Converter.java

package edu.mbl.jif.imagej;

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;

public class Converter extends JFrame {
  JLabel promptLabel;
  JTextField prompt;
  JButton promptButton;
  JFileChooser fileChooser;
  JComboBox comboBox;
  JButton saveButton;
  public Converter() {
    super("Image Conversion");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    Container contentPane = getContentPane();
    JPanel inputPanel = new JPanel();
    promptLabel = new JLabel("Filename:");
    inputPanel.add(promptLabel);
    prompt = new JTextField(20);
    inputPanel.add(prompt);
    promptButton = new JButton("Browse");
    inputPanel.add(promptButton);
    contentPane.add(inputPanel, BorderLayout.NORTH);

    fileChooser = new JFileChooser();
    promptButton.addActionListener(
      new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          int returnValue =
              fileChooser.showOpenDialog(null);
          if (returnValue ==
              JFileChooser.APPROVE_OPTION) {
            File selectedFile =
                fileChooser.getSelectedFile();
            if (selectedFile != null) {
              prompt.setText(selectedFile.getAbsolutePath());
            }
          }
        }
      }
    );

    JPanel outputPanel = new JPanel();
    String writerFormats[] =
        ImageIO.getWriterFormatNames();
    ComboBoxModel comboBoxModel = new
        DefaultComboBoxModel(writerFormats);
    comboBox = new JComboBox(comboBoxModel);
    outputPanel.add(comboBox);
    saveButton = new JButton("Save");
    outputPanel.add(saveButton);
    saveButton.addActionListener(
      new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          try {
            String name = prompt.getText();
            File file = new File(name);
            if (file.exists()) {
              BufferedImage image =
                  ImageIO.read(file.toURL());
              if (image == null) {
                  System.err.println("Invalid input file format");
              } else {
                String selection =
                    (String)comboBox.getSelectedItem();
                String outputFilename = name +
                    "." + selection;
                File outputFile = new File(outputFilename);
                boolean found = ImageIO.write(image,
                    selection, outputFile);
                if (found) {
                  JDialog window = new JDialog();
                  Container windowContent =
                      window.getContentPane();
                  BufferedImage newImage =
                      ImageIO.read(outputFile);
                  JLabel label = new JLabel(new
                      ImageIcon(newImage));
                  JScrollPane pane = new
                      JScrollPane(label);
                  windowContent.add(pane,
                      BorderLayout.CENTER);
                  window.setSize(300, 300);
                  window.setVisible(true);
                } else {
                  System.err.println("Error saving");
                }
              }
            } else {
              System.err.println("Bad filename");
            }
          } catch (MalformedURLException mur) {
            System.err.println("Bad filename");
          } catch (IOException ioe) {
            System.err.println("Error reading file");
          }
        }
      }
    );

    contentPane.add(outputPanel, BorderLayout.SOUTH);

  }
  public static void main(String args[]) {
    JFrame frame = new Converter();
    frame.pack();
    frame.setVisible(true);
  }
}