genericfileview.java

文件浏览框

package palmsecuresdk.sample.data;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.filechooser.*;

public class GenericFileView extends FileView {
    private String[] fileExts;

    private String ext = "";

    private int fileType = DEFAULT_FILEVIEW;

    public final static int IMAGE_FILEVIEW = 80;

    public final static int DEFAULT_FILEVIEW = 70;

    public GenericFileView(String[] fileExts, int i) {
        super();
        if (fileExts.length >= 1) {
            this.fileExts = fileExts;

            if (i == IMAGE_FILEVIEW)
                fileType = IMAGE_FILEVIEW;
        }
    }

    public Icon getIcon(File f) {
        ext = getExtension(f);

        if (ext.equals("") || ext.equals("lnk")) {
            FileSystemView sv = FileSystemView.getFileSystemView();

            if (sv != null)
                return sv.getSystemIcon(f);

            return super.getIcon(f);
        }
        return getImageIcon(f);
    }

    private Icon getImageIcon(File f) {
        ImageIcon icon;
        for (int i = 0; i < fileExts.length; i++) {
            if (ext.equalsIgnoreCase(fileExts[i])) {

                icon = new ImageIcon(f.getAbsolutePath());

                Image image = icon.getImage();
                image = image.getScaledInstance(50, 50, Image.SCALE_DEFAULT);

                icon = new ImageIcon(image);

                return icon;
            }

        }
        return super.getIcon(f);
    }

    private String getExtension(File file) {
        String filename = file.getName();
        int length = filename.length();
        int i = filename.lastIndexOf('.');
        if (i > 0 && i < length - 1)
            return filename.substring(i + 1).toLowerCase();
        return new String("");
    }

}
/**//*
 method1
 BufferedImage image = new BufferedImage(width, height,
 source.getType());
 image.createGraphics().drawImage(source, 0, 0, width, height, null);

 method2
 private ImageIcon icon;
 private Image image;

 icon = new ImageIcon(url);
 image = icon.getImage();
 image = image.getScaledInstance(width, height, Image.SCALE_DEFAULT);
*/