http://blog.csdn.net/andyseon/archive/2007/03/01/1518319.aspx
http://sunny.blog.51cto.com/182601/32232
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
<!--
BODY{
font-size:9pt
}
-->
</style>
<SCRIPT language=javascript>
function check_file()
{
var strFileName=form1.FileName.value;
if (strFileName=="")
{
alert("请选择要上传的文件");
return false;
}
}
</SCRIPT>
<script language="javascript">
// javascript 动态添加 input type="file"
var i = 1;
function addFile(dvID, inputNamePrefix)
{
var dv = document.getElementById(dvID);
var file = document.createElement("input");
file.type = "file";
file.id = file.name = inputNamePrefix + i;
dv.appendChild(file);
var btn = document.createElement("input");
btn.type = "button";
btn.id = btn.name = "btn" + i;
btn.value = "删除" ;
btn.onclick = function() {
var b = document.getElementById(btn.id);
dv.removeChild(b.nextSibling); //remove <BR>
dv.removeChild(b.previousSibling); //file
dv.removeChild(b); //btn
}
dv.appendChild(btn);
dv.appendChild(document.createElement("BR"));
i++;
}
</script>
</head>
<body>
<!--
<form action="upfile.jsp" method="post" name="form1" onSubmit="return check_file()" enctype="multipart/form-data">
<input name="FileName" type="FILE" size="20">
<input type="submit" name="Submit" value="上传">
</form>
-->
<form action="upfile.jsp" method="post" name="form1" onSubmit="return check_file()" enctype="multipart/form-data">
<div id="dvTitles"></div>
<input type="button" value="添加单个文件" onclick="addFile('dvTitles','file')">
<input type="submit" name="Submit" value="上传已添加文件">
</form>
</body>
</html>
upfile.jsp:
<%@ page contentType="text/html;charset=utf-8"
import="com.jspsmart.upload.SmartFile"
%>
<%
/*======================================*\
* Kimi sun
* 2007.03.01
* 上传文件
\*======================================*/
%>
<jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.SmartUpload" />
<HTML>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<BODY>
<%
// 初始化
final String upFileType="zip|rar|doc|txt|jpg|xls"; //上传文件类型
final int MAXFILESIZE=20480; //上传文件大小限制
String errMsg=null; //错误信息
boolean err=false; //错误标志
int fileSize=0; //文件大小
mySmartUpload.initialize(pageContext);
// 上传文件
mySmartUpload.upload();
//判断将要上传文件的总容量是否超过上限
int count = mySmartUpload.getSize();
if(count>MAXFILESIZE){
out.print ("<script>alert('上传失败！文件大小:"+count/1024+"K超出了限定的范围(最大"+MAXFILESIZE/1024+"K)');this.history.go(-1);</script>");
//response.sendRedirect("http://127.0.0.1:8080/javastudy/upload.htm");
}
// 循环取得上传所有文件
else{
for(int i=0;i<mySmartUpload.getFiles().getCount();i++){
com.jspsmart.upload.SmartFile myFile = mySmartUpload.getFiles().getFile(i);
if (!myFile.isMissing()) {
String myFileName=myFile.getFileName();//得到文件名
//if(myFileName.length()>0){ //取得不带后缀的文件名
//String subFileName=myFileName.substring(0,myFileName.lastIndexOf('.'));
//}
String fileType=myFile.getFileExt();//得到文件扩展名
fileType=fileType.toLowerCase(); //将扩展名转换成小写
if (upFileType.indexOf(fileType)==-1){
err=true;
errMsg="文件"+myFileName+"上传失败！只允许上传以下格式的文件："+upFileType;
}
//得到单个文件大小
//fileSize+=myFile.getSize();
//if (err==false&&fileSize>MAXFILESIZE){
// err=true;
// errMsg="上传失败！文件大小超出了限定的范围(最大"+MAXFILESIZE/1024+"K)";
//}
if(err==false){
//取得路径
//String adss=getServletContext().getRealPath("/")+"JSP\\";
//String trace=adss+myFileName;
//保存文件
//String newFileName="001."+fileType; //可自动生成文件名以防止同名覆盖
//myFile.saveAs(trace);
myFile.saveAs("C:\\Java\\tomcat5520\\webapps\\javastudy\\"+myFileName);
}else{
out.print ("<script>alert('"+errMsg+"');this.history.go(-1);</script>");
}
}
}
out.print("<script>alert('上传文件成功!文件大小："+count/1024+"K');this.history.go(-1);</script>");
}
%>
</BODY>
</HTML>