java.awt.HeadlessException

Question

JFileChooser chooser = new JFileChooser();
JDialog dialog=new JDialog();
dialog.setAlwaysOnTop(true);
/*System.out.println("is always on top?"+dialog.isAlwaysOnTop());*/
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int returnVal = chooser.showOpenDialog(dialog);

String path = null;

if(returnVal == JFileChooser.APPROVE_OPTION) {

    path=chooser.getSelectedFile().getAbsolutePath();

}

我在 Servlet 的 doGet 方法中编写了这段代码。当我部署在 Linux 服务器中时，出现以下异常:

java.awt.HeadlessException
    at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:159)

有人知道如何克服这个问题吗？

Answer 1

HeadlessException

Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse.