如何从以前的jsp页面到结果页面检索值？
[英]How to retrieve the values from previous jsp page to result page?
问题描述
我正在创建测验应用程序。 在这里，有5个具有5个不同测验的jsp页面。 如果我使用1个jsp页面和结果页面，则可以正常工作。 它从QuizPage5.jsp重定向并在ResultPage.jsp中显示结果。 我需要显示从QuizPage1.jsp，QuizPage2.jsp，QuizPage3.jsp，QuizPage4.jsp和QuizPage5.jsp到ResultPage.jsp的所有结果。
我用了
在jsp1中传递值。
<form action="">
<input type="hidden" name="hidden" value="hidden">
<input type="submit" value="submit"></form>
在jsp2中获取价值
String value=request.getParameter("hidden");
但是，我正在获取java.lang.NullPointerException
这是我的代码。
QuizPage1.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script language="JavaScript">
function check()
{
var radio_choice = false;
for (counter = 0; counter < myform.grp.length; counter++)
{
if (myform.grp[counter].checked)
radio_choice = true;
}
if (!radio_choice)
{
alert("Please select one.")
return (false);
}
return(true);
}
</script>
</head>
<body>
<h3>Quiz No.1</h3>
Q1.Which one of the following is the Capital of India?<br><br>
<form action="QuizPage2.jsp" method="post" name="myform" onsubmit="return check();">
<input type="radio" name="grp" value="New Delhi" >New Delhi<br>
<input type="radio" name="grp" value="Kolkata" >Kolkata<br>
<input type="radio" name="grp" value="Chennai" >Chennai<br>
<input type="radio" name="grp" value="Mumbai" >Mumbai<br>
<br><br><input type="submit" value="Next Question">
<input type="hidden" name="hidden" value="grp">
<input type="submit" value ="Back" onclick="window.history.back();"/>
</form>
</body>
</html>
QuizPage2.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script language="JavaScript">
function check()
{
var radio_choice = false;
for (counter = 0; counter < myform2.grp2.length; counter++)
{
if (myform2.grp2[counter].checked)
radio_choice = true;
}
if (!radio_choice)
{
alert("Please select any one Answer");
return (false);
}
return(true);
}
</script>
</head>
<body>
<h3>Quiz No.2</h3>
Q2. Where is Chennai Located?<br><br>
<form action="QuizPage3.jsp"method="post" name="myform2" onsubmit="return check();">
<input type="radio" name="grp2" value="Karnataka" >Karnataka<br>
<input type="radio" name="grp2" value="Tamilnadu" >Tamilnadu<br>
<input type="radio" name="grp2" value="Andhra Pradesh" >Andhra Pradesh<br>
<input type="radio" name="grp2" value="Maharashtra" >Maharashtra<br>
<br><br><input type="submit" value="Next Question">
<input type="hidden" name="hidden" value="grp2">
<input type="submit" value ="Back" onclick="window.history.back();"/>
</form>
<%
String s1=request.getParameter("grp");
%>
</body>
</html>
QuizPage3.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script language="JavaScript">
function check()
{
var radio_choice = false;
for (counter = 0; counter < myform3.grp3.length; counter++)
{
if (myform3.grp3[counter].checked)
radio_choice = true;
}
if (!radio_choice)
{
alert("Please select any one Answer");
return (false);
}
return(true);
}
</script>
</head>
<body>
<h3>Quiz No.3</h3>
Q3. What is the largest state in the USA<br><br>
<form action="QuizPage4.jsp"method="post" name="myform" onsubmit="return check();">
<input type="radio" name="grp3" value="New York" >New York<br>
<input type="radio" name="grp3" value="Alaska" >Alaska<br>
<input type="radio" name="grp3" value="California" >California<br>
<input type="radio" name="grp3" value="Melbourne" >Melbourne<br>
<br><br><input type="submit" value="Next Question">
<input type="hidden" name="hidden" value="grp3">
<input type="submit" value ="Back" onclick="window.history.back();"/>
</form>
<%
String s2=request.getParameter("grp2");
%>
</body>
</html>
QuizPage4.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script language="JavaScript">
function check()
{
var radio_choice = false;
for (counter = 0; counter < myform4.grp4.length; counter++)
{
if (myform4.grp4[counter].checked)
radio_choice = true;
}
if (!radio_choice)
{
alert("Please select any one Answer");
return (false);
}
return(true);
}
</script>
</head>
<body>
<h3>Quiz No.4</h3>
