java verifycode_JavaWeb基础—VerifyCode源码

1 packagecom.jiangbei.verifycodeutils;2

3 importjava.awt.BasicStroke;4 importjava.awt.Color;5 importjava.awt.Font;6 importjava.awt.Graphics2D;7 importjava.awt.image.BufferedImage;8 importjava.io.IOException;9 importjava.io.OutputStream;10 importjava.util.Random;11

12 importjavax.imageio.ImageIO;13

14 public classVerifyCode {15

16 private int w = 70;17

18 private int h = 35;19

20 private Random r = newRandom();21

22 //{“宋体”, “华文楷体”, “黑体”, “华文新魏”, “华文隶书”, “微软雅黑”, “楷体_GB2312”}

23

24 private String[] fontNames = {“宋体”, “华文楷体”, “黑体”, “微软雅黑”, “楷体_GB2312”};25

26 //可选字符

27

28 private String codes = “23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ”;29

30 //背景色

31

32 private Color bgColor = new Color(255, 255, 255);33

34 //验证码上的文本

35

36 privateString text ;37

38 //生成随机的颜色

39

40 privateColor randomColor () {41

42 int red = r.nextInt(150);43

44 int green = r.nextInt(150);45

46 int blue = r.nextInt(150);47

48 return newColor(red, green, blue);49

50 }51

52 //生成随机的字体

53

54 privateFont randomFont () {55

56 int index =r.nextInt(fontNames.length);57

58 String fontName = fontNames[index];//生成随机的字体名称

59

60 int style = r.nextInt(4);//生成随机的样式, 0(无样式), 1(粗体), 2(斜体), 3(粗体+斜体)

61

62 int size = r.nextInt(5) + 24; //生成随机字号, 24 ~ 28

63

64 return newFont(fontName, style, size);65

66 }67

68 //画干扰线

69

70 private voiddrawLine (BufferedImage image) {71

72 int num = 3;//一共画3条

73

74 Graphics2D g2 =(Graphics2D)image.getGraphics();75

76 for(int i = 0; i < num; i++) {//生成两个点的坐标，即4个值

77

78 int x1 =r.nextInt(w);79

80 int y1 =r.nextInt(h);81

82 int x2 =r.nextInt(w);83

84 int y2 =r.nextInt(h);85

86 g2.setStroke(new BasicStroke(1.5F));87

88 g2.setColor(Color.BLUE); //干扰线是蓝色

89

90 g2.drawLine(x1, y1, x2, y2);//画线

91

92 }93

94 }95

96 //随机生成一个字符

97

98 private charrandomChar () {99

100 int index =r.nextInt(codes.length());101

102 returncodes.charAt(index);103

104 }105

106 //创建BufferedImage

107

108 privateBufferedImage createImage () {109

110 BufferedImage image = newBufferedImage(w, h, BufferedImage.TYPE_INT_RGB);111

112 Graphics2D g2 =(Graphics2D)image.getGraphics();113

114 g2.setColor(this.bgColor);115

116 g2.fillRect(0, 0, w, h);117

118 returnimage;119

120 }121

122 //调用这个方法得到验证码

123

124 publicBufferedImage getImage () {125

126 BufferedImage image = createImage();//创建图片缓冲区

127

128 Graphics2D g2 = (Graphics2D)image.getGraphics();//得到绘制环境

129

130 StringBuilder sb = new StringBuilder();//用来装载生成的验证码文本131

132 //向图片中画4个字符

133

134 for(int i = 0; i < 4; i++) {//循环四次，每次生成一个字符

135

136 String s = randomChar() + “”;//随机生成一个字母

137

138 sb.append(s); //把字母添加到sb中

139

140 float x = i * 1.0F * w / 4; //设置当前字符的x轴坐标

141

142 g2.setFont(randomFont()); //设置随机字体

143

144 g2.setColor(randomColor()); //设置随机颜色

145

146 g2.drawString(s, x, h-5); //画图

147

148 }149

150 this.text = sb.toString(); //把生成的字符串赋给了this.text

151

152 drawLine(image); //添加干扰线

153

154 returnimage;155

156 }157

158 //返回验证码图片上的文本

159

160 publicString getText () {161

162 returntext;163

164 }165

166 //保存图片到指定的输出流

167

168 public static voidoutput (BufferedImage image, OutputStream out)169

170 throwsIOException {171

172 ImageIO.write(image, “JPEG”, out);173

174 }175

176 }