jsp页面生成<注册验证码>

1 生成验证码图片类

  1 package com.keertech.util;
  2 
  3 import java.awt.Color;
  4 import java.awt.Font;
  5 import java.awt.Graphics;
  6 import java.awt.image.BufferedImage;
  7 import java.io.ByteArrayInputStream;
  8 import java.io.ByteArrayOutputStream;
  9 import java.io.IOException;
 10 import java.util.Random;
 11 import javax.imageio.ImageIO;
 12 import javax.imageio.stream.ImageOutputStream;
 13 import javax.servlet.ServletException;
 14 import javax.servlet.http.HttpServlet;
 15 import javax.servlet.http.HttpServletRequest;
 16 import javax.servlet.http.HttpServletResponse;
 17 
 18 /**
 19  * generate validate image
 20  * @author kunbao li
 21  * @date 2010-03-08
 22  */
 23 public class VImage extends HttpServlet {
 24     /**
 25      * serialVersionUID
 26      */
 27     private static final long serialVersionUID = 1L;
 28     
 29     private ByteArrayInputStream image;
 30 
 31     public ByteArrayInputStream getImage() {
 32         return image;
 33     }
 34 
 35     public void setImage(ByteArrayInputStream image) {
 36         this.image = image;
 37     }
 38 
 39     Color getRandColor(int fc, int bc) {// 给定范围得到随机颜色
 40         Random random = new Random();
 41         if (fc > 255)
 42             fc = 255;
 43         if (bc > 255)
 44             bc = 255;
 45         int r = fc + random.nextInt(bc - fc);
 46         int g = fc + random.nextInt(bc - fc);
 47         int b = fc + random.nextInt(bc - fc);
 48         return new Color(r, g, b);
 49     }
 50 
 51     public void doGet(HttpServletRequest request, HttpServletResponse response)
 52             throws ServletException, IOException {
 53 
 54         // 设置页面不缓存
 55 
 56         response.setHeader("Pragma", "No-cache");
 57         response.setHeader("Cache-Control", "no-cache");
 58         response.setDateHeader("Expires", 0);
 59 
 60         // 在内存中建立图象
 61         int width = 60, height = 20;
 62         BufferedImage image = new BufferedImage(width, height,
 63                 BufferedImage.TYPE_INT_RGB);
 64 
 65         // 获取图形上下文
 66 
 67         Graphics g = image.getGraphics();
 68 
 69         // 生成随机类
 70 
 71         Random random = new Random();
 72 
 73         // 设定背景色
 74 
 75         g.setColor(getRandColor(200, 250));
 76         g.fillRect(0, 0, width, height);
 77 
 78         // 设定字体
 79         g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
 80 
 81         // 画边框
 82 
 83         // g.setColor(new Color());
 84         // g.drawRect(0,0,width-1,height-1);
 85 
 86         // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
 87 
 88         g.setColor(getRandColor(160, 200));
 89         for (int i = 0; i < 155; i++) {
 90             int x = random.nextInt(width);
 91             int y = random.nextInt(height);
 92             int xl = random.nextInt(12);
 93             int yl = random.nextInt(12);
 94             g.drawLine(x, y, x + xl, y + yl);
 95         }
 96 
 97         // 取随机产生的认证码(4位数字)
 98         String sRand = "";
 99         for (int i = 0; i < 4; i++) {
100             String rand = String.valueOf(random.nextInt(10));
101             sRand += rand;
102             // 将认证码显示到图象中
103             g.setColor(new Color(20 + random.nextInt(110), 20 + random
104                     .nextInt(110), 20 + random.nextInt(110)));// 调用函数出来的颜色相同，多是由于种子太接近，因此只能直接生成
105 
106             g.drawString(rand, 13 * i + 6, 16);
107         }
108 
109         //将认证码存入SESSION
110         request.getSession().setAttribute("rand", sRand);
111 
112         // 图象生效
113         g.dispose();
114         
115         ByteArrayInputStream input = null;
116         ByteArrayOutputStream output = new ByteArrayOutputStream();
117         try {
118             ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
119             // 输出图象到页面
120 
121             ImageIO.write(image, "JPEG", imageOut);
122             imageOut.close();
123             input = new ByteArrayInputStream(output.toByteArray());
124         } catch (Exception e) {
125             //not handle
126         }
127 
128         this.image = input;
129     }
130 }

