请问JSP中一个变量的含义
日期：2014-05-18 浏览次数：20692 次
请教JSP中一个变量的含义
请教JSP中一个变量的含义
JSP文件中，
<input type=text maxlength= "20 " size= "20 " name = "number "
value= " <c:if test= "${outstockone!=null} ">
<c:out value= "${outstockone.number} "/>
</c:if> "/>
请问：
test= "${outstockone!=null} "中的outstockone代表什么参数？
好像根JSP的文件名没关系。要单判断它是不是空，凭啥呀？都不知道它的来历和含义。迷糊了
相关原文件：
＝＝＝＝＝＝＝＝＝＝＝ outstockone.jsp ＝＝＝＝＝＝＝＝＝＝＝＝＝＝
<%@ taglib prefix= "spring " uri= "/spring " %>
<%@ taglib prefix= "c " uri= "http://java.sun.com/jstl/core " %>
<%@ taglib prefix= "fmt " uri= "http://java.sun.com/jstl/fmt " %>
<%@ taglib prefix= "tiles " uri= "http://jakarta.apache.org/struts/tags-tiles " %>
<html>
<head>
<%@ page
language= "java "
contentType= "text/html; charset=GB18030 "
pageEncoding= "GB18030 "
%>
<meta http-equiv= "Content-Type " content= "text/html; charset=GB18030 ">
<title> OutStock Step One </title>
<LINK href= "../theme/style.css " rel= "stylesheet " type= "text/css ">
</head>
<br>
<body>
<center>
<form method= "POST " action= "outstockbefore.htm ">
<h1> OutStock Step One </h1>
<hr>
<table>
<tr>
<td> OutStock Number: </td>
<td>
<input type=text maxlength= "20 " size= "20 " name = "number " value= " <c:if test= "${outstockone!=null} "> <c:out value= "${outstockone.number} "/> </c:if> "/>
</td>
</tr>
<tr>
<td> OutStock Type: </td>
<td>
<select name= "type ">
<OPTION value= "11 "
<c:if test= "${outstockone!=null&&outstockone.type== '11 '} "> selected </c:if>
> 材料出库 </OPTION>
<OPTION value= "12 " <c:if test= "${outstockone!=null&&outstockone.type== '12 '} "> selected </c:if>
> 销售出库 </OPTION>
</select>
</td>
</tr>
<tr>
<td> OutStock Date: </td>
<td> <input type=text maxlength= "20 " &nbs
请教JSP中一个变量的含义
JSP文件中，
<input type=text maxlength= "20 " size= "20 " name = "number "
value= " <c:if test= "${outstockone!=null} ">
<c:out value= "${outstockone.number} "/>
</c:if> "/>
请问：
test= "${outstockone!=null} "中的outstockone代表什么参数？
好像根JSP的文件名没关系。要单判断它是不是空，凭啥呀？都不知道它的来历和含义。迷糊了
相关原文件：
＝＝＝＝＝＝＝＝＝＝＝ outstockone.jsp ＝＝＝＝＝＝＝＝＝＝＝＝＝＝
<%@ taglib prefix= "spring " uri= "/spring " %>
<%@ taglib prefix= "c " uri= "http://java.sun.com/jstl/core " %>
<%@ taglib prefix= "fmt " uri= "http://java.sun.com/jstl/fmt " %>
<%@ taglib prefix= "tiles " uri= "http://jakarta.apache.org/struts/tags-tiles " %>
<html>
<head>
<%@ page
language= "java "
contentType= "text/html; charset=GB18030 "
pageEncoding= "GB18030 "
%>
<meta http-equiv= "Content-Type " content= "text/html; charset=GB18030 ">
<title> OutStock Step One </title>
<LINK href= "../theme/style.css " rel= "stylesheet " type= "text/css ">
</head>
<br>
<body>
<center>
<form method= "POST " action= "outstockbefore.htm ">
<h1> OutStock Step One </h1>
<hr>
<table>
<tr>
<td> OutStock Number: </td>
<td>
<input type=text maxlength= "20 " size= "20 " name = "number " value= " <c:if test= "${outstockone!=null} "> <c:out value= "${outstockone.number} "/> </c:if> "/>
</td>
</tr>
<tr>
<td> OutStock Type: </td>
<td>
<select name= "type ">
<OPTION value= "11 "
<c:if test= "${outstockone!=null&&outstockone.type== '11 '} "> selected </c:if>
> 材料出库 </OPTION>
<OPTION value= "12 " <c:if test= "${outstockone!=null&&outstockone.type== '12 '} "> selected </c:if>
> 销售出库 </OPTION>
</select>
</td>
</tr>
<tr>
<td> OutStock Date: </td>
<td> <input type=text maxlength= "20 " &nbs
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