Question

JSP 下载服务器文件

采用文件流输出的方式下载
1、web.xml
<mime-mapping>
<extension>doc</extension>
<mime-type>application/vnd.ms-word</mime-type>
</mime-mapping>
2、程序如下：
<%@page language="java" contentType="application/x-msdownload" import="java.io.*,java.net.*" pageEncoding="gb2312"%>
<%
response.reset();
response.setContentType("application/x-download");
String filenamedownload = this.getClass().getClassLoader().getResource("/").getPath() + "/../../系统解决方案.doc";
String filenamedisplay = "系统解决方案.doc";
filenamedisplay = URLEncoder.encode(filenamedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filenamedisplay);
OutputStream output = null;
FileInputStream fis = null;
try
{ output = response.getOutputStream();
fis = new FileInputStream(filenamedownload);
byte[] b = new byte[1024];
int i = 0;
while((i = fis.read(b)) > 0)
{
output.write(b, 0, i);
}
output.flush();
}
catch(Exception e)
{
System.out.println("Error!");
e.printStackTrace(); }
finally
{
if(fis != null)
{
fis.close();
fis = null;
}
if(output != null)
{
output.close();
output = null;
} }
%>
JSP头加了该代码。下面html要怎么写，点击按钮下载？filenamedownload路径是什么意思？绝对还是相对的？

Answer 1

你如果要用流的话就写一个按钮事件吧，点击后调用下载方法。最简单的下载实现，就是写一个链接标签，用浏览器自带的下载功能。<a href='a.txt'>下载<a/>