down.html代码如下:原理就是通过超链接到一个jsp,通过jsp调用下载的代码
<!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 align="center">
上传文件选择
</p>
<FORM METHOD="POST" ACTION="up.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>
<br>
<br>
<a href="down.jsp" >点击下载</a>
</FORM>
</body>
</html>
down.jsp

<%...@page contentType="text/html; charset=gb2312" language="java" import="java.util.*,com.jspsmart.upload.*,java.lang.*" errorPage="" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'down.jsp' starting page</title>
</head>
<body>
<%...SmartUpload su=new SmartUpload();
su.initialize(pageContext);
su.setContentDisposition(null);//是否自动打开,null为不自动打开
su.downloadFile("c:/jh.cer");
out.clear();
out = pageContext.pushBody();
%>
</body>
</html>
值得主义的是:再<%%>里的后两句
out.clear();
out = pageContext.pushBody();
一定要加上,不然在有些时候会报异常:getOutputStream() has already been called for this response
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