jsp杂记

来源：互联网发布：什么软件商城最好用编辑：程序博客网时间：2024/05/17 02:38

1.out.print和<%= %>的区别
out.print(““);
String alter=”验证码不正确”;<%=alter %>
2.jsp跨页面验证并返回上级页面弹出提示，注释部分重点
上级页面代码

<%@ 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</title><style type="text/css">#hand{    text-align:center;    font-weight:bold;}#form1{    text-align: center;}#div1{    margin-top:30px;    }#div2{    margin-top:30px;    }#div3{    margin-top:20px;    }#div4{    margin-top:20px;    }input[type="submit"]{    width:120px;    height:30px;    background-color:#09C;    margin-left:50px;    }#userName{    width:250px;    height:30px;    }#code{    height:30px;    }input[type="password"]{    width:250px;    height:30px;    }</style><%--本页面验证提示 --%><script type="text/javascript">    function checkUserInfo(){        var userName=document.getElementById("userName").value;        var pwd=document.getElementById("pwd").value;        var codes=document.getElementById("codes").value;        if(userName.length<=0 ||pwd.length<=0 || codes.length<=0){            alert("请输入完整信息")            return false;        }        else{            return true;        }    }</script></head><body><%    //接收下级页面UserInfo返回过来的状态码status，用UserInfo页面status的值来判断本页面弹出的提示    String status=request.getParameter("status");    if(status!="" && status!=null){        if(status.equals("0")){            out.print("<script type='text/javascript'>alert('验证码不正确！');</script>");        }        if(status.equals("1")){            out.print("<script type='text/javascript'>alert('用户名或密码错误！');</script>");        }    }%><div id="hand">请 输 入 注 册 信 息</div><!--post请求方式-->   <form id="form1" method="post" action="UserInfo.jsp" onsubmit="return checkUserInfo()">        <div id="div1">用户名：<input type="text" name="userName" id="userName"></div>        <div id="div2"> 密&nbsp;&nbsp;&nbsp;码：<input type="password" name="pwd" id="pwd"></div>        <div id="div3">验证码&nbsp;&nbsp;&nbsp;<img border=0 src="image.jsp" id="imgRandom" onclick="this.src='image.jsp?abc='+Math.random()">        <input type="text" id="codes" name="codes">        </div>        <div id="div4"><input type="submit" value="确定" name="confirm"></div>   </form> <%    session.setAttribute("name", "admin");    session.setAttribute("pwd", "123456");%></body></html>

userInfo代码

<%@page import="javafx.scene.control.Alert"%><%@page import="javax.swing.JOptionPane"%><%@ 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>Insert title here</title></head><body><%      String userName=request.getParameter("userName");    String pwd=request.getParameter("pwd");    String code=request.getParameter("codes");      String codeSessin=session.getAttribute("code").toString();    if(userName.equals("admin") && pwd.equals("123456"))    {        if( codeSessin.equals(code)){              response.sendRedirect("MainPage.jsp");        }               else{               //这自定义状态码status，传到regis以用来辨识弹出状态            response.sendRedirect("Register.jsp?status=0");        }    }    else{        response.sendRedirect("Register.jsp?status=1");    }%></body></html>

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