文件上傳的動態添加輸入項：
新建upload1.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>文件上傳頁面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
function addfile(){
var files=document.getElementById("files");
<!--動態添加元素-->
var input=document.createElement("input");
input.name="file";
input.type="file";
var delButton=document.createElement("input");
delButton.type="button";
delButton.value="刪除";
delButton.οnclick=function del(){
<!--先刪除父節點-->
this.parentNode.parentNode.removeChild(this.parentNode);
}
var div=document.createElement("div");
div.appendChild(input);<!--添加文件上傳的輸入項-->
div.appendChild(delButton);<!--添加刪除按鈕-->
<!--把div塊添加到files div塊中-->
files.appendChild(div);
}
</script>
</head>
<body>
<form action="${pageContext.request.contextPath}/servlet/UploadServlet" method="post" enctype="multipart/form-data">
<table border="1" width="40%">
<tr>
<td>上傳用戶：</td><td><input type="text" name="user"></td>
</tr>
<tr>
<td></td>
<td><input type="button" value="添加文件" onClick="addfile()"/></td>
</tr>
<tr>
<td></td>
<td><div id="files"></div></td>
</tr>
<tr>
<td></td>
<td>
<input type="submit" value="上傳文件"/>
</td>
</tr>
</table>
</form>
</body>
</html>