780
=== print all EXIF ===
Image Description: 'MetaData Example'
Software: 'Picasa'
Exif Offset: 2172
XPTitle: 77, 0, 101, 0, 116, 0, 97, 0, 68, 0, 97, 0, 116, 0, 97, 0, 32, 0, 69, 0, 120, 0, 97, 0, 109, 0, 112, 0, 108, 0, 101, 0, 0, 0
XPComment: 84, 0, 101, 0, 115, 0, 116, 0, 32, 0, 67, 0, 111, 0, 109, 0, 109, 0, 101, 0, 110, 0, 116, 0, 115, 0, 0, 0
Unknown Tag (0xea1c): 28, -22, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0... (2060)
Exif Version: 48, 50, 50, 48
Exif Image Width: 1440
Exif Image Length: 1440
Image Unique ID: '199e785efd74401dff564baa559c2f25'
Unknown Tag (0xea1c): 28, -22, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0... (2060)
Compression: 6
XResolution: 72
YResolution: 72
Resolution Unit: 2
Jpg From Raw Start: 4488
Jpg From Raw Length: 6780
=== print GPS ===
null