Jsp Servlet 验证码

1、项目结构如下：图1package com.checkcode.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.util.Random;import java.awt.*;import java.awt.image.Buf

2、feredImage;import javax.imageio.ImageIO;import javax.servlet.http.HttpSession;public class AuthImage extends HttpServlet private static final String CONTENT_TYPE="text/html;charset=gb2312" private Font mFont=new Font("Times new Roman",Font.PLAIN,17);/Color getRandColor(int fc,int

3、 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);/private String getRandChar()int rand=(int)Math.round(Math.random()*2);long itmp=0; char ctmp='u0000'

4、switch(rand) case 1: itmp=Math.round(Math.random()*25+65); ctmp=(char)itmp; return String.valueOf(ctmp); case 2: itmp=Math.round(Math.random()*25+97); ctmp=(char)itmp; return String.valueOf(ctmp); default: itmp=Math.round(Math.random()*9); ctmp=(char)itmp; return String.valueOf(ctmp); /* * Construct

5、or of the object. */public AuthImage() super();/* * Destruction of the servlet. <br> */public void destroy() super.destroy(); / Just puts "destroy" string in log/ Put your code herepublic void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOE

6、xception response.setHeader("pragma","No-cache");response.setHeader("Cache-Control", "No-cashe");response.setHeader("Expires","0");/response.setContentType("image/jpeg");int width=80;int height=18;BufferedImage image=new BufferedI

7、mage(width,height,BufferedImage.TYPE_INT_RGB);Graphics g=image.getGraphics();Random random=new Random();g.setColor(getRandColor(200,500);g.fillRect(1, 1, width-1, height-1);g.setColor(new Color(102,102,102);g.drawRect(0, 0, width-1, height-1);g.setFont(mFont);/g.setColor(getRandColor(160,200);for(in

8、t i=0;i<155;i+)int x=random.nextInt(width-1);int y=random.nextInt(height-1);int x1=random.nextInt(6)+1;int y1=random.nextInt(12)+1;g.drawLine(x, y, x+x1, y+y1);/for(int i=0;i<70;i+)int x=random.nextInt(width-1);int y=random.nextInt(height-1);int x1=random.nextInt(12)+1;int y1=random.nextInt(6)

9、+1;g.drawLine(x, y, x-x1, y-y1);/String sRand =""for(int i=0;i<4;i+)String tmp=getRandChar();sRand+=tmp;/g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110);g.drawString(String.valueOf(tmp), 15*i+16, 16);HttpSession session=request.getSession(true);

10、session.setAttribute("ValidateCode", sRand);g.dispose();ImageIO.write(image, "JPEG", response.getOutputStream();public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException doGet(request,response);public void init() throws Servl

11、etException / Put your code herepackage com.checkcode.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CheckLogin extends HttpServlet

12、/* * Constructor of the object. */public CheckLogin() super();/* * Destruction of the servlet. <br> */public void destroy() super.destroy(); / Just puts "destroy" string in log/ Put your code herepublic void doGet(HttpServletRequest request, HttpServletResponse response)throws Servle

13、tException, IOException String validatecode1=(String)request.getSession().getAttribute("ValidateCode");/String validatecode2=request.getParameter("validatecode");/if(!validatecode1.equals(validatecode2)/request.setAttribute("message", "验证错误");elserequest.setAt

14、tribute("message", "验证正确");/request.getRequestDispatcher("/login.jsp").forward(request, response);public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException doGet(request,response); public void init() throws ServletE

15、xception / Put your code here配置文件：<servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>AuthImage</servlet-name> <servlet-class>com.che

16、ckcode.servlet.AuthImage</servlet-class> </servlet> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>CheckLogin</servlet-name&g

17、t; <servlet-class>com.checkcode.servlet.CheckLogin</servlet-class> </servlet> <servlet-mapping> <servlet-name>AuthImage</servlet-name> <url-pattern>/servlet/AuthImage</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Ch

18、eckLogin</servlet-name> <url-pattern>/servlet/CheckLogin</url-pattern> </servlet-mapping>登陆页面：<% page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme

19、()+":/"+request.getServerName()+":"+request.getServerPort()+path+"/"%><!DOCTYPE HTML PUBLIC "-/W3C/DTD HTML 4.01 Transitional/EN"><html> <head> <base href="<%=basePath%>"> <title>Login</title> </head>

20、; <body> <form name="logform" method="post" action="./servlet/CheckLogin"> <table align="center"> <tr> <td> 用户名:</td> <td> <input type="text" name="username" size="15"></td> </tr> <tr> <td> 密码:</td> <td>