Q4. The famous Dilwara Temples are situated in<br><br>
<form action="QuizPage5.jsp"method="post" name="myform" onsubmit="return check();">
<input type="radio" name="grp4" value="Uttar Pradesh" >Uttar Pradesh<br>
<input type="radio" name="grp4" value="Maharashtra" >Maharashtra<br>
<input type="radio" name="grp4" value="Andhra Pradesh" >Andhra Pradesh<br>
<input type="radio" name="grp4" value="Rajasthan" >Rajasthan<br>
<br><br><input type="submit" value="Next Question">
<input type="hidden" name="hidden" value="grp4">
<input type="submit" value ="Back" onclick="window.history.back();"/>
</form>
<%
String s3=request.getParameter("grp3");
%>
</body>
</html>
QuizPage5.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script language="JavaScript">
function check()
{
var radio_choice = false;
for (counter = 0; counter < myform5.grp5.length; counter++)
{
if (myform5.grp5[counter].checked)
radio_choice = true;
}
if (!radio_choice)
{
alert("Please select any one Answer");
return (false);
}
return(true);
}
</script>
</head>
<body>
<h3>Quiz No.5</h3>
Q5. The Indian Institute of Science is located at<br><br>
<form action="ResultPage.jsp"method="post" name="myform" onsubmit="return check();">
<input type="radio" name="grp5" value="Chennai" >Chennai<br>
<input type="radio" name="grp5" value="Bangalore" >Bangalore<br>
<input type="radio" name="grp5" value="Mumbai" >Mumbai<br>
<input type="radio" name="grp5" value="Hyderabad" >Hyderabad<br>
<br><br><input type="submit" value="Show Result">
<input type="hidden" name="hidden" value="grp5"/>
</form>
<%
String s4=request.getParameter("grp4");
%>
</body>
</html>
ResultPage.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Quiz Result</title>
</head>
<body>
<%
String answer="New Delhi";
String s1=request.getParameter("grp");
if(s1.equals(answer))
{
out.println("Correct Answer");
}
else
{out.println("Wrong Answer! The Correct Answer is :"+answer);
}
%>
<%
String answer2="Tamilnadu";
String s2=request.getParameter("grp2");
if(s2.equals(answer2))
{
out.println("Correct Answer");
}
else
{out.println("Wrong Answer! The Correct Answer is :"+answer2);
}
%>
<%
String answer3="Alaska";
String s3=request.getParameter("grp3");
if(s3.equals(answer3))
{
out.println("Correct Answer");
}
else
{out.println("Wrong Answer! The Correct Answer is :"+answer3);
}
%>
<%
String answer4="Rajasthan";
String s4=request.getParameter("grp4");
if(s4.equals(answer4))
{
out.println("Correct Answer");
}
else
{out.println("Wrong Answer! The Correct Answer is :"+answer4);
}
%>
<%
String answer5="Bangalore";
String s5=request.getParameter("grp5");
if(s5.equals(answer5))
{
out.println("Correct Answer");
}
else
{out.println("Wrong Answer! The Correct Answer is :"+answer5);
}
%>
</body>
</html>
非常感谢您的帮助。 提前致谢
4 个解决方案
解决方案1
5 已采纳 2013-11-15 05:12:01
如果您希望可以跨多个页面访问的数据，请考虑使用会话存储数据。 例如，如果page1.jsp向page2.jsp提交了表单参数“ page1Result”，则在page2.jsp中，执行以下操作：
String page1Result = request.getParameter("page1Result");
request.getSession().setAttribute("page1Result", page1Result);
然后，在以后的某个时刻（例如第5页），您可以按以下方式访问page1值：
String page1Value = (String)request.getSession().getAttribute("page1Result);
================================================== =============================将其应用于您的代码：
在page2 jsp中，将文件末尾的scriptlet更改为：
<%
String s1=request.getParameter("grp");
request.getSession().setAttribute("s1", s1);
%>
在第3页JSP中，将脚本更改为：
<%
String s2=request.getParameter("grp2");
request.getSession().setAttribute("s2", s2);
%>
等等。
最后在ResultPage.jsp上（仅显示示例2）
out.println("Wrong Answer! The Correct Answer for question 2 is :"+session.getAttribute("s2"));
解决方案2
0 2013-11-15 05:10:44
在jsp1上
String passThis = "pass this value";
request.setAttribute("param1",passThis);
调度到jsp 2
在jsp2中
String getParam = request.getAttribute("param1");
解决方案3
0 2013-11-15 05:11:20
通过JavaScript切换问题并立即提交所有内容。
解决方案4
0 2013-11-15 05:15:19
我没有详细看代码。 但是这个问题需要多重请求范式。 但是result.jsp虽然从请求对象获取所有答案。 而它应该是会话对象。 每个问题的答案都应该存储在会话中。 因此它是可访问的，并且不会受到影响。
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