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使用JSP/Servlet上载文件
使用 JSP/ Servlet上载文件正成为一项常用的任务。以下是一个简单的例程，使用了jspsmart的一个免费的组件。你可以在JSPSMART站点进行下载。
1. Html File
<html>
<body>
<script LANGUAGE="javascript" SRC="JSFunction.js">
</script>
<script language="JavaScript">
<!--
function checkForm(){
if (document.uploadform.adsImage.value==""){
alert("You must choose what image file to upload!");
return false;
}
document.uploadform.submit();
}
function cancelUpload(){
window.close();
window.opener.focus();
}
//-->
</script>
<form name="uploadform" method="post"
action="uploadImage.jsp" ENCTYPE="multipart/form-data"
target=_self>
<center>
<table border="1px" width="65%">
<tr>
<td colspan=2 nowrap align=center>广告图片上载</td>
</tr>
<tr>
<td width="15%" nowrap >广告图片:</td>
<td width="50%" nowrap><input type="file"
name="adsImage" size="20"></td>
</tr>
<tr>
<td align="center" colspan=2 >
<input type="button" value="upload" onclick="return
checkForm();" >
<input type="button" value="Cancel" onclick="return
cancelUpload();">
</td>
</tr>
</form>
</table>
<!--
<a href="Javascript:window.close();">close this window</a>
-->
<script language="JavaScript">
<!--
this.focus();
//-->
</script>
</body>
2. JSP File
<%@ page language="java" import="com.jspsmart.upload.*,
java.sql.*,java.util.* "%>
<%-- use SmartUpload bean --%>
<jsp:useBean id="mySmartUpload" scope="page"
class="com.jspsmart.upload.SmartUpload" />
<%
//Initialization
mySmartUpload.init(config);
mySmartUpload.service(request,response);
//Set Restriction
mySmartUpload.setAllowedFilesList("gif,bmp,jpeg,jpg");
mySmartUpload.setTotalMaxFileSize(51200);
// Upload
try{
mySmartUpload.upload();
}
catch(Exception e){
out.println("<font color=red>Upload File Fail!</font>
<a href=
\"JavaScript:window.history.back();\">back</a><br>");
out.println("<UI>Notes:</UI>");
out.println("<UL>You must set correct File
Name.</UL>");
out.println("<UL>You file size must be less than
50K.</UL>");
out.println("<UL>You can only upload .Gif .jpeg .jpg and
.bmp files.</UL>");
return;
}
//save file to disk
mySmartUpload.getFiles().getFile(0).saveAs("/" +
"FileName");
%>
3. Servlet File (you can do it yourself)
资料来源：碧波山庄Visual Basic http://ctsvb.126.com
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