Servlet实现验证码图片（一）-白红宇

Servlet实现验证码图片（一）

阅读量：6981 次

发布时间：2019-06-27

本文共 13002 字，大约阅读时间需要 43 分钟。

Servlet实现数字字母验证码图片（一）：

生成验证码图片主要用到了一个BufferedImage类，如下：

1、引入jquery-1.10.2.js文件，创建verifyCode.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2  3  4  5  6 Java验证码 7  8  9 10     
     
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                             验证码：                         看不清，换一张                
                              
      
     
27 28 29 65

2.创建画图servlet，DrawImage.java

1 package com.utils;  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.util.Random; 10  11 import javax.imageio.ImageIO; 12 import javax.servlet.ServletException; 13 import javax.servlet.annotation.WebServlet; 14 import javax.servlet.http.HttpServlet; 15 import javax.servlet.http.HttpServletRequest; 16 import javax.servlet.http.HttpServletResponse; 17  18 /** 19  * 生成随机验证码图片 20  *  21  * @author huang 22  *  23  */ 24 @WebServlet("/DrawImage") 25 public class DrawImage extends HttpServlet { 26     private static final long serialVersionUID = 1L; 27     public static final int WIDTH = 120; 28     public static final int HEIGHT = 30; 29  30     // 在报java.lang.NoClassDefFoundError: Could not initialize class 31     // javax.imageio.ImageIO错的时候加上这个很管用。 32     static { 33         ImageIO.scanForPlugins(); 34     } 35  36     public void doGet(HttpServletRequest request, HttpServletResponse response) 37             throws ServletException, IOException { 38         this.doPost(request, response); 39     } 40  41     public void doPost(HttpServletRequest request, HttpServletResponse response) 42             throws ServletException, IOException { 43         request.setCharacterEncoding("utf-8"); 44         response.setContentType("text/html;charset=utf-8"); 45         // 创建缓存 46         BufferedImage bi = new BufferedImage(WIDTH, HEIGHT, 47                 BufferedImage.TYPE_INT_RGB); 48         // 获得画布 49         Graphics g = bi.getGraphics(); 50         // 设置背影色 51         setBackGround(g); 52         // 设置边框 53         setBorder(g); 54         // 画干扰线 55         drawRandomLine(g); 56         // 写随机数 57         String random = drawRandomNum((Graphics2D) g); 58         // 将随机汉字存在session中 59         request.getSession().setAttribute("checkcode", random); 60         // 将图形写给浏览器 61         response.setContentType("image/jpeg"); 62         // 发头控制浏览器不要缓存 63         response.setDateHeader("expries", -1); 64         response.setHeader("Cache-Control", "no-cache"); 65         response.setHeader("Pragma", "no-cache"); 66         // 将图片写给浏览器 67         ImageIO.write(bi, "jpg", response.getOutputStream()); 68     } 69  70     /** 71      * 设置背景色 72      *  73      * @param g 74      */ 75     private void setBackGround(Graphics g) { 76         // 设置颜色 77         g.setColor(new Color(249, 249, 249)); 78         // 填充区域 79         g.fillRect(0, 0, WIDTH, HEIGHT); 80  81     } 82  83     /** 84      * 设置边框 85      *  86      * @param g 87      */ 88     private void setBorder(Graphics g) { 89         // 设置边框颜色 90         // RGB 91         g.setColor(new Color(210, 209, 205)); 92         // 边框区域 93         g.drawRect(1, 1, WIDTH - 2, HEIGHT - 2); 94     } 95  96     /** 97      * 画随机线条 98      *  99      * @param g100      */101     private void drawRandomLine(Graphics g) {102         // 设置颜色103         g.setColor(Color.GRAY);104         // 设置线条个数并画线105         for (int i = 0; i < 5; i++) {106             int x1 = new Random().nextInt(WIDTH);107             int y1 = new Random().nextInt(HEIGHT);108             int x2 = new Random().nextInt(WIDTH);109             int y2 = new Random().nextInt(HEIGHT);110             g.drawLine(x1, y1, x2, y2);111         }112     }113 114     /**115      * 画随机汉字116      * 117      * @param g118      * @return119      */120     private String drawRandomNum(Graphics2D g) {121         StringBuffer sb = new StringBuffer();122         // 设置字体123         g.setFont(new Font("宋体", Font.BOLD, 20));124         // 准备常用汉字集125         // String base =126         // "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";127         // String base =128         // "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";129         // 准备常用字符集130         String base = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";131         int x = 5;132         // 控制字数133         for (int i = 0; i < 4; i++) {134             // 生成0-255的随机数135             int R = new Random().nextInt(256);136             int G = new Random().nextInt(256);137             int B = new Random().nextInt(256);138             // 设置每个随机数的颜色139             g.setColor(new Color(R, G, B));140             // 设置字体旋转角度141             int degree = new Random().nextInt() % 30;142             // 截取汉字143             String ch = base.charAt(new Random().nextInt(base.length())) + "";144             sb.append(ch);145             // 正向角度146             g.rotate(degree * Math.PI / 180, x, 20);147             g.drawString(ch, x, 20);148             // 反向角度149             g.rotate(-degree * Math.PI / 180, x, 20);150             x += 30;151         }152         return sb.toString();153     }154 }

3.创建验证结果servlet，ResultServlet.java

1 package com.utils; 2  3 import java.io.IOException;   4 import java.io.PrintWriter;   5    6  7 import javax.servlet.ServletException;   8 import javax.servlet.annotation.WebServlet; 9 import javax.servlet.http.HttpServlet;  10 import javax.servlet.http.HttpServletRequest;  11 import javax.servlet.http.HttpServletResponse;  12   13 /** 14  * 结果验证Servlet 15  * @author huang 16  * 17  */  18 @WebServlet("/resultServlet")19 public class ResultServlet extends HttpServlet {  20   21     /** 22      *  23      */  24     private static final long serialVersionUID = 1L;  25   26     public void doGet(HttpServletRequest request, HttpServletResponse response)  27             throws ServletException, IOException {  28   29         doPost(request, response);  30     }  31   32     /**   33      * 后台验证输入 34      */  35     public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  36         response.setContentType("text/html;charset=utf-8");  37         String validateC = (String) request.getSession().getAttribute("checkcode");  38         //从前台传来的用户输入的验证码  39         String veryCode = request.getParameter("c");  40         System.out.println("veryCode:"+veryCode);41         PrintWriter out = response.getWriter();  42         if (veryCode == null || "".equals(veryCode)) {  43             out.println("请输入验证码！");  44         } else {  45 //          if (validateC.equals(veryCode)) {  46             // 忽略大小写处理：47             if (validateC.equalsIgnoreCase(veryCode)) {  48                 out.println(1);  49             } else {  50                 out.println("验证码输入错误！");  51             }  52         }  53         out.flush();  54         out.close();  55     }  56   57 }

4、结果