JSP验证码系列（数字验证码、英文与数字混合验证码、中文验证码、表达式验证码）
一、数字验证码：
1.编写产生验证码的页面,image.jsp
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%> <%@ page import="java.io.OutputStream"%> <%!Color getRandColor(int fc, int bc) { Random random = new Random(); if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); }%> <% try { response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); int width = 60, height = 20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); OutputStream os = response.getOutputStream(); Graphics g = image.getGraphics(); Random random = new Random(); g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, width, height); g.setFont(new Font("Times New Roman", Font.PLAIN, 18)); g.setColor(getRandColor(160, 200)); for (int i = 0; i < 155; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); g.drawLine(x, y, x + xl, y + yl); } String sRand = ""; for (int i = 0; i < 4; i++) { String rand = String.valueOf(random.nextInt(10)); sRand += rand; g.setColor(new Color(20 + random.nextInt(110), 20 + random .nextInt(110), 20 + random.nextInt(110))); g.drawString(rand, 13 * i +4, 16); } session.setAttribute("rand", sRand); g.dispose(); ImageIO.write(image, "JPEG", os); os.flush(); os.close(); os = null; response.flushBuffer(); out.clear(); out = pageContext.pushBody(); } catch (IllegalStateException e) { System.out.println(e.getMessage()); e.printStackTrace(); } %>
2.编写放置验证码的页面,使用javascript加载验证码图片：login.jsp
<%@ page contentType="text/html;charset=gb2312"%> <%@ page language="java" import="java.sql.*" errorPage=""%> <html <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>用户登录</title> <mce:script language="javascript"><!-- //加载验证码图片 function loadimage() { document.getElementById("randImage").src = "image.jsp?" + Math.random(); } // --></mce:script> </head> <body> <table width="256" border="0" cellpadding="0" cellspacing="0"> <!--DWLayoutTable--> <form action="validate.jsp" method="post" name="loginForm"> <tr> <td width="118" height="22" valign="middle" align="center"> <input type="text" name="rand" size="15"> </td> <td width="138" valign="middle" align="center"> <img alt="code..." name="randImage" id="randImage" src="numimg.jsp" width="60" height="20" border="1" align="absmiddle"> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <a href="javascript:loadimage();" mce_href="javascript:loadimage();"><font class=pt95>看不清点我</font> </a> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <input type="submit" name="login" value="提交"> </td> </tr> </form> </table> </body> </html>
注意：src="numing.jsp"
<img alt="code..." name="randImage" id="randImage" src="numimg.jsp"
width="60" height="20" border="1" align="absmiddle">
3、测试效果：
二、英文与数字验证码
1、编写产生验证码的页面：ening.jsp
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%> <%@ page import="java.io.OutputStream"%> <%!Color getRandColor(int fc, int bc) { Random random = new Random(); if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); }%> <% try { response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); int width = 110, height = 20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); OutputStream os = response.getOutputStream(); Graphics g = image.getGraphics(); Random random = new Random(); g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, width, height); g.setFont(new Font("Times New Roman", Font.PLAIN, 18)); g.setColor(getRandColor(160, 200)); for (int i = 0; i < 155; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); g.drawLine(x, y, x + xl, y + yl); } String[] s = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" }; String sRand = ""; for (int i = 0; i < 4; i++) { String rand = ""; if (random.nextBoolean()) { rand = String.valueOf(random.nextInt(10)); } else { int index = random.nextInt(25); rand = s[index]; } sRand += rand; g.setColor(new Color(20 + random.nextInt(10), 20 + random .nextInt(110), 20 + random.nextInt(110))); g.drawString(rand, 17 * i + 6, 16); } session.setAttribute("rand", sRand); g.dispose(); ImageIO.write(image, "JPEG", os); os.flush(); os.close(); os = null; response.flushBuffer(); out.clear(); out = pageContext.pushBody(); } catch (IllegalStateException e) { System.out.println(e.getMessage()); e.printStackTrace(); } %>
2.编写放置验证码的页面,使用javascript加载验证码图片：login.jsp
<%@ page contentType="text/html;charset=gb2312"%> <%@ page language="java" import="java.sql.*" errorPage=""%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>用户登录</title> <mce:script language="javascript"><!-- function loadimage(){ document.getElementById("randImage").src = "enimg.jsp?"+Math.random(); } // --></mce:script> </head> <body> <table width="256" border="0" cellpadding="0" cellspacing="0"> <!--DWLayoutTable--> <form action="validate.jsp" method="post" name="loginForm"> <tr> <td width="118" height="22" valign="middle" align="center"> <input type="text" name="rand" size="15"> </td> <td width="138" valign="middle" align="center"> <img alt="code..." name="randImage" id="randImage" src="enimg.jsp" mce_src="enimg.jsp" width="60" height="20" border="1" align="absmiddle"> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <a href="javascript:loadimage();" mce_href="javascript:loadimage();"><font class=pt95>看不清点我</font> </a> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <input type="submit" name="login" value="提交"> </td> </tr> </form> </table> </body> </html>
注意：src="ening.jsp"
<img alt="code..." name="randImage" id="randImage" src="enimg.jsp"
width="60" height="20" border="1" align="absmiddle">
3.测试效果：
三、JSP中文版验证码：
1.编写产生验证码的页面：cimg
