要先引入一个包， 如果大家需要这个包请和我要就哦。
（注意：在新建完upload.html和do_upload.jsp之后好要建一个文件夹在同级目录下upload）
upload.html原代码:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>文件上传</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<p> </p>
<p align="center">上传文件选择</p>
<FORM METHOD="POST" ACTION="do_upload.jsp"
ENCTYPE="multipart/form-data">
<input type="hidden" name="TEST" value="good">
<table width="75%" border="1" align="center">
<tr>
<td><div align="center">1、
<input type="FILE" name="FILE1" size="30">
</div></td>
</tr>
<tr>
<td><div align="center">2、
<input type="FILE" name="FILE2" size="30">
</div></td>
</tr>
<tr>
<td><div align="center">3、
<input type="FILE" name="FILE3" size="30">
</div></td>
</tr>
<tr>
<td><div align="center">4、
<input type="FILE" name="FILE4" size="30">
</div></td>
</tr>
<tr>
<td><div align="center">
<input type="submit" name="Submit" value="上传它！">
</div></td>
</tr>
</table>
</FORM>
</body>
</html>
do_upload.jsp原代码：
<%@ page contentType="text/html; charset=gb2312" language="java"
import="java.util.*,com.jspsmart.upload.*" errorPage="" %>
<html>
<head>
<title>文件上传处理页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<%
SmartUpload su = new SmartUpload();
su.initialize(pageContext);
su.upload();
int count = su.save("/upload");
out.println(count+"个文件上传成功！<br>");
out.println("TEST="+su.getRequest().getParameter("TEST")+"<BR><BR>");
for (int i=0;i<su.getFiles().getCount();i++)
{
com.jspsmart.upload.File file = su.getFiles().getFile(i);
if (file.isMissing()) continue;
out.println("<TABLE BORDER=1>");
out.println("<TR><TD>表单项名（FieldName）</TD><TD>"
+ file.getFieldName() + "</TD></TR>");
out.println("<TR><TD>文件长度（Size）</TD><TD>" +
file.getSize() + "</TD></TR>");
out.println("<TR><TD>文件名（FileName）</TD><TD>"
+ file.getFileName() + "</TD></TR>");
out.println("<TR><TD>文件扩展名（FileExt）</TD><TD>"
+ file.getFileExt() + "</TD></TR>");
out.println("<TR><TD>文件全名（FilePathName）</TD><TD>"
+ file.getFilePathName() + "</TD></TR>");
out.println("</TABLE><BR>");
}
%>
</body>
</html>
