驗證碼不顯示
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
? <head>
? ? <base href="<%=basePath%>">
? ??
? ? <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> ? ?
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
? </head>
??
? <body>
驗證碼：<input type="text" name = "checkcode"/>
? ? ? ? ? ? ?<img alt="驗證碼" ? ?src="<%= request.getContextPath();%>/servlet/ImageServlet"/>
? ? ? ? ? ? ?<<a href="javascript:reloadCode();">看不清楚</a><br>
? </body>
</html>
package com.Servlet;
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.imageio.spi.ImageWriterSpi;
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){
BufferedImage bi = new BufferedImage(68, 26,BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
Color c = new Color(200, 150, 255);
g.setColor(c);
g.fillRect(0, 0, 68, 26);
char[] ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789".toCharArray();
Random r = new Random();
int len = ch.length,index;
StringBuffer sb = new StringBuffer();
for (int i = 0; i <4; i++) {
index = r.nextInt(len);
g.setColor(new Color(r.nextInt(88),r.nextInt(188),r.nextInt(255)));
g.drawString(ch[index]+" ", (i*15)+3,18 );
sb.append(ch[index]);
}
request.getSession().setAttribute("piccode",sb.toString() );
try {
ImageIO.write(bi, "JPG", response.getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
2016-10-18
選擇創(chuàng)建Servlet類 ，不要自己手敲，他會自動生成web配置? 把那個訪問servlet的路徑直接復制在JSP頁面上
2016-10-15
貌似是imagecodeservlet那個servlet根本沒有執(zhí)行，我也遇到一樣的問題了，還沒有解決，樓主有解了不?
2016-10-14
web.xml里的字母大小寫問題。找出來原因了
2016-10-14
圖片地址中的?src="<%= request.getContextPath();%>/servlet/ImageServlet"去掉里面的分號再試試
2016-10-14
你的Web.xml文件配置了嗎？貼出來看看