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我希望能够从 exif 格式的 jpeg 或 png 文件中提取元数据。因此，我在 eclipse 上安装了“元数据提取器”库并复制了下面的代码，但它显示错误：

Error: Unable to initialize main class metadata.SampleUsage
Caused by: java.lang.NoClassDefFoundError: com/drew/imaging/ImageProcessingException

你能帮我解决这个问题吗？

package metadata;

import com.drew.imaging.ImageMetadataReader;
import com.drew.imaging.ImageProcessingException;
import com.drew.imaging.jpeg.JpegMetadataReader;
import com.drew.imaging.jpeg.JpegProcessingException;
import com.drew.imaging.jpeg.JpegSegmentMetadataReader;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;
import com.drew.metadata.exif.ExifReader;
import com.drew.metadata.iptc.IptcReader;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;

/**
 * Showcases the most popular ways of using the metadata-extractor library.
 * <p>
 * For more information, see the project wiki: https://github.com/drewnoakes/metadata-extractor/wiki/GettingStarted
 *
 * @author Drew Noakes https://drewnoakes.com
 */
public class SampleUsage
{
    public static void main(String[] args)
    {
        File file = new File("Tests/Data/withIptcExifGps.jpg");

        // There are multiple ways to get a Metadata object for a file

        //
        // SCENARIO 1: UNKNOWN FILE TYPE
        //
        // This is the most generic approach.  It will transparently determine the file type and invoke the appropriate
        // readers.  In most cases, this is the most appropriate usage.  This will handle JPEG, TIFF, GIF, BMP and RAW
        // (CRW/CR2/NEF/RW2/ORF) files and extract whatever metadata is available and understood.
        //
        try {
            Metadata metadata = ImageMetadataReader.readMetadata(file);

            print(metadata, "Using ImageMetadataReader");
        } catch (ImageProcessingException e) {
            print(e);
        } catch (IOException e) {
            print(e);
        }
    }
    /**
     * Write all extracted values to stdout.
     */
    private static void print(Metadata metadata, String method)
    {
        System.out.println();
        System.out.println("-------------------------------------------------");
        System.out.print(' ');
        System.out.print(method);
        System.out.println("-------------------------------------------------");
        System.out.println();

        //
        // A Metadata object contains multiple Directory objects
        //
        for (Directory directory : metadata.getDirectories()) {

            //
            // Each Directory stores values in Tag objects
            //
            for (Tag tag : directory.getTags()) {
                System.out.println(tag);
            }

            //
            // Each Directory may also contain error messages
            //
            for (String error : directory.getErrors()) {
                System.err.println("ERROR: " + error);
            }
        }
    }

    private static void print(Exception exception)
    {
        System.err.println("EXCEPTION: " + exception);
    }
}
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