登陆页
主要使用html表单，javascript验证注册信息
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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=UTF-8"> <title>登陆页</title> <script type="text/javascript"> function check() { var uid = document.getElementById("userid"); if(uid.value =="") { alert("请输入用户名"); return false; } if(dlform.password.value == "") { alert("密码不能为空") return false; } return true; } </script> </head> <body> <form id="dlform" action="yanzheng.jsp" method="post" onSubmit="return check();"> 用户名：<input id="userid" name="userid" type="text" value="请输入用户名" size="20"/> 密码：<input id="password" name="password" type="password" size="20"/> <input type="submit" value="登陆" /> <a href="zhuce.jsp">注册新用户</a> </form> </body> </html>
登陆验证页
使用request获取登录信息，response页面重定向，application获取参数，out输出提示。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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=UTF-8"> <title>验证页</title> </head> <body> <% //获取登陆信息 String userid = request.getParameter("userid"); String password = request.getParameter("password"); //获取保存的注册信息 Object user = application.getAttribute("userxinxi"); if(user == null) //判断获取注册信息为空 { response.sendRedirect("cuowutishi.jsp?msgid=4"); } else //判断用户名密码能否登陆 { String[] zcuser = user.toString().split("#") ; String zcuserid = zcuser[0]; String zcusername = zcuser[1]; String zcpassword = zcuser[2]; if(userid.equals(zcuserid)) { if(password.equals(zcpassword)) { out.print("欢迎" + zcusername + "登陆成功"); //跳转到留言页面 session.setAttribute("login", zcusername); } else { response.sendRedirect("cuowutishi.jsp?msgid=3"); } } else { response.sendRedirect("cuowutishi.jsp?msgid=4"); } } %> <br><br> <a href="liuyan.jsp">留言簿</a> </body> </html>
注册页
主要使用html表单，javascript验证注册信息
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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=UTF-8"> <title>注册新用户</title> <script type="text/javascript"> function check() { if(zcform.zcid.value == "") { alert("请输入用户名"); return false; } if(zcform.zcname.value == "") { alert("请输入用户昵称"); return false; } if(zcform.zcpassword.value == "") { alert("请输入密码"); return false; } if(zcform.qrpassword.value == "") { alert("请输入确认密码"); return false; } if(zcform.qrpassword.value != zcform.zcpassword.value) { alert("确认密码与用户密码不一致"); return false; } return true; } </script> </head> <body> <form id= "zcform" action="saveUser.jsp" method="get" onsubmit="return check();"> 用户代码：<input id="zcid" name="userid" type="text" size="20" /><br><br> 用户名称：<input id="zcname" name="username" type="text" size="20" /><br><br> 用户密码：<input id="zcpassword" name="password" type="password" size="20" /><br><br> 确认密码：<input id="qrpassword" name="qrpassword" type="password" size="20" /><br><br> <input type="submit" value="提交" /><br> <a href="login.jsp">返回登陆页</a> </form> </body> </html>
保存注册页
request获取注册信息，注意中文转码，application储存注册信息，response页面重定向
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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=UTF-8"> <title>保存用户信息</title> </head> <body> <% //获取注册信息 String userid = request.getParameter("userid"); String username = new String(request.getParameter("username").getBytes("ISO-8859-1"),"UTF-8"); String password = request.getParameter("password"); Object user = application.getAttribute("userxinxi"); if(user != null) //判断是否已被注册 { response.sendRedirect("cuowutishi.jsp?msgid=7"); } else //保存注册信息 { String userxinxi = userid + "#" + username + "#" + password; application.setAttribute("userxinxi", userxinxi); response.sendRedirect("cuowutishi.jsp?msgid=6"); } %> </body> </html>
留言页
session查看登陆状态，request获取留言信息，application储存和获取留言信息，response页面重定向，out输出留言。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.util.*" %> <%@ page import="java.text.*" %> <!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=UTF-8"> <title>留言薄</title> </head> <body> <% String userName =""; //检查登陆状态 Object o = session.getAttribute("login"); if(o == null) { response.sendRedirect("cuowutishi.jsp?msgid=8"); } else { userName = o.toString(); } //获取留言信息 String liuy = request.getParameter("liuyan"); //判断留言信息不是空值和空字符串 if(liuy != null && !liuy.equals("")) { String strliuy = new String(liuy.getBytes("ISO-8859-1"),"UTF-8"); Object obj = application.getAttribute("liuyan"); //附加时间信息 Date dt = new Date(); //格式化时间 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String time = sdf.format(dt); //留言内容 + 留言时间 + 留言人 strliuy += " " + time + " " + "留言人“" + userName; ArrayList<String> A; if (obj == null) { A = new ArrayList<String>(); } else { A = (ArrayList<String>)obj; } A.add(strliuy);
response.sendRedirect("liuyan.jsp"); //页面重定向，防止刷新提交数据 application.setAttribute("liuyan", A); } else { } %> <form id="lyform" action="liuyan.jsp" method="post"> 最新留言<br><br> <% //输出留言 int i = 1; Object obj = application.getAttribute("liuyan"); //判断获取的值不为空 if (obj != null) { ArrayList<String> A = (ArrayList<String>)obj; for(int m = A.size() - 1; m >= 0 ; m--) //倒数遍历 { out.print(i + ". " + A.get(m) + "<br>" ); i++; } } %> <br><br> 留言簿<br> <textarea name="liuyan" rows="20" cols="100"></textarea> <br> <input name="tijiao" type="submit" value="提交留言"/> </form> </body> </html>
错误提示页
response页面重定向，定时跳转页面，out输出错误提示。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.util.*" %> <!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=UTF-8"> <title>错误信息</title> </head> <body> <% //获取错误信息 String strMsgId = request.getParameter("msgid"); //判断错误信息是否为空 if(strMsgId == null || strMsgId.trim().length() == 0) { out.print("请正确传递信息"); } else { int iMsgid = Integer.parseInt(strMsgId); switch(iMsgid) { case 1 : out.print("您输入正确的用户名"); break; case 2 : out.print("您输入正确的密码"); break; case 3 : out.print("密码输入错误"); break; case 4 : out.print("该用户不存在"); break; case 5 : out.print("请正确输入用户昵称"); break; case 6 : out.print("提交成功"); break; case 7 : out.print("该用户已存在"); break; case 8 : out.print("请登录系统"); break; default: out.print("无法识别传递的信息"); break; } } //返回登陆页 response.setHeader("refresh", "3;URL=login.jsp"); %> </body> </html>