您可以使用自定义TransferHandler
来执行此操作。
根据 Swing 教程中关于使用和创建数据风格的部分,您应该能够使用 char[] 作为写入剪贴板的对象。
但是,我无法让它工作并最终将 StringBuilder 写入剪贴板。如果我尝试使用 char [],我注释掉了代码,也许其他人可以弄清楚我做错了什么。
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.io.*;
public class PasswordHandler extends TransferHandler
{
// public final static DataFlavor CHAR_ARRAY_FLAVOR = new DataFlavor(char[].class, "Char Array");
public final static DataFlavor CHAR_ARRAY_FLAVOR = new DataFlavor(StringBuilder.class, "StringBuilder");
@Override
public int getSourceActions(JComponent c)
{
return COPY;
}
@Override
public Transferable createTransferable(final JComponent c)
{
return new Transferable()
{
@Override
public Object getTransferData(DataFlavor flavor)
{
JPasswordField textField = (JPasswordField)c;
// return textField.getPassword();
return new StringBuilder( textField.getText() );
}
@Override
public DataFlavor[] getTransferDataFlavors()
{
DataFlavor[] flavors = new DataFlavor[1];
flavors[0] = CHAR_ARRAY_FLAVOR;
return flavors;
}
@Override
public boolean isDataFlavorSupported(DataFlavor flavor)
{
return flavor.equals(CHAR_ARRAY_FLAVOR);
}
};
}
@Override
public boolean canImport(TransferSupport support)
{
boolean canImport = support.isDataFlavorSupported(CHAR_ARRAY_FLAVOR);
return canImport;
}
@Override
public boolean importData(TransferSupport support)
{
// char[] password;
StringBuilder password;
try
{
// password = (char[])support.getTransferable().getTransferData(CHAR_ARRAY_FLAVOR);
password = (StringBuilder)support.getTransferable().getTransferData(CHAR_ARRAY_FLAVOR);
}
catch (Exception e)
{
e.printStackTrace();
return false;
}
JPasswordField textField = (JPasswordField)support.getComponent();
textField.setText(password.toString());
return true;
}
private static void createAndShowUI()
{
JPasswordField tf1 = new JPasswordField(10);
JPasswordField tf2 = new JPasswordField(10);
TransferHandler handler = new PasswordHandler();
tf1.setTransferHandler( handler );
tf2.setTransferHandler( handler );
tf1.putClientProperty("JPasswordField.cutCopyAllowed",true);
tf2.putClientProperty("JPasswordField.cutCopyAllowed",true);
JFrame frame = new JFrame("Password Copy");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(tf1, BorderLayout.WEST);
frame.add(tf2, BorderLayout.EAST);
frame.add(new JTextField(), BorderLayout.SOUTH);
frame.pack();
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
该代码从密码字段中获取整个文本。如果您只想要选定的字符,那么您需要修改getTransferData()
方法以仅将选定的字符添加到 StringBuilder。