从一个jsp获得价值到另一个jsp
[英]Getting value from one jsp to another jsp
问题描述
I developed simeple web application. 
我开发了Simeple Web应用程序。 In one jsp i get values from preivous servlet file using getattribute and set attribute.I got the values. 在一个jsp中，我使用getattribute和set attribute从先前的servlet文件中获取了值。 But after now i want that values from current jsp to another jsp file. 但是现在以后，我希望该值从当前的jsp到另一个jsp文件。 Using getattribute and setattribute i used but the values should display as null. 我使用了getattribute和setattribute，但是值应显示为null。
firstjsp file: firstjsp文件：
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="javax.servlet.http.*" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="payment.jsp" method="POST">
<h1>Confirmation</h1>
<%
Integer amount=(Integer)request.getAttribute("amt");
String service=(String )request.getAttribute("service");
String month=(String )request.getAttribute("month");
Integer day=(Integer)request.getAttribute("day");
String time=(String)request.getAttribute("time");
String city=(String)request.getAttribute("city");
out.println("<center>");
out.println("<table><tr>");
out.println("<td><h2>Service:"+service+"</td></tr>");
out.println("<tr><td><h2>Month:"+month+"</td></tr>");
out.println("<tr><td><h2>Date:"+day+"</td></tr>");
out.println("<tr><td><h2>Time:"+time+"</td></tr>");
out.println("<tr><td><h2>City:"+city+"</td></tr>");
out.println("<tr><td><h2>Total Amount:Rs."+amount+"</td></tr>");
out.println("</center>");
request.setAttribute("amt",amount);
%>
<center>
<input type="submit" value="Confirm"></input>
</center>
</form>
</body>
</html>
payment.jsp: payment.jsp：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h2>Select bank</h2>
<%!Integer money;%>
<%
if(request.getAttribute("amt")!=null)
{
money=(Integer) request.getAttribute("amt");
out.println(""+money);
}
%>
</body>
</html>
3 个解决方案
解决方案1
1 2013-03-10 04:51:10
Set whatever values you want to access in payment.jsp in HTML hidden control as below :- 设置您想要在HTML隐藏控件中的payment.jsp中访问的任何值，如下所示：-
<form action="payment.jsp" method="POST">
<input type="hidden" name="amt" value="<%= amount%>" />
</form>
Request object in JSP spans only a single HTTP request. JSP中的请求对象仅跨越一个HTTP请求。 So when you forward the request to your first JSP file it is a single request. 因此，当您将请求转发到第一个JSP文件时，它是一个请求。 But when you submit the form and payment.jsp loads, the request object is cleared since it is a new HTTP request to the server. 但是，当您提交表单并加载payment.jsp时，由于该对象是对服务器的新HTTP请求，因此该请求对象被清除。
解决方案2
1 2013-03-10 06:40:30
You may use session instead of request implicit object. 您可以使用session代替request隐式对象。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="payment.jsp" method="POST">
<h1>Confirmation</h1>
<%
Integer amount=(Integer)request.getAttribute("amt");
String service=(String )request.getAttribute("service");
String month=(String )request.getAttribute("month");
Integer day=(Integer)request.getAttribute("day");
String time=(String)request.getAttribute("time");
String city=(String)request.getAttribute("city");
out.println("<center>");
out.println("<table><tr>");
out.println("<td><h2>Service:"+service+"</td></tr>");
out.println("<tr><td><h2>Month:"+month+"</td></tr>");
out.println("<tr><td><h2>Date:"+day+"</td></tr>");
out.println("<tr><td><h2>Time:"+time+"</td></tr>");
out.println("<tr><td><h2>City:"+city+"</td></tr>");
out.println("<tr><td><h2>Total Amount:Rs."+amount+"</td></tr>");
out.println("</center>");
session.setAttribute("amt",amount);//Changed to session
%>
<center>
<input type="submit" value="Confirm"></input>
</center>
</form>
</body>
</html>
payment.jsp: payment.jsp：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h2>Select bank</h2>
<%!Integer money;%>
<%
if(session.getAttribute("amt")!=null)//changed to session
{
money=(Integer) session.getAttribute("amt");//changed to session
out.println(""+money);
session.removeAttribute("amt");
}
%>
</body>
</html>
解决方案3
0 2016-12-22 13:55:17
in order to access the value you set in the first jsp, you have better to put the value using session in this way. 为了访问您在第一个jsp中设置的值，最好以这种方式使用session来放置值。 request.getSeession.setAttribute("amount",amount); then in the second jsp access it like this 然后在第二个jsp中像这样访问它
<form>
<input type="hidden" value="<%=session.getAttribute("amount")%>"/>
<form>
i hope it solves your problem 我希望它能解决您的问题
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