Swing透明遇到输入法等于白屏

JDK1.7仍然存在~~】

// 最简单的方法：禁止使用DirectDraw

System.setProperty("sun.java2d.noddraw", "true"); // 防止激活输入法时白屏

// 或者重写JTextField的paintComponent()方法：重绘缓存

 

import java.awt.*;import java.awt.event.*;import java.awt.image.*;import javax.swing.*;public class Test {    public static class JTextField2 extends JTextField {        private static final long serialVersionUID = 1L;        private BufferedImage buffer = null;        @Override public void paintComponent(Graphics g) {            Component window = this.getTopLevelAncestor();            if (window instanceof Window && !((Window)window).isOpaque()) {                // This is a translucent window, so we need to draw to a buffer                // first to work around a bug in the DirectDraw rendering in Swing.                int w = this.getWidth();                int h = this.getHeight();                if (buffer == null || buffer.getWidth() != w || buffer.getHeight() != h) {                    // Create a new buffer based on the current size.                    GraphicsConfiguration gc = this.getGraphicsConfiguration();                    buffer = gc.createCompatibleImage(w, h, BufferedImage.TRANSLUCENT);                }                // Use the super class's paintComponent implementation to draw to                // the buffer, then write that buffer to the original Graphics object.                Graphics bufferGraphics = buffer.createGraphics();                try {                    super.paintComponent(bufferGraphics);                } finally {                    bufferGraphics.dispose();                }                g.drawImage(buffer, 0, 0, w, h, 0, 0, w, h, null);            } else {                // This is not a translucent window, so we can call the super class                // implementation directly.                super.paintComponent(g);            }                }    }    public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() {            @Override public void run() {                final JFrame frame = new JFrame();                frame.setUndecorated(true);                frame.setBackground(new Color(96, 128, 160, 192));                JTextField textField = new JTextField2();                                JButton exitButton = new JButton("Exit");                exitButton.addActionListener(new ActionListener() {                    @Override public void actionPerformed(ActionEvent e) {                        frame.dispose();                    }                });                frame.add(exitButton, BorderLayout.PAGE_START);                frame.add(textField, BorderLayout.PAGE_END);                frame.setSize(400, 400);                frame.setLocationRelativeTo(null);                frame.setVisible(true);            }        });    }}