可以用JFileChooser类中的showSaveDialog方法。
比如这个例子,打开对话框保存了一个图片。
JFileChooser jfc=new JFileChooser(".");
jfc.setFileSelectionMode(JFileChooser.FILES_ONLY);
FileNameExtensionFilter filter1 = new FileNameExtensionFilter("*.png", "png");
FileNameExtensionFilter filter2 = new FileNameExtensionFilter("*.jpg", "jpg");
FileNameExtensionFilter filter3 = new FileNameExtensionFilter("*.jpeg", "jpeg");
jfc.addChoosableFileFilter(filter1);
jfc.addChoosableFileFilter(filter2);
jfc.addChoosableFileFilter(filter3);
jfc.setAcceptAllFileFilterUsed(false);
jfc.setFileFilter(filter1);
jfc.setSelectedFile(new File("2D_Code"));
int returnVal = jfc.showSaveDialog(MainFrame.this);
if(returnVal == JFileChooser.APPROVE_OPTION)
{
File file = jfc.getSelectedFile();
if(file.exists())
{
int i = JOptionPane.showConfirmDialog(this, "File exists! Overwrite it?","Attention",JOptionPane.OK_OPTION);
if(i != JOptionPane.OK_OPTION)
return;
}
try {
ImageIO.write(image, imgType, file);
JOptionPane.showMessageDialog(this, "Successfully saved!");
} catch (IOException e1) {
JOptionPane.showMessageDialog(this, "Failed saving.");
e1.printStackTrace();
}
}
除了showSaveDialog方法赖保存文件外,还有showOpenDialog来打开文件对话框
具体的请参阅JFileChooser的API