Struts学习笔记5——验证码
图片验证功能1 创建3 个jsp 页面
tplogin.jsp
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title></head><body><form id="form1" name="form1" method="post" action="tp.do"><p>用户名: <label> <input name="username" type="text" id="username" /> </label></p><p>密码: <label> <input name="password" type="text" id="password" /> </label></p><p>验证码; <label> <input name="tupian" type="text" id="tupian" /> </label><td><img src="image1.jsp"/>&nbsp; <a href="tplogin.jsp">换一格${requestScope.tupian}</a></td></p><p> <label> <input type="submit" name="Submit" value="提交" /> </label></p></form></body></html>
说明：所要注意的是<form id="form1" name="form1" method="post" action=" tp.do ">
<td>验证码
<input name="tupian" type="text" id="tupian" />
<img src="image1.jsp">&nbsp;<a href="tplogin.jsp">换一格${requestScope.tupian}</a></td>
</tr>
<tr>
<td>
Image1.jsp
<%@page contentType="image/jpeg; charset=gb2312" %><jsp:useBean id="image" class="dao.ImageEnsure" />adc<%String str=image.getEnsure(0,0,response.getOutputStream());//取得真正的验证码信息session.setAttribute("tupian", str); //将这个真正的验证码信息保存在一个对象当中。以便日后核对%>
说明：session.setAttribute("tupian", str) 中的tupian 对应的是
<tr>
<td>验证码
<input name="tupian" type="text" id="tupian" />
<img src="image1.jsp">&nbsp; <a href=" tplogin.jsp ">换一格</a></td>
</tr>
的tupian
<jsp:useBean id="image" class="dao.ImageEnsure" />
这个是引用一个类生成验证码的图片，对应的是dao包里面的ImageEnsure 这个类
Ok.jsp
ok恭喜你验证成功了
ImageEnsure 类
package dao;import java.io.*;import java.util.*;import javax.imageio.*;import java.awt.*;import java.awt.image.*;import javax.imageio.ImageIO;public class ImageEnsure {public ImageEnsure() {}private char mapTable[] = { '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' };// 这是一个数据字典，验证码当中的信息都是来自这个数组public String getEnsure(int width, int height, OutputStream os) {if (width <= 0)width = 100;if (height <= 0)height = 50;BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);// 获取图形上下文Graphics g = image.getGraphics();// 设定背景色g.setColor(new Color(0xCCCCFF));g.fillRect(0, 0, width, height); // 用刚才的颜色填充矩形（开始x坐标，开始y坐标，终止x坐标，终止y坐标）// 画边框g.setColor(Color.black); // 更改颜色g.drawRect(0, 0, width - 1, height - 1); // 画个框// 取随机产生的认证码String strEnsure = "";// 4代表4位验证码for (int i = 0; i < 4; ++i) {strEnsure += mapTable[(int) (mapTable.length * Math.random())];}// 将认证码显示到图象中g.setColor(Color.black);g.setFont(new Font("Atlantic Inline", Font.PLAIN, 18)); // 18表示字号String str = strEnsure.substring(0, 1);g.drawString(str, 8, 15);str = strEnsure.substring(1, 2);g.drawString(str, 20, 17);str = strEnsure.substring(2, 3);g.drawString(str, 35, 15);str = strEnsure.substring(3, 4);g.drawString(str, 45, 17);// 随机产生30个干扰点Random rand = new Random();for (int i = 0; i < 30; i++) {int x = rand.nextInt(width);int y = rand.nextInt(height);g.drawOval(x, y, 1, 1);}// 释放图形上下文g.dispose();try {// 输出图象到页面ImageIO.write(image, "JPEG", os);} catch (IOException e) {return "";}return strEnsure;} /* public static void main(String []args) { try{ BufferedOutputStream os =new BufferedOutputStream( new FileOutputStream("c:\\test.jpg")); new ImageEnsure().getEnsure(100, 200, os); os.flush(); os.close(); } catch(Exception e) {} } */}
1个action
package action;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;public class TpAction extends Action {public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) {String tupian=request.getParameter("tupian");HttpSession session=request.getSession();String a=(String)session.getAttribute("tupian");if(!(request.getSession().getAttribute("tupian").equals(tupian))){request.setAttribute("tupian","验证码错误");return mapping.findForward("nook");}String username=request.getParameter("username");String password=request.getParameter("password");if(username.equals("11")&&password.equals("11")){session.setAttribute("username", username);session.setAttribute("log","ok");return mapping.findForward("ok");}return mapping.findForward("nook");}}
Struts-config.xml 文件
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"><struts-config><data-sources /><form-beans /><global-exceptions /><global-forwards /><action-mappings > <action path="/tp" type="action.TpAction"> <forward name="ok" path="/ok.jsp" /> <forward name="nook" path="/tplogin.jsp" /> </action></action-mappings><message-resources parameter="com.yourcompany.struts.ApplicationResources" /></struts-config>
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