2 验证码图片action

 1 package com.keertech.web.action;
 2 
 3 import java.io.ByteArrayInputStream;
 4 import java.io.IOException;
 5 import javax.servlet.ServletException;
 6 import org.apache.log4j.Logger;
 7 import org.apache.struts2.ServletActionContext;
 8 
 9 import com.keertech.base.action.AbstractAction;
10 import com.keertech.util.VImage;
11 
12 
13 public class ImageAction extends AbstractAction {
14     /**
15      * serialVersionUID
16      */
17     private static final long serialVersionUID = 1L;
18     
19     /**
20      * log
21      */
22     private Logger log = Logger.getLogger(this.getClass().getName());
23     
24     private ByteArrayInputStream inputStream;  
25 
26     public String getValCode(){
27         VImage v=new VImage();
28         try {
29             v.doGet(ServletActionContext.getRequest(), ServletActionContext.getResponse());
30             this.setInputStream(v.getImage());
31         } catch (ServletException e) {
32             log.info(e.getMessage());
33         } catch (IOException e) {
34             log.info(e.getMessage());
35         }
36         
37         return SUCCESS;
38     }
39     
40     public ByteArrayInputStream getInputStream() {
41         return inputStream;
42     }
43     
44     public void setInputStream(ByteArrayInputStream inputStream) {
45         this.inputStream = inputStream;
46     }
47 }

3 struts配置aciton

1 <action name="rand" class="com.keertech.web.action.ImageAction"
2             method="getValCode">
3             <result type="stream">
4                 <param name="contentType">image/jpeg</param>
5                 <param name="inputName">inputStream</param>
6             </result>
7         </action>

4 javascript访问验证码生成action

1 function changeValidateCode(obj) {
2             var myDate = new Date();
3             obj.src = "webbase/rand.action?date=" + myDate;
4         }

5 html

1 <img style="display: block;float: left;cursor:hand;" src="rand.action" id="valImg" onclick="changeValidateCode(this)" title="更换验证码" />

6 接收数据action中核对验证码是否正确

 1 Boolean valided = true;
 2         
 3         if (valided){
 4             if (valCode == null || valCode.equals("") || valCode.trim().equals("")) {
 5                 response(String.format("{\"success\":false,\"message\":\"%s\"}","验证码不能为空"));
 6                 valided = Boolean.FALSE;
 7             }
 8             else {
 9                 String tmp = (String) request.getSession().getAttribute("rand");
10                 if (!valCode.equalsIgnoreCase(tmp)) {
11                     response(String.format("{\"success\":false,\"message\":\"%s\"}","验证码错误"));
12                     valided = Boolean.FALSE;
13                 }
14             }
15         }

7 javascript提交

 1 var param = 'name=' + name +                    
 2                     '&regMail=' + regMail + 
 3                     '&contacter=' + contacter + 
 4                     '&cellPhone=' + cellPhone + 
 5                     '&valCode=' + valCode;
 6             $.post('enterpriseManage!registerEnterprise.action', param, function(result) {
 7                 if (result.success) {
 8                     //$('#pu_msg').html("您好，欢迎注册八鸽快消通软件。请登陆到您的注册邮箱激活您的帐号。");    
 9                 } else {
10                     /*
11                     $('#pu_msg').html(result.message);
12                     $('#pu_loginName').select();
13                     */
14                     alert("验证码有误，请从新填写");
15                     var valImg = document.getElementById("valImg");
16                     changeValidateCode(valImg);
17                 }
18             }, "json");