为什么按照教程写的一样不能显示验证码？是哪里错了吗？//index.jsp<%@ page language="java" import="java.util.*" pageEncoding="gbk"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html> <head> <script type="text/javascript">function reloadCode(){var time=new Date().getTime();document.getElementById("imagecode").src="<%=request.getContextPath() %>/servlet/ImgeServlet?d="+time;}</script> </head> <body> 验证码：<input type="text" name="checkcode"> <img alt="验证码" id="imagecode" src="<%=request.getContextPath() %>/servlet/ImgeServlet"/> <a href="javascript:reloadCode();">看不清 </a> <br> </body></html> //ImageServlet.javapackage com.muke;import java.awt.Color;import java.awt.color.*;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ImageServlet extends HttpServlet{public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{BufferedImage bi = new BufferedImage(80, 22, BufferedImage.TYPE_INT_RGB);//画一个图片Graphics g=bi.getGraphics();Color c=new Color(200,150,255);g.setColor(c);g.fillRect(0, 0, 80, 22);//背景图片内容char[] ch="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();//随机获取四个字符Random r=new Random();int len=ch.length,index;//定义一个StringBuffer sb=new StringBuffer();for(int i=0;i<4;i++){index=r.nextInt(len);//随机颜色g.setColor(new Color(r.nextInt(88),r.nextInt(188),r.nextInt(255)));//将字符画到图片上g.drawString(ch[index]+"", (i*15)+3, 18);//将字符保存起来sb.append(ch[index]);}//将字符保存在request.getSession().setAttribute("piccode", sb.toString());//进行输出ImageIO.write(bi,"JPG",response.getOutputStream()); }}//web.xml<?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>ImageServlet</servlet-name> <servlet-class>com.muke.ImageServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ImageServlet</servlet-name> <url-pattern>/servlet/ImageServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <login-config> <auth-method>BASIC</auth-method> </login-config></web-app>
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