JSP，怎样正确提取表单的值？(50分)

sercall · 2001-07-11

我想把输入表单的值存在session("spart").
现出错!
请教,谢谢!
-------------------------------------------------------------------
<html>
<head>
<title>temp1</title>
<meta http-equiv="Content-Type" content="text/html;
charset=gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<form name="form1" method="post" action="sp1.jsp">
<p>
<input type="text" name="tpart">
</p>
</form>
<%
//String spart="0001";
//用这句可以通过
String spart=request.getParameter("tpart").trim();
//用这句出错! IE出错:Error: 500 Unknown exception:
session.putValue("spart",spart);
%>
</body>
</html>
------------------------------------------------------------------

kevinfu · 2001-07-23

把這個文件分為兩個，一個html 表單，一個jsp 頁面。
<html>
<head>
<title>temp1</title>
<meta http-equiv="Content-Type" content="text/html;
charset=gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<form name="form1" method="post" action="sp1.jsp">
<p>
<input type="text" name="tpart">
</p>
</form>
</body>
</html>
=================================
/* SP1.JSP */
<%@ page language="java" session="true"%>
<%
//String spart="0001";

String spart=request.getParameter("tpart").trim();
session.putValue("spart",spart);
%>
<hr>
<%
String showspart=(String)session.getValue("spart");
out.print(showspart);
%>
<hr>

conquer · 2001-08-24

提供一段代码以供参考：
page-1:
<%@ page session = "true"%>
String itemsum=request.getParameter("item_sum");
Integer item_s=new Integer(item_sum);
session.putValue("item_s",item_s);
page-2:
<%@ page session = "true"%>
Integer sum=(Integer)session.getValue("item_s");
int ItemSum=sum.intValue();

Sheldon · 2001-09-21

执行String spart=request.getParameter("tpart")后，
spart有可能为null，所以trim()会出错
建议：
String spart=request.getParameter("tpart");
if (spart != null) {
spart.trim();
...
}

hotsoup · 2001-09-24

request.getParameter("tpart")是一个object，不能直接使用trim()；
应该在将其转换为String后再进行处理，
如，spart = spart.trim();

曹晓钢 · 2001-09-25

Sheldon is correct.

delphiasp · 2001-10-03

接受答案了.

JSP，怎样正确提取表单的值？(50分)

sercall

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