<%@ 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>登录页</title> <script type="text/javascript"> //添加函数 function check() { var userid = document.getElementById("userid"); //获取 userid 这个id名的相关数据 if (userid.value == "") //判断输入的 userid 是否为空 { alert("用户代码不可为空！"); return false; //返回一个空值使下方按钮不执行操作 } if(uform.password.value == "") { alert("密码不能为空"); return false; } return true; } </script> </head> <body> <form id="uform" action="yanzheng.jsp" method="post" onSubmit="return check();"> 账户：<input id="userid" type="text" name="userid" width=30 /> <br> 密码：<input id="password" type="password" name="password" width=30 /> <br> <input type="submit" value="登录" /> <a href="zhuce.jsp" >注册新用户</a> </form> </body> </html>
<%@ 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>消息页面</title> </head> <body> <% String strMsgID = request.getParameter("msgid"); 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("请正确输入用户代码"); break; case 2: out.print("请正确输入密码"); 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("请正确输入用户名称"); break; case 6: out.print("提交成功"); break; case 7: out.print("用户代码已存在"); break; case 8: out.print("请登录系统！"); break; default: out.print("传递的msgid不认识"); break; } } response.setHeader("refresh", "3;URL=login.jsp"); %> </body> </html>
<%@ 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>登录验证页</title> </head> <body> <% String strUserid = request.getParameter("userid"); String strPW = request.getParameter("password"); if (strUserid == null || strUserid.trim().length() == 0) { response.sendRedirect("message.jsp?msgid=1"); } else if (strPW == null || strPW.trim().length() == 0) { response.sendRedirect("message.jsp?msgid=2"); } else { //查找用户信息 Object obj = application.getAttribute(strUserid); if (obj != null) { String strUser = obj.toString(); String[] user = strUser.split("#"); String strUID = user[0]; String strUsername = user[1]; String strP = user[2]; if(strPW.equals(strP)) { out.print("欢迎 " + strUsername + " 登录系统"); //创建 session 用来判断是否已登陆 session.setAttribute("dfe", strUserid ); } else { response.sendRedirect("message.jsp?msgid=3"); } } else { response.sendRedirect("message.jsp?msgid=4"); } } %> <br> <a href="liuyan.jsp">留言簿</a> </body> </html>
<%@ 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> <% String strUserid = request.getParameter("userid"); String strUsername = request.getParameter("username"); String strPW = request.getParameter("password"); if (strUserid == null || strUserid.trim().length() == 0) { response.sendRedirect("message.jsp?msgid=1"); } else if (strUsername == null || strUsername.trim().length() == 0) { response.sendRedirect("message.jsp?msgid=5"); } else if (strPW == null || strPW.trim().length() == 0) { response.sendRedirect("message.jsp?msgid=2"); } else { //查找用户信息 Object obj = application.getAttribute(strUserid); if (obj != null) { response.sendRedirect("message.jsp?msgid=7"); } else { strUsername = new String(strUsername.getBytes("ISO-8859-1"),"UTF-8"); String strUser = strUserid + "#" + strUsername + "#" + strPW; application.setAttribute(strUserid, strUser); response.sendRedirect("message.jsp?msgid=6"); } } %> </body> </html>
<%@ 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>用户注册</title> <script type="text/javascript"> function yanz() { if (zhugan.userid.value == "") { alert("用户代码不能为空！"); return false; } if(zhugan.username.value == "") { alert("用户名称不能为空！"); return false; } if(zhugan.password.value == "") { alert("登陆密码不能为空！"); return false; } /* if(zhugan.passwore.value == "") { alert("确认密码不能为空！"); return false; } */ if(zhugan.password.value != zhugan.passwore.value) { alert("登陆密码与确认密码不相同！"); return false; } return true; } </script> </head> <body> <form id="zhugan" action="saveUser.jsp" method="post" onSubmit="return yanz();"> 用户代码：<input id="userid" type="text" name="userid" width=30 /> <br><br> 用户名称：<input id="username" type="text" name="username" width=30 /> <br><br> 登录密码：<input id="password" type="password" name="password" width=30 /> <br><br> 确认密码：<input id="passwore" type="password" name="pueren" width=30 /> <br><br> <input type="submit" value="提交" /> </form> </body> </html>
<%@ 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>留言页面</title> <% String username = ""; //检查登录状态 Object o = session.getAttribute("dfe"); if(o == null) { response.sendRedirect("message.jsp?msgid=8"); } else { username = o.toString(); } String liuy = request.getParameter("liuy"); if(liuy != null && !liuy.equals("")) //liuy 不为空 liuy 也不为空字符串 { String strLiuy = new String(liuy.getBytes("ISO-8859-1"),"UTF-8"); //转码 //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"); // 真实空格 strLiuy += " " + sdf.format(dt) + "留言人：" + username; Object obj = application.getAttribute("liuy"); //简化代码 ArrayList<String> A; if(obj == null) { A = new ArrayList<String>(); } else { A = (ArrayList<String>)obj; } A.add( strLiuy); application.setAttribute("liuy", A); /* if(obj == null) { ArrayList<String> al = new ArrayList<String>(); al.add(strLiuy); application.setAttribute("liuy", al); } else { ArrayList<String> A = (ArrayList<String>)obj; A.add( strLiuy); application.setAttribute("liuy", A); } */ } else { } %> </head> <body> <form> 最新留言： <br> <br><br> <% int i = 1; Object obj = application.getAttribute("liuy"); if(obj != null) { //取出留言 ArrayList<String> A = (ArrayList<String>)application.getAttribute("liuy"); // for(String ly : A) for(int m = A.size() - 1; m >= 0 ; m--) //新出现的在上边 { // out.print(i + "、" + ly + "<br>"); out.print(i + "、" + A.get(m) + "<br>"); //实现才出现的在上边 i++; } } %> 留言内容： <textarea rows="10" cols="30" name="liuy"></textarea> <br> <input type="submit" value="提交" /> </form> </body> </html>
原文：http://www.cnblogs.com/name-hanlin/p/5005629.html
