java 超经漂亮验证码

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1 package com.zly.xsp.image;
2
3 import java.awt.Color;
4 import java.awt.Font;
5 import java.awt.Graphics;
6 import java.awt.Graphics2D;
7 import java.awt.image.BufferedImage;
8 import java.io.IOException;
9 import java.io.OutputStream;
10 import java.util.Random;
11
12 import javax.imageio.ImageIO;
13 import javax.servlet.http.HttpServletRequest;
14 import javax.servlet.http.HttpServletResponse;
15 import javax.servlet.http.HttpSession;
16
17 public class CreateImageCode {
18 // 图片的宽度。
19 private int width = 160;
20 // 图片的高度。
21 private int height = 40;
22 // 验证码字符个数
23 private int codeCount = 4;
24 // 验证码干扰线数
25 private int lineCount = 20;
26 // 验证码
27 private String code = null;
28 // 验证码图片Buffer
29 private BufferedImage buffImg = null;
30 Random random = new Random();
31
32 public CreateImageCode() {
33 creatImage();
34 }
35
36 public CreateImageCode(int width, int height) {
37 this.width = width;
38 this.height = height;
39 creatImage();
40 }
41
42 public CreateImageCode(int width, int height, int codeCount) {
43 this.width = width;
44 this.height = height;
45 this.codeCount = codeCount;
46 creatImage();
47 }
48
49 public CreateImageCode(int width, int height, int codeCount, int lineCount) {
50 this.width = width;
51 this.height = height;
52 this.codeCount = codeCount;
53 this.lineCount = lineCount;
54 creatImage();
55 }
56
57 // 生成图片
58 private void creatImage() {
59 int fontWidth = width / codeCount;// 字体的宽度
60 int fontHeight = height - 5;// 字体的高度
61 int codeY = height - 8;
62
63 // 图像buffer
64 buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
65 Graphics g = buffImg.getGraphics();
66 //Graphics2D g = buffImg.createGraphics();
67 // 设置背景色
68 g.setColor(getRandColor(200, 250));
69 g.fillRect(0, 0, width, height);
70
71
72
73 // 设置字体
74 //Font font1 = getFont(fontHeight);
75 Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
76 g.setFont(font);
77
78 // 设置干扰线
79 for (int i = 0; i < lineCount; i++) {
80 int xs = random.nextInt(width);
81 int ys = random.nextInt(height);
82 int xe = xs + random.nextInt(width);
83 int ye = ys + random.nextInt(height);
84 g.setColor(getRandColor(1, 255));
85 g.drawLine(xs, ys, xe, ye);
86 }
87
88 // 添加噪点
89 float yawpRate = 0.01f;// 噪声率
90 int area = (int) (yawpRate * width * height);
91 for (int i = 0; i < area; i++) {
92 int x = random.nextInt(width);
93 int y = random.nextInt(height);
94
95 buffImg.setRGB(x, y, random.nextInt(255));
96 }
97
98
99 String str1 = randomStr(codeCount);// 得到随机字符
100 this.code = str1;
101 for (int i = 0; i < codeCount; i++) {
102 String strRand = str1.substring(i, i + 1);
103 g.setColor(getRandColor(1, 255));
104 // g.drawString(a,x,y);
105 // a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处
106
107 g.drawString(strRand, ifontWidth+3, codeY);
108 }
109
110
111 }
112
113 // 得到随机字符
114 private String randomStr(int n) {
115 String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
116 String str2 = "";
117 int len = str1.length() - 1;
118 double r;
119 for (int i = 0; i < n; i++) {
120 r = (Math.random()) * len;
121 str2 = str2 + str1.charAt((int) r);
122 }
123 return str2;
124 }
125
126 // 得到随机颜色
127 private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
128 if (fc > 255)
129 fc = 255;
130 if (bc > 255)
131 bc = 255;
132 int r = fc + random.nextInt(bc - fc);
133 int g = fc + random.nextInt(bc - fc);
134 int b = fc + random.nextInt(bc - fc);
135 return new Color(r, g, b);
136 }
137
138 /**
139 * 产生随机字体
140 /
141 private Font getFont(int size) {
142 Random random = new Random();
143 Font font[] = new Font[5];
144 font[0] = new Font("Ravie", Font.PLAIN, size);
145 font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
146 font[2] = new Font("Fixedsys", Font.PLAIN, size);
147 font[3] = new Font("Wide Latin", Font.PLAIN, size);
148 font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
149 return font[random.nextInt(5)];
150 }
151
152 // 扭曲方法
153 private void shear(Graphics g, int w1, int h1, Color color) {
154 shearX(g, w1, h1, color);
155 shearY(g, w1, h1, color);
156 }
157
158 private void shearX(Graphics g, int w1, int h1, Color color) {
159
160 int period = random.nextInt(2);
161
162 boolean borderGap = true;
163 int frames = 1;
164 int phase = random.nextInt(2);
165
166 for (int i = 0; i < h1; i++) {
167 double d = (double) (period >> 1)
168 * Math.sin((double) i / (double) period
169 + (6.2831853071795862D * (double) phase)
170 / (double) frames);
171 g.copyArea(0, i, w1, 1, (int) d, 0);
172 if (borderGap) {
173 g.setColor(color);
174 g.drawLine((int) d, i, 0, i);
175 g.drawLine((int) d + w1, i, w1, i);
176 }
177 }
178
179 }
180
181 private void shearY(Graphics g, int w1, int h1, Color color) {
182
183 int period = random.nextInt(40) + 10; // 50;
184
185 boolean borderGap = true;
186 int frames = 20;
187 int phase = 7;
188 for (int i = 0; i < w1; i++) {
189 double d = (double) (period >> 1)
190 * Math.sin((double) i / (double) period
191 + (6.2831853071795862D * (double) phase)
192 / (double) frames);
193 g.copyArea(i, 0, 1, h1, 0, (int) d);
194 if (borderGap) {
195 g.setColor(color);
196 g.drawLine(i, (int) d, i, 0);
197 g.drawLine(i, (int) d + h1, i, h1);
198 }
199
200 }
201
202 }
203
204
205
206 public void write(OutputStream sos) throws IOException {
207 ImageIO.write(buffImg, "png", sos);
208 sos.close();
209 }
210
211 public BufferedImage getBuffImg() {
212 return buffImg;
213 }
214
215 public String getCode() {
216 return code.toLowerCase();
217 }
218
219 //使用方法
220 /public void getCode3(HttpServletRequest req, HttpServletResponse response,HttpSession session) throws IOException{
221 // 设置响应的类型格式为图片格式
222 response.setContentType("image/jpeg");
223 //禁止图像缓存。
224 response.setHeader("Pragma", "no-cache");
225 response.setHeader("Cache-Control", "no-cache");
226 response.setDateHeader("Expires", 0);
227
228
229 CreateImageCode vCode = new CreateImageCode(100,30,5,10);
230 session.setAttribute("code", vCode.getCode());
231 vCode.write(response.getOutputStream());
232 }/
233
234 }

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