1 package com.woniuxy.busniess.servlet;
  2 
  3 import java.awt.*;
  4 import java.awt.geom.*;
  5 import java.awt.image.BufferedImage;
  6 import java.io.IOException;
  7 import java.util.Random;
  8 import javax.imageio.ImageIO;
  9 import javax.servlet.ServletException;
 10 import javax.servlet.annotation.WebServlet;
 11 import javax.servlet.http.HttpServlet;
 12 import javax.servlet.http.HttpServletRequest;
 13 import javax.servlet.http.HttpServletResponse;
 14 import javax.servlet.http.HttpSession;
 15 
 16 
 17 /**
 18 * 图片验证码生成
 19 * @author xumin
 20 *
 21 */
 22 @WebServlet("/PictureCheckCodeServlet")
 23 public class PictureCheckCodeServlet extends HttpServlet {
 24 
 25 
 26 
 27 
 28     // 获取随机颜色
 29 
 30     /**
 31      *
 32      */
 33     private static final long serialVersionUID = 1L;
 34 
 35 
 36 
 37     public Color getRandColor(int s, int e) {
 38 
 39         Random random = new Random();
 40 
 41         if (s > 255) s = 255;
 42 
 43         if (e > 255) e = 255;
 44 
 45         int r = s + random.nextInt(e - s); //随机生成RGB颜色中的r值
 46 
 47         int g = s + random.nextInt(e - s); //随机生成RGB颜色中的g值
 48 
 49         int b = s + random.nextInt(e - s); //随机生成RGB颜色中的b值
 50 
 51         return new Color(r, g, b);
 52 
 53     }
 54 
 55 
 56 
 57 
 58     public void service(HttpServletRequest request, HttpServletResponse response)
 59 
 60     throws ServletException, IOException {
 61 
 62         response.setHeader("Pragma", "No-cache");
 63 
 64         response.setHeader("Cache-Control", "No-cache");
 65 
 66         response.setDateHeader("Expires", 0);
 67 
 68 
 69         // 指定生成的响应是图片
 70 
 71         response.setContentType("image/jpeg");
 72 
 73         int width = 86;
 74 
 75         int height = 26;
 76 
 77         BufferedImage image = new BufferedImage(width, height,
 78 
 79                 BufferedImage.TYPE_INT_RGB);
 80 
 81         Graphics g = image.getGraphics();
 82 
 83         Graphics2D g2d = (Graphics2D) g;
 84 
 85         Random random = new Random();
 86 
 87         Font mFont = new Font("黑体", Font.BOLD, 17);
 88 
 89         g.setColor(getRandColor(200, 250));
 90 
 91         g.fillRect(0, 0, width, height);
 92 
 93         g.setFont(mFont);
 94 
 95         g.setColor(getRandColor(180, 200));
 96 
 97        
 98 
 99          // 画随机的线条
100 
101         for (int i = 0; i < 100; i++) {
102 
103             int x = random.nextInt(width - 1);
104 
105             int y = random.nextInt(height - 1);
106 
107             int x1 = random.nextInt(6) + 1;
108 
109             int y1 = random.nextInt(12) + 1;
110 
111             BasicStroke bs = new BasicStroke(2f, BasicStroke.CAP_BUTT,
112 
113                     BasicStroke.JOIN_BEVEL);
114 
115             Line2D line = new Line2D.Double(x, y, x + x1, y + y1);
116 
117             g2d.setStroke(bs);
118 
119             g2d.draw(line);
120 
121         }
122 
123         String sRand = "";
124 
125 
126 
127 
128         // 输出随机的验证文字
129 
130         String ctmp = "";
131 
132         int itmp = 0;
133 
134         for (int i = 0; i < 4; i++) {
135 
136             //random = new Random(new java.util.Date().getTime() + i);
137 
138             switch (random.nextInt(3)) {
139 
140             case 1:
141 
142                 itmp = random.nextInt(26) + 65; // 生成A~Z的字母
143 
144                 ctmp = String.valueOf((char) itmp);
145                 if (ctmp.equalsIgnoreCase("o")) {
146                     ctmp = "A";
147                 }
148 
149                 break;
150 
151             default:
152 
153                 itmp = random.nextInt(10) + 48; // 生成0~9的数字
154 
155                 ctmp = String.valueOf((char) itmp);
156                 if (ctmp.equalsIgnoreCase("0")) {
157                     ctmp = "1";
158                 }
159 
160                 break;
161 
162             }
163 
164             sRand += ctmp;
165 
166             Color color = new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110));
167 
168             g.setColor(color);
169 
170 
171 
172 
173             // 将文字旋转指定角度
174 
175             Graphics2D g2d_word = (Graphics2D) g;
176 
177             AffineTransform trans = new AffineTransform();
178 
179             trans.rotate(random.nextInt(45) * 3.14 / 180, 15 * i + 8, 7);
180 
181            
182 
183 
184          // 缩放文字
185 
186             float scaleSize = random.nextFloat() +0.8f;
187 
188             if (scaleSize > 1f) scaleSize = 1f;
189 
190             trans.scale(scaleSize, scaleSize);
191 
192             g2d_word.setTransform(trans);
193 
194             g.drawString(ctmp, 15 * i + 18, 14);
195         }
196 
197       
198 
199 
200       // 将生成的验证码保存到Session中
201 
202         HttpSession session = request.getSession(true);
203 
204         session.setAttribute("randCheckCode", sRand);
205 
206         g.dispose();
207         //System.out.println("randCheckCode:"+session.getAttribute("randCheckCode"));
208         
209         ImageIO.write(image, "JPEG", response.getOutputStream());
210 
211     }
212 
213 
214 }
215