Java 在jLabel上重新调整图像大小
我试图在java中的jLabel上重新调整图像的大小,下面给出了不起作用的代码片段:Java 在jLabel上重新调整图像大小,java,image,resize,jlabel,autoresize,Java,Image,Resize,Jlabel,Autoresize,我试图在java中的jLabel上重新调整图像的大小,下面给出了不起作用的代码片段: ImageIcon imgThisImg = new ImageIcon(rs.getString("PictureURL")); Image image=null; image=jLabel2.createImage(120, 50); ImageIcon imi=new ImageIcon(image); jLabel2.setIcon(imi); 当我运行它时,我的jlabel上什么也没有。事实上,如果
ImageIcon imgThisImg = new ImageIcon(rs.getString("PictureURL"));
Image image=null;
image=jLabel2.createImage(120, 50);
ImageIcon imi=new ImageIcon(image);
jLabel2.setIcon(imi);
当我运行它时,我的jlabel上什么也没有。事实上,如果我运行下面的代码,它可以正常工作。问题是我想要一个缩小的图像:
ImageIcon imgThisImg = new ImageIcon(rs.getString("PictureURL"));
jLabel2.setIcon(imgThisImg);
我找不到我错在哪里。请给我一些建议,我该怎么做
谢谢请参阅下面一个更好的图像缩放解决方案。在下面的代码中,
newImage
是重新缩放的图像
BufferedImage image = ImageIO.read(imageFile);
BufferedImage newImage = new BufferedImage(newWidth, newHeight, image.getType());
Graphics2D g2 = newImage.createGraphics();
g2.drawImage(image, 0, 0, newWidth, newHeight, null);
g2.dispose();
下面是一个渲染组件的代码,可能会给您一些提示
class PaintCommandListCellRenderer extends DefaultListCellRenderer {
@Override
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean hasFocus) {
Component c = super.getListCellRendererComponent(list, value, index, isSelected, hasFocus);
if (c instanceof JLabel && value instanceof PaintCommand) {
JLabel l = (JLabel)c;
PaintCommand pc = (PaintCommand)value;
try {
BufferedImage bi = pc.getUndoImage();
double w = bi.getWidth();
double ideal = 200d;
double ratio = w/ideal;
int aw = (int)(w/ratio);
int ah = (int)(bi.getHeight()/ratio);
BufferedImage bj = new BufferedImage(
aw,ah,BufferedImage.TYPE_INT_ARGB);
Graphics2D g = bj.createGraphics();
g.drawImage(bi, 0, 0, aw, ah, null);
g.dispose();
l.setIcon(new ImageIcon(bj));
l.setText("");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return c;
}
}
你可以试着看一看