看起来使用ImageIO.read加载的PNG文件会忽略alpha通道。(我尝试过JRE 6 update 20)
是个bug吗?
示例:
public class Test extends JFrame
{
public Test()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton b = new JButton("Test");
try
{
b.setIcon(new ImageIcon(ImageIO.read(new File("D:\\image.png"))));
}
catch (IOException e2)
{
}
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
}
});
getContentPane().add(b, BorderLayout.CENTER);
setSize(500,500);
setVisible(true);
}
/**
* @param args
*/
public static void main(String[] args)
{
new Test();
}
}