文本框添加背景图片，文本框背景图片,public classpublic class WatermarkTextField extends JTextField { BufferedImage img; TexturePaint texture; public WatermarkTextField(File file) throws IOException { super(); img = ImageIO.read(file); Rectangle rect = new Rectangle(0,0, img.getWidth(null),img.getHeight(null)); texture = new TexturePaint(img, rect); setOpaque(false); } } public void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D)g; g2.setPaint(texture); g.fillRect(0,0,getWidth(),getHeight()); super.paintComponent(g); } public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Watermark JTextField Hack"); JTextField textfield = new WatermarkTextField(new File("red.png")); textfield.setText("A Text Field");frame.getContentPane().add(textfield); frame.pack(); frame.show(); }//该片段来自于
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