java JOptionPane 中的文本换行？
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Text wrap in JOptionPane?
提问by laksys
I'm using following code to display error message in my swing application
我正在使用以下代码在我的 Swing 应用程序中显示错误消息
try {
...
} catch (Exception exp) {
JOptionPane.showMessageDialog(this, exp.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
The width of the error dialog goes lengthy depending on the message. Is there any way to wrap the error message?
错误对话框的宽度根据消息而变长。有没有办法包装错误信息？
回答by Andrew Thompson
A JOptionPanewill use a JLabelto display text by default. A label will format HTML. Set the maximum width in CSS.
AJOptionPane将JLabel默认使用 a来显示文本。标签将格式化 HTML。在 CSS 中设置最大宽度。
JOptionPane.showMessageDialog(
this,
"<html><body><p style='width: 200px;'>"+exp.getMessage()+"</p></body></html>",
"Error",
JOptionPane.ERROR_MESSAGE);
More generally, see How to Use HTML in Swing Components, as well as this simple example of using HTML in JLabel.
更一般地说，请参阅如何在 Swing 组件中使用 HTML，以及在JLabel.
回答by trashgod
Add your message to a text component that can wrap, such as JEditorPane, then specify the editor pane as the messageto your JOptionPane. See How to Use Editor Panes and Text Panesand How to Make Dialogsfor examples.
添加您的邮件文本组件可以包装，例如JEditorPane，然后指定编辑窗格为message您JOptionPane。有关示例，请参阅如何使用编辑器窗格和文本窗格以及如何制作对话框。
Addendum: As an alternative to wrapping, consider a line-oriented-approach in a scroll pane, as shown below.
附录：作为换行的替代方法，考虑在滚动窗格中采用面向行的方法，如下所示。
f.add(new JButton(new AbstractAction("Oh noes!") {
@Override
public void actionPerformed(ActionEvent action) {
try {
throw new UnsupportedOperationException("Not supported yet.");
} catch (Exception e) {
StringBuilder sb = new StringBuilder("Error: ");
sb.append(e.getMessage());
sb.append("\n");
for (StackTraceElement ste : e.getStackTrace()) {
sb.append(ste.toString());
sb.append("\n");
}
JTextArea jta = new JTextArea(sb.toString());
JScrollPane jsp = new JScrollPane(jta){
@Override
public Dimension getPreferredSize() {
return new Dimension(480, 320);
}
};
JOptionPane.showMessageDialog(
null, jsp, "Error", JOptionPane.ERROR_MESSAGE);
}
}
}));
