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) {// 给定范围获得随机颜色 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 // 在内存中创建图象 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，可能是因为种子太接近，所以只能直接生成 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 '®Mail=' + 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。请登录到您的注册邮箱激活您的账号。"); 9 } else { 10 /* 11 $('#pu_msg').html(result.message); 12 $('#pu_loginName').select(); 13 */ 14 alert("验证码有误，请重新填写"); 15 var valImg = document.getElementById("valImg"); 16 changeValidateCode(valImg); 17 } 18 }, "json");
