swingpic.java

swing写的图片浏览器

import java.awt.Container;
import java.awt.Dimension;
import java.awt.Event;
import java.awt.FileDialog;

//import java.awt.Image;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;

//import java.awt.Toolkit;
//import java.awt.event.WindowAdapter;
//import java.awt.event.WindowEvent;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.SwingConstants;
import javax.swing.UIManager;


public class SwingPic extends JFrame {
    String lastDir;
    protected ImageIcon iImage;
    int height;
    int width;
    JLabel labeledPic;
    JScrollPane scroller;
    Container content;

    public SwingPic() {
        try {
            //UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
        }

        // End program when window closes
        /*addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });*/
        setTitle("图像浏览");

        MenuBar mbar = new MenuBar();
        Menu m = new Menu("文件");
        m.add(new MenuItem("打开"));
        m.add(new MenuItem("退出"));
        mbar.add(m);
        setMenuBar(mbar);
        setSize(800, 600);

        labeledPic = new JLabel();
        labeledPic.setHorizontalAlignment(SwingConstants.CENTER);
        scroller = new JScrollPane(labeledPic);
        content = getContentPane();
        content.add(scroller);
        this.show();
    }

    public boolean action(Event evt, Object arg) {
        if (arg.equals("打开")) {
            FileDialog fileDd = new FileDialog(this, "打开图像", FileDialog.LOAD);
            fileDd.setFile("*.gif;*.jpg");
            fileDd.setDirectory(lastDir);
            fileDd.show();

            String picName = fileDd.getFile();
            lastDir = fileDd.getDirectory();

            if (picName != null) {
                iImage = new ImageIcon(lastDir + picName);
                height = iImage.getIconHeight();
                width = iImage.getIconWidth();

                //System.out.println("new image icon" + height + " " + width);
            }

            //System.out.println("new file" + lastDir + picName);
            labeledPic.setIcon(iImage);

            scroller.setPreferredSize(new Dimension(height, width));

            //scroller.setSize(77, 49);
        } else if (arg.equals("退出")) {
            System.exit(0);
        } else {
            return false;
        }

        return true;
    }

    public static void main(String[] args) {
        SwingPic app = new SwingPic();

        //app.show();
    }
}