jsp验证码一些使用
发布时间：2023-07-21 14:01:39 所属栏目：教程 来源：
导读：jsp验证码使用
yanzhe,jsp
<%@ page autoFlush="false" import="java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%>
<%@ page import="org.apache.commons.lang.RandomStringUtils
yanzhe,jsp
<%@ page autoFlush="false" import="java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%>
<%@ page import="org.apache.commons.lang.RandomStringUtils
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jsp验证码使用 yanzhe,jsp <%@ page autoFlush="false" import="java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%> <%@ page import="org.apache.commons.lang.RandomStringUtils"%> <% RandomStringUtils rs=new RandomStringUtils(); String random=rs.randomAlphanumeric(4); session.setAttribute("random",random); %> <% out.clear(); response.setContentType("image/jpeg"); response.addHeader("pragma","NO-cache"); response.addHeader("Cache-Control","no-cache"); response.addDateHeader("Expries",0); int width=38, height=12; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); //以下填充背景颜色 g.setColor(Color.WHITE); g.fillRect(0, 0, width, height); //设置字体颜色 g.setColor(Color.RED); g.drawString(random,3,10); g.dispose(); ServletOutputStream outStream = response.getOutputStream(); JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(outStream); encoder.encode(image); outStream.close(); %> 使用Login.jsp <%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %> <!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=gb2312"> <META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="0"> <title>网站管理系统--宁波中小在线</title> <style type="text/css"> <!-- body { background-color: #FFFFFF; margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; } body,td,th { font-size: 12px; color: #000000; } --> </style> <link href="img/main.css" rel="stylesheet" type="text/css"> </head> <script language="javascript"> function check(){ if(myform.username.value==""){ alert("请输入用户名！"); return false; } if(myform.password.value==""){ alert("请输入密码！"); return false; } return true; } </script> <body> <table border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td width="750" height="461" valign="top" background="img/admin.jpg"><table width="719" height="366" border="0" cellpadding="0" cellspacing="0"> <tr> <td width="515" height="145"> </td> <td width="158"> </td> <td width="46"> </td> </tr> <tr> <td height="67"> </td> <td><img src="img/1.jpg" width="158" height="89"></td> <td> </td> </tr> <tr> <td height="132"> </td> <td> <form action="admin_do.jsp" method="post" name="myform"> <table width="100%" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td width="32%" height="25">用户名：</td> <td width="68%"><span class="pos_service"> <INPUT class=biaoge3 id=username maxLength=24 name=username> </span></td> </tr> <tr> <td height="25">密 码：</td> <td><span class="pos_service"> <INPUT class=biaoge3 id=password maxLength=24 type="password" name=password> </span></td> </tr> <tr> <td height="25">验证码：</td> <td><span class="pos_service"> <INPUT class=biaoge3 maxLength=24 name=rand> </span></td> </tr> <tr> <td height="20"> </td> <td><table width="50%" border="0" cellspacing="0" cellpadding="0"> <tr> <td align="center" class="red"><img src="yanzh.jsp"></td> </tr> </table></td> </tr> <tr> <td height="30"> </td> <td> <input type="image" src="img/main_login_go.gif" border="0" onClick="return check()"> </td> </tr> </table> </form> </td> <td> </td> </tr> </table></td> </tr> </table> </body> </html> 验证页面admin_do.jsp <%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*,cn.cmpy.company.*" 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> <jsp:useBean id="user" scope="page" class="cn.cmpy.company.user"></jsp:useBean> <jsp:useBean id="userCtl" scope="page" class="cn.cmpy.company.userCtl"></jsp:useBean> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="0"> <title>登陆验证</title> </head> <body> <% String username=request.getParameter("username"); String password=request.getParameter("password"); String rand=request.getParameter("rand"); String random=(String)session.getAttribute("random"); if(rand!=null && random!=null && !rand.equals(random)){ out.print("<script language='javascript'>window.alert('验证码不正确，请重新输入验证码');history.go(-1);</script>"); } else{ int id=0; id=userCtl.loginUser(username,password); if(id!=0){ session.setAttribute("userid",String.valueOf(id)); response.sendRedirect("main.jsp"); } else { out.print("<script language='javascript'>window.alert('用户名或者密码不正确，请重新登陆');history.go(-1);</script>"); } %> <%}%> </body> </html> （编辑：聊城站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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