请教高手如何用JavaBean实现文件的下载

[gudu2003]

请教高手如何用JavaBean实现文件的下载，请给一些具体的例子！谢谢!在线等！

[xjhego]

使用SmartUpload組件。
如﹕
<%@ page contentType="text/html; charset=big5" language="java" import="java.sql.*" errorPage="" %><%@ page import="com.jspsmart.upload.*"%><jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.SmartUpload" /><%
String sDocPath = request.getParameter("path");
String sFilename = request.getParameter("filename");
String sSorucePath = null;
if(request.getParameter("action").equals("file")){
sSorucePath = "G:\\Files\\" + sDocPath +"\\";
}else{
sSorucePath = "G:\\Files\\" + sDocPath +"\\Attachments\\";
}

// Initialization
mySmartUpload.initialize(pageContext);

// Download file
//mySmartUpload.downloadFile("/upload/sample.zip");

// With a physical path
//out.println(sSorucePath + sFilename);
mySmartUpload.downloadFile(sSorucePath + sFilename);
// With options
// mySmartUpload.downloadFile("/upload/sample.zip","application/x-zip-compressed","downloaded.zip")
%>

[gudu2003]

再请教一下如何在页面上直接打开Excel文件！谢谢！