Go语言视频零基础入门到精通

javalearner

玩Swing 没点美感怎么行..嘿嘿 ^v^
怎么能沉迷与JTextField那种白色的背景呢???太单调的..看不出像我这么有美感的人..怎能让它显示出我认为不好看的东西!!下面就来解决JTextFiled!! 为他添加水印!


代码很简单:

1. import java.awt.Color;
   
2. import java.awt.Graphics;
   
3. import java.awt.Graphics2D;
   
4. import java.awt.GridLayout;
   
5. import java.awt.Rectangle;
   
6. import java.awt.TexturePaint;
   
7. import java.awt.image.BufferedImage;
   
8. import java.io.File;
   
9. import java.io.IOException;
   
10. import javax.imageio.ImageIO;
    
11. import javax.swing.JButton;
    
12. import javax.swing.JFrame;
    
13. import javax.swing.JTextField;
    
14. public class WatermarkTextField extends JTextField {
    
15.   BufferedImage img;
    
16.   TexturePaint texture;
    
17.   public WatermarkTextField(File file) throws IOException { //临时就把异常往外抛了.
    
18.    super();                                                 //方法接收一个Image图片文件.
    
19.    img = ImageIO.read(file);
    
20.    Rectangle rect = new Rectangle(0,0,
    
21.    img.getWidth(null),img.getHeight(null));
    
22.    texture = new TexturePaint(img, rect);
    
23.    setOpaque(false);
    
24.   }
    
25.   public void paintComponent(Graphics g) {
    
26.    Graphics2D g2 = (Graphics2D)g;
    
27.    g2.setPaint(texture);
    
28.    g.fillRect(0,0,getWidth(),getHeight());
    
29.    super.paintComponent(g);
    
30.   }
    
31. //Main类我就不说了Java的基础.
    
32.   public static void main(String[] args) throws Exception {
    
33.    JFrame frame = new JFrame("Watermark JTextField Hack");
    
34.    frame.setLayout(new GridLayout(1,2));
    
35.    JTextField textfield = new WatermarkTextField(new File("images/LogoBk.jpg"));
    
36.    textfield.setForeground(Color.white);
    
37.    textfield.setText("A Text Field");
    
38.    textfield.setSize(120,30);
    
39.    frame.getContentPane().add(textfield);
    
40.    frame.getContentPane().add(new JButton("前面那家伙真漂亮"));
    
41.    frame.setSize(250,60);
    
42.    frame.setVisible(true);
    
43.   }
    
44. }
45. 
    

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源码下载：http://file.javaxxz.com/2014/11/18/235743187.zip