<%@page contentType="image/jpeg" pageEncoding="UTF-8" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%> <%!//生成随机颜色 Color getRandColor(Random random, int fc, int bc) { if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); }%> <% //设置页面不缓存 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); // 设置图片的长宽 int width = 106, height = 30; //设置备选汉字，剔除一些不雅的汉字 String base = "/u6211/u662f/u5f90/u5f20/u660e/u71d5/u534e/u541b/u5c24/u6731/u7ea2/u7231/u4f20/u534e/u6768/u5510/u536b/u5b8f/u950b/u5f20/u4e2d/u56fd/u5317/u4eac/u4e0a/u6d77/u5929/u6d25/u6e56/u5317"; //备选汉字的长度 int length = base.length(); //创建内存图像 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 获取图形上下文 Graphics g = image.getGraphics(); //创建随机类的实例 Random random = new Random(); // 设定图像背景色(因为是做背景，所以偏淡) g.setColor(getRandColor(random, 200, 250)); g.fillRect(0, 0, width, height); //备选字体 String[] fontTypes = { "u5b8bu4f53", "u65b0u5b8bu4f53", "u9ed1u4f53", "u6977u4f53", "u96b6u4e66" }; int fontTypesLength = fontTypes.length; //在图片背景上增加噪点 g.setColor(getRandColor(random, 160, 200)); g.setFont(new Font("Times New Roman", Font.PLAIN, 14)); for (int i = 0; i < 6; i++) { g.drawString("*********************************************", 0, 5 * (i + 2)); } //取随机产生的认证码(6个汉字) //保存生成的汉字字符串 String sRand = ""; for (int i = 0; i < 3; i++) { int start = random.nextInt(length); String rand = base.substring(start, start + 1); sRand += rand; //设置字体的颜色 g.setColor(getRandColor(random, 10, 150)); //设置字体 g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)], Font.BOLD, 18 + random.nextInt(6))); //将此汉字画到图片上 g.drawString(rand, 24 * i + 10 + random.nextInt(8), 24); } //将认证码存入session session.setAttribute("rand", sRand); g.dispose(); //输出图象到页面 out.clear(); out = pageContext.pushBody(); ImageIO.write(image, "JPEG", response.getOutputStream()); %>
2.编写放置验证码的页面,使用javascript加载验证码图片：login.jsp
<%@ page contentType="text/html;charset=gb2312"%> <%@ page language="java" import="java.sql.*" errorPage=""%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>用户登录</title> <mce:script language="javascript"><!-- function loadimage(){ document.getElementById("randImage").src = "cimg.jsp?"+Math.random(); } // --></mce:script> </head> <body> <table width="256" border="0" cellpadding="0" cellspacing="0"> <!--DWLayoutTable--> <form action="validate.jsp" method="post" name="loginForm"> <tr> <td width="118" height="22" valign="middle" align="center"> <input type="text" name="rand" size="15"> </td> <td width="138" valign="middle" align="center"> <img alt="code..." name="randImage" id="randImage" src="cimg.jsp" mce_src="cimg.jsp" width="60" height="20" border="1" align="absmiddle"> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <a href="javascript:loadimage();" mce_href="javascript:loadimage();"><font class=pt95>看不清点我</font> </a> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <input type="submit" name="login" value="提交"> </td> </tr> </form> </table> </body> </html>
注意：src="cimg.jsp"
<img alt="code..." name="randImage" id="randImage" src="cimg.jsp"
width="60" height="20" border="1" align="absmiddle">
3.测试效果：
四、JSP版表达式验证码
1.编写产生验证码的界面：
<%@ page contentType="text/html;charset=gb2312"%> <%@ page language="java" import="java.sql.*" errorPage=""%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>用户登录</title> <mce:script language="javascript"><!-- function loadimage(){ document.getElementById("randImage").src = "numimg.jsp?"+Math.random(); } // --></mce:script> </head> <body> <table width="256" border="0" cellpadding="0" cellspacing="0"> <!--DWLayoutTable--> <form action="validate.jsp" method="post" name="loginForm"> <tr> <td width="118" height="22" valign="middle" align="center"> <input type="text" name="rand" size="15"> </td> <td width="138" valign="middle" align="center"> <img alt="code..." name="randImage" id="randImage" src="numimg.jsp" mce_src="numimg.jsp" width="60" height="20" border="1" align="absmiddle"> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <a href="javascript:loadimage();" mce_href="javascript:loadimage();"><font class=pt95>看不清点我</font> </a> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <input type="submit" name="login" value="提交"> </td> </tr> </form> </table> </body> </html>
2.编写放置验证码的页面,使用javascript加载验证码图片：login.jsp
<%@ page contentType="text/html;charset=gb2312"%> <%@ page language="java" import="java.sql.*" errorPage=""%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>用户登录</title> <mce:script language="javascript"><!-- function loadimage(){ document.getElementById("randImage").src = "numimg.jsp?"+Math.random(); } // --></mce:script> </head> <body> <table width="256" border="0" cellpadding="0" cellspacing="0"> <!--DWLayoutTable--> <form action="validate.jsp" method="post" name="loginForm"> <tr> <td width="118" height="22" valign="middle" align="center"> <input type="text" name="rand" size="15"> </td> <td width="138" valign="middle" align="center"> <img alt="code..." name="randImage" id="randImage" src="numimg.jsp" mce_src="numimg.jsp" width="60" height="20" border="1" align="absmiddle"> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <a href="javascript:loadimage();" mce_href="javascript:loadimage();"><font class=pt95>看不清点我</font> </a> </td> </tr> <tr> <td height="36" colspan="2" align="center" valign="middle"> <input type="submit" name="login" value="提交"> </td> </tr> </form> </table> </body> </html>
注意：src="numimg.jsp"
<img alt="code..." name="randImage" id="randImage" src="numimg.jsp"
width="60" height="20" border="1" align="absmiddle">
3.测试效果：
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