java JPasswordField 如何设置密码
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JPasswordField how to set password
提问by alexj
Hello I am using a JPasswordFieldwhen I want to read it it is no problem with getPasswordbut what I am doing is when the Password is not set it shows a InputDialogwhere you can type in the password and then it should set the the Password in to the JPasswordFieldbut when I use setTextit does not set it and there is not method setPassword(). So my question is how can i set a password to a JPasswordField?
你好我使用的是JPasswordField当我想读它，它是没有问题的getPassword，但我做的是当没有设置口令也显示了InputDialog在那里你可以键入密码，然后将它应该设置密码到JPasswordField，但当我使用setText它时没有设置它并且没有方法setPassword()。所以我的问题是如何将密码设置为 a JPasswordField？
String password = "";
JPasswordField passwordField = new JPasswordField();
passwordField.setEchoChar('*');
Object[] obj = {"Bitte ihr PAsswort eingeben:\n\n", passwordField};
Object stringArray[] = {"OK","Cancel"};
if (JOptionPane.showOptionDialog(null, obj, "Passwort", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, stringArray, obj) == JOptionPane.WARNING_MESSAGE)
{
password = new String(passwordField.getPassword());
}
txtFtpUser.setText(username);
panel_1.remove(txtFtpPassword);
txtFtpPassword = new JPasswordField(password);
txtFtpPassword.setBounds(10, 113, 206, 23);
panel_1.add(txtFtpPassword);
回答by Robin
You claim that setTextis not workingfor a JPasswordFieldis incorrect. See the following piece of code which just works as expected:
你声称setText是不工作的JPasswordField不正确。请参阅以下代码，它按预期工作：
public static void main( String[] args ) {
EventQueue.invokeLater( new Runnable() {
@Override
public void run() {
JFrame testFrame = new JFrame( "Test" );
JPasswordField field = new JPasswordField( );
field.setColumns( 20 );
field.setText( "Password" );
testFrame.add( field );
testFrame.pack();
testFrame.setVisible( true );
testFrame.setDefaultCloseOperation( WindowConstants.EXIT_ON_CLOSE );
}
} );
}
The variant where you pass the text in the constructor (as you did in your code) also works as expected.
您在构造函数中传递文本的变体（就像您在代码中所做的那样）也按预期工作。
So I would search in another direction. The following part
所以我会寻找另一个方向。以下部分
txtFtpUser.setText(username);
panel_1.remove(txtFtpPassword);
txtFtpPassword = new JPasswordField(password);
txtFtpPassword.setBounds(10, 113, 206, 23);
panel_1.add(txtFtpPassword);
makes me wonder whether you see your new JPasswordFieldin your UI. When you add/remove components from a Containeryou need to invalidate the layout, as documented in the Container#addand Container#removemethods.
让我想知道您是否JPasswordField在 UI 中看到了您的新内容。当您从 a 添加/删除组件时，Container您需要使布局无效，如Container#add和Container#remove方法中所述。
Note: be aware of the security issues when passing the password around as a String. But according to your comments you are already aware of this.
注意：将密码作为String. 但根据您的评论，您已经意识到这一点。
回答by alexj
I found the Error here it was:
我在这里发现错误是：
if (JOptionPane.showOptionDialog(null, obj, "Passwort", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, stringArray, obj) == JOptionPane.WARNING_MESSAGE)
{
password = new String(passwordField.getPassword());
}
It checked it was a Warning Message but it was a YES_OPTION :) Thank you for all your help.
它检查了它是一个警告消息，但它是一个 YES_OPTION :) 谢谢你的帮助。
