临时变量保存在jsp中 [英] temporary variable save in jsp
问题描述
我创建了测验项目.单击选项单选按钮时，我想保存显示用户答案列表.在最后一次考试中，我想用Ajax插入mysql所有答案列表.
i have created quiz project. i want to save show user answerlist when click option radio button. at last exam i want with ajax insert mysql all answerlist.
在解析答案列表中，我编写了这样的代码.但在每个新页面中，单击选项previos答案表均显示为空.
in parse answerlist i write such code. but in every new page click option previos answer table shows null.
请告诉我如何将所有答案临时保存在jsp中，然后插入mysql:
please advise me how temporary save all answer in jsp then insert mysql :
<html>
<head>
<% Logger log = Logger.getLogger("Test");%>
<% Long qnum = (Long) session.getAttribute("qnumer"); %>
<% String answer = (String) session.getAttribute("answer");%>
<%log.info(qnum + answer);%>
<% String [] answerqlist = new String[6] ; %>
<%switch (Integer.parseInt(String.valueOf(qnum))){
case 1:
String a1 = answer;
answerqlist[0]=a1;
break;
case 2:
String a2 = answer;
answerqlist[1]=a2;
break;
case 3:
String a3 = answer;
answerqlist[2]=a3;
break;
case 4:
String a4 = answer;
answerqlist[3]=a4;
break;
case 5:
String a5 = answer;
answerqlist[4]=a5;
break;
case 6:
String a6 = answer;
answerqlist[5]=a6;
break;
}%>
</head>
<body>
<table cellspacing="0" width="100%" style="border: solid 1px;" >
<thead>
<tr>
<th>1</th>
<th>2</th>
<th>3</th>
<th>4</th>
<th>5</th>
<th>6</th>
</tr>
</thead>
<tbody>
<tr align="center">
<td><%=answerqlist[0]%></td>
<td><%=answerqlist[1]%></td>
<td><%=answerqlist[2]%></td>
<td><%=answerqlist[3]%></td>
<td><%=answerqlist[4]%></td>
<td><%=answerqlist[5]%></td>
</tr>
</tbody>
</table>
</body>
</html>
推荐答案
您正在从会话中获取信息:
You are getting from the session :
<% Long qnum = (Long) session.getAttribute("qnumer"); %>
<% String answer = (String) session.getAttribute("answer");%>
但是我看不到在会话中设置这些值的任何地方.
But I don't see anywhere the place where you set those values in the session.
对于数组answerqlist也是一样，您要在每个页面上构建一个新页面，应将其保存到会话中(并也加载它).
The same will be for the array answerqlist, you are building a new one every page, you should save it into the session (and load it too).
PS:您真的应该看看如何避免JSP文件中的Java代码?
PS : You should really take a look to How to avoid Java code in JSP files?
PS 2:不需要切换，因为可以将其减少为:
PS 2: The switch is not necessary, since this could be reduce as :
int index = Integer.parseInt(String.valueOf(qnum));
answerqlist[index - 1] = answer;
您一遍又一遍地执行相同的操作，但是索引取决于qnum.当然，您可以添加检查以防止异常.
You are doing the same over and over but with the index depending on the qnum. Of course, you can add a check to prevent an exception.
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