1 package javashiyan;
2
3 import java.awt.Color;
4 import java.awt.event.ActionEvent;
5 import java.awt.event.ActionListener;
6
7 import javax.swing.*;
8
9 public class Yanzhen extends JFrame
10 {
11 //定义成员变量
12 private Mypanel mp;
13 private JButton b;
14 private JTextField txt;
15 private ActionListener listener;
16
17 public Yanzhen()
18 {
19 Realize();
20 }
21 public void Realize()
22 {
23 JFrame f=new JFrame("验证码");
24 //实例化
25 b=new JButton();
26 b.addActionListener(listener);
27 ActionEvent e;
28 b.setIcon(new ImageIcon("D://button//刷新.jpg"));//载入图片
29 b.setLocation(200,100);//设置位置
30 b.setSize(32,32);//设置大小
31 b.setVisible(true);//设置显示
32
33 txt=new JTextField();
34 txt.setSize(90,30);
35 txt.setLocation(10,100);
36 txt.setVisible(true);
37
38 mp=new Mypanel();
39 mp.setSize(100,30);
40 mp.setLocation(100,100);
41
42 JButton jb=new JButton();
43
44
45 f.add(mp);
46 f.add(b);
47 f.add(txt);
48
49 f.setLayout(null);
50 f.setSize(400, 400);//设置界面大小
51 f.getContentPane().setBackground(Color.white);//设置界面的背景颜色
52 f.getContentPane().setVisible(true);
53 f.setVisible(true);
54 }
55
56
57
58 public void actionPerformed(ActionEvent e) {
59 // TODO Auto-generated method stub
60
61
62 }
63 }
1 package javashiyan;
2
3 import java.awt.*;
4 import java.util.*;
5
6 public class Mypanel extends Panel {
7 public void paint(Graphics g)
8 {
9 int height = 50;
10 int width = 90;
11 //验证码框背景颜色
12 g.setColor(Color.white);
13 //填充验证码背景
14 g.fillRect(0, 0, width, height);
15 g.setColor(Color.BLACK);
16 g.drawRect(0, 0, width-1, height-1);
17 Random r = new Random();
18 for(int i = 0;i<100;i++)
19 {
20 int x = r.nextInt(width)-1;
21 int y = r.nextInt(height)-1;
22 g.drawOval(x, y, 2, 2);//画干扰的圆点
23 }
24 for(int i=0;i<3;i++)
25 {
26 int x1=r.nextInt(width)-1;
27 int y1=r.nextInt(height)-1;
28 int x2=r.nextInt(width)-1;
29 int y2=r.nextInt(height)-1;
30 g.drawLine(x1, y1, x2, y2);//画干扰的线段
31 }
32
33 g.setFont(new Font("黑体",Font.BOLD,20));//设置验证码字体以及大小
34 g.setColor(Color.BLUE);//设置验证码字体颜色
35 //生成随机验证码
36 char[] tmp = ("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
37 StringBuilder sb = new StringBuilder();
38 for(int i = 0;i<4;i++)
39 {
40 int pos = r.nextInt(tmp.length);
41 char c = tmp[pos];
42 sb.append(c + " ");
43 }
44 g.drawString(sb.toString(), 10, 15);//写入验证码
45 }
46 }
1 package javashiyan;
2
3
4
5 import java.util.Random;
6
7 public class main {
8
9 public static void main(String[] args)
10 {
11 Yanzhen dang=new Yanzhen();
12 }
13
14 }
15
