为什么仅在2种情况下out.println输出为空
[英]Why out.println output is null for just 2 cases
问题描述
Everything is ok but mt & cat give me null... 
一切都很好，但是山猫和猫给了我空...
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Video Club</title>
</head>
<body>
<h1>Movie & Customer Info</h1>
<%
String name = request.getParameter("name");
out.println("Όνομα: " + name);
%><br><br>
<%
String sur = request.getParameter("surname");
out.println("Επίθετο: " + sur);
%><br><br>
<%
String card = request.getParameter("card");
out.println("Πιστωτική κάρτα: " + card);
%><br><br>
<%
String mt = request.getParameter("MovieTitle");
out.println("Τίτλος Ταινίας: " + mt);
%><br><br>
<%
String cat = request.getParameter("category");
out.println("Category: " + cat);
%>
</body>
I'm using netbeans IDE 8.0.2 and this is finalResults.jsp linked with checkout.jsp 我正在使用netbeans IDE 8.0.2，这是与checkout.jsp链接的finalResults.jsp
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Video Club</title>
</head>
<body>
<h1>Checkout</h1>
<h3>Please Use Latin Characters</h3>
<%
String mt = request.getParameter("MovieTitle");
out.println("Τίτλος Ταινίας: " + mt);
%>
<form action ="finalResults.jsp" method="post">
<br>
Όνομα:<br>
<input type="text" name="name">
<br>
Επίθετο:<br>
<input type="text" name="surname">
<br>
Πιστωτική κάρτα:<br>
<input type="text" name="card">
<br><br>
<input type ="submit" value ="Ολοκλήρωση"/>
</form>
</body>
checkout.jsp has also a previous one named list.jsp and before that is index.jsp checkout.jsp也有一个以前的名字叫list.jsp的文件，在此之前是index.jsp
2 个解决方案
解决方案1
0 2015-11-22 00:17:30
mate, you are missing the input in your form 队友，您缺少表格中的输入
<form action ="finalResults.jsp" method="post">
<br>
Όνομα:<br>
<input type="text" name="name">
<br>
Επίθετο:<br>
<input type="text" name="surname">
<br>
Πιστωτική κάρτα:<br>
<input type="text" name="card">
<br><br>
<input type="text" name="MovieTitle">
<input type="text" name="catagory">
<input type ="submit" value ="Ολοκλήρωση"/>
</form>
解决方案2
0 2015-11-22 23:34:49
I used session.setAttribute("SES_CAT",cat); 我使用了session.setAttribute（“ SES_CAT”，cat）; in the second .jsp to store the value and String cat=(String)session.getAttribute("SES_CAT"); 在第二个.jsp中存储值和String cat =（String）session.getAttribute（“ SES_CAT”）; in the last .jsp to call it.Thanks for the idea for the hidden fields but that worked better for me... 在最后一个.jsp中调用它。感谢隐藏字段的想法，但对我来说效果更好...
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