1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Toolkit;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.util.Random;

import javax.swing.JFrame;

public class CheckCode extends JFrame {

private static Random random = new Random();

private int width = 53;//验证码宽度

private int height =25;//验证码高度

private int font_size = 20;//验证码颜色

private int x = 100;//验证码所在窗体X坐标

private int y = 100;//验证码所在窗体Y坐标

private int jam = 5;//干扰元素 建议使用 4~7 之间的数字

private String code = "";//保存验证码

public CheckCode(){//初始化窗体信息

super("验证码");

setVisible(true);

setBounds((Toolkit.getDefaultToolkit().getScreenSize().width-300)/2, (Toolkit.getDefaultToolkit().getScreenSize().height-300)/2, 300, 200);

setDefaultCloseOperation(EXIT_ON_CLOSE);

addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

repaint();

}

});

}

public Color getRandomColor(){//获得随机颜色

int R=random.nextInt(255),G=random.nextInt(255),B=random.nextInt(255);

return new Color(R,G,B);

}

public String getRandomString(){//获得验证码

int num = random.nextInt(9);

code = num+"";

return num+"";

}

public void checkCode(Graphics g){// 绘画验证码

drawBorder(g); 

drawCode(g);

drawJam(g);

}

public void drawBorder(Graphics g){//绘画边框和背景

Color gc = g.getColor();

g.setColor(Color.WHITE);

g.fillRect(x, y, width, height);

g.setColor(Color.BLACK);

g.drawRect(x, y, width, height);

g.setColor(gc);

}

public void drawCode(Graphics g){//绘画验证码内容

Color gc = g.getColor();

for(int i=0;i<4;i++){

g.setColor(getRandomColor());

g.setFont(new Font("宋体",Font.BOLD,font_size));

g.drawString(getRandomString(), x+5+(i*12), y+font_size);

}

g.setColor(gc);

}

public void drawJam(Graphics g){//绘画干扰元素

Color gc = g.getColor();

for(int i=0;i<jam;i++){

g.setColor(getRandomColor());

g.drawLine(x+random.nextInt(width), y+random.nextInt(height), x+random.nextInt(width), y+random.nextInt(height));

}

g.setColor(gc);

}

public void paint(Graphics g) {

Color c = g.getColor();

g.drawString("单击可刷新验证码", 30, 50);

checkCode(g);

g.setColor(c);

}

public static void main(String[] args) {

new CheckCode();

}

}