Question

如何在jsp页面实现文件下载？？？不要告诉我直接用链接。。。

Answer 1

下面的代码完善，并且简单
Private Sub Command1_Click()
Text2 = ""
For i = 0 To List1.ListCount - 1
Text2 = Val(Text2) + List1.List(i)
Next i
End Sub
Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer)
If KeyCode = 13 Then
If IsNumeric(Text1) Then
List1.AddItem Val(Text1)
Text1 = ""
Else
Text1 = ""
End If
End If
End Sub

Answer 2

1、采用RequestDispatcher的方式进行

jsp页面中添加如下代码：
<%
response.setContentType("application/x-download");//设置为下载application/x-download
String filedownload = "/要下载的文件名";//即将下载的文件的相对路径
String filedisplay = "最终要显示给用户的保存文件名";//下载文件时显示的文件保存名称
filenamedisplay = URLEncoder.encode(filedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filedisplay);

try
{
RequestDispatcher dis = application.getRequestDispatcher(filedownload);
if(dis!= null)
{
dis.forward(request,response);
}
response.flushBuffer();
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{

}
%>

2、采用文件流输出的方式下载

<%@page language="java" contentType="application/x-msdownload" pageEncoding="gb2312"%><%
//关于文件下载时采用文件流输出的方式处理：
//加上response.reset()，并且所有的％>后面不要换行，包括最后一个；

response.reset();//可以加也可以不加
response.setContentType("application/x-download");
String filedownload = "想办法找到要提供下载的文件的物理路径＋文件名";
String filedisplay = "给用户提供的下载文件名";
filedisplay = URLEncoder.encode(filedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filedisplay);

OutputStream outp = null;
FileInputStream in = null;
try
{
outp = response.getOutputStream();
in = new FileInputStream(filenamedownload);

byte[] b = new byte[1024];
int i = 0;

while((i = in.read(b)) > 0)
{
outp.write(b, 0, i);
}
outp.flush();
}
catch(Exception e)
{
System.out.println("Error!");
e.printStackTrace();
}
finally
{
if(in != null)
{
in.close();
in = null;
}
if(outp != null)
{
outp.close();
outp = null;
}
}
%>