我在网上找的图片验证码，我这个页面的值<input type="text">怎么传不到Servlet里面去,请高手瞧瞧
//产生图片servlet
package y.z.m;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;//产生图片servletpublic class VerifyCodeServlet extends HttpServlet { /** * 验证码图片的宽度。 */ private int width = 120; /** * 验证码图片的高度。 */ private int height = 30; /** * 验证码字符个数 */ private int codeCount = 5; /** * xx */ private int xx = 0; /** * 字体高度 */ private int fontHeight; /** * codeY */ private int codeY; /** * codeSequence */ char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; /** * 初始化验证图片属性 */ public void init() throws ServletException { // 从web.xml中获取初始信息 // 宽度 String strWidth = this.getInitParameter("width"); // 高度 String strHeight = this.getInitParameter("height"); // 字符个数 String strCodeCount = this.getInitParameter("codeCount"); // 将配置的信息转换成数值 try { if (strWidth != null && strWidth.length() != 0) { width = Integer.parseInt(strWidth); } if (strHeight != null && strHeight.length() != 0) { height = Integer.parseInt(strHeight); } if (strCodeCount != null && strCodeCount.length() != 0) { codeCount = Integer.parseInt(strCodeCount); } } catch (NumberFormatException e) { e.printStackTrace(); } xx = width / (codeCount + 1); fontHeight = height - 2; codeY = height - 4; } /** * @param req * @param resp * @throws ServletException * @throws java.io.IOException */ protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, java.io.IOException { // 定义图像buffer BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D gd = buffImg.createGraphics(); // 创建一个随机数生成器类 Random random = new Random(); // 将图像填充为白色 gd.setColor(Color.WHITE); gd.fillRect(0, 0, width, height); // 创建字体，字体的大小应该根据图片的高度来定。 Font font = new Font("Fixedsys", Font.PLAIN, fontHeight); // 设置字体。 gd.setFont(font); // 画边框。 gd.setColor(Color.BLACK); gd.drawRect(0, 0, width - 1, height - 1); // 随机产生160条干扰线，使图象中的认证码不易被其它程序探测到。 gd.setColor(Color.BLACK); for (int i = 0; i < 50; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); gd.drawLine(x, y, x + xl, y + yl); } // randomCode用于保存随机产生的验证码，以便用户登录后进行验证。 StringBuffer randomCode = new StringBuffer(); int red = 0, green = 0, blue = 0; // 随机产生codeCount数字的验证码。 for (int i = 0; i < codeCount; i++) { // 得到随机产生的验证码数字。 String strRand = String.valueOf(codeSequence[random.nextInt(36)]); // 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); // 用随机产生的颜色将验证码绘制到图像中。 gd.setColor(new Color(red, green, blue)); gd.drawString(strRand, (i + 1) * xx, codeY); // 将产生的四个随机数组合在一起。 randomCode.append(strRand); } // 将四位数字的验证码保存到Session中。 HttpSession session = req.getSession(); session.setAttribute("validateCode", randomCode.toString()); // 禁止图像缓存。 resp.setHeader("Pragma", "no-cache"); resp.setHeader("Cache-Control", "no-cache"); resp.setDateHeader("Expires", 0); resp.setContentType("image/jpeg"); // 将图像输出到Servlet输出流中。 ServletOutputStream sos = resp.getOutputStream(); ImageIO.write(buffImg, "jpeg", sos); sos.close(); }}
package y.z.m.action;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ResultServlet extends HttpServlet { public ResultServlet() { super(); } public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); //从session里面取出四位数字的验证码 String validateC = (String) request.getSession().getAttribute( "validateCode"); System.out.println(validateC); //从页面文本框输入的值 String veryCode = request.getParameter("veryCode"); System.out.println(veryCode); System.out.println("密码是"+request.getParameter("password")); if (veryCode == null || "".equals(veryCode)) { out.println("验证码为空"); } else { if (validateC.equals(veryCode)) { out.println("验证码正确"); } else { out.println("验证码错误"); } } out.flush(); out.close(); } public void init() throws ServletException { }}<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>ResultServlet</servlet-name> <servlet-class>y.z.m.action.ResultServlet</servlet-class> </servlet> <servlet> <servlet-name>VerifyCodeServlet</servlet-name> <servlet-class>y.z.m.VerifyCodeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ResultServlet</servlet-name> <url-pattern>/resultServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>VerifyCodeServlet</servlet-name> <url-pattern>/verifyCodeServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>verifyCode.jsp</welcome-file> </welcome-file-list></web-app>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script type="text/javascript" src="js/verifyCode.js"></script> <script type="text/javascript" src="js/jQuery.js"></script> <title>test verify code</title> </head> <body> <input id="veryCode" name="veryCode" type="text" value=""/> 密碼<input type="text" name="password" value="" /> <img id="imgObj" alt="" src="verifyCodeServlet" /> <a href="#" onclick="changeImg()">换一张</a> <input type="button" value="验证" onclick="isRightCode()" /> <div id="info"></div> </body></html>
function changeImg() { var imgSrc = $("#imgObj"); var src = imgSrc.attr("src"); imgSrc.attr("src", chgUrl(src));}//时间戳 //为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳 function chgUrl(url) { var timestamp = (new Date()).valueOf(); url = url.substring(0, 17); if ((url.indexOf("&") >= 0)) { url = url + "×tamp=" + timestamp; } else { url = url + "?timestamp=" + timestamp; } return url;}function isRightCode() { var code = $("#veryCode").attr("value"); code = "c=" + code; $.ajax( { type : "POST", url : "resultServlet", data : code, success : callback });}function callback(data) { $("#info").html(data);}