网页下载文件的代码，尽量简单请问怎么写，我的代码不行，大家看看，怎么改谢谢
程序代码：
<%@ page contentType="text/html;charset=UTF-8" %>
<%@ page import = "java.io.*" %>
<%
//防止IE缓存
response.setHeader("pragma","no-cache");
response.setHeader("cache-control","no-cache");
response.setDateHeader("Expires",0);
//设置编码
//request.setCharacterEncoding("UTF-8");
String fileName = new String(request.getParameter("fileName").getBytes("ISO-8859-1"),"UTF-8");
//取到文件
File file = new File(application.getRealPath("/")+"upload/" + fileName);
response.reset();
//response.setContentType("application/octet-stream;charset=UTF-8");
response.setContentType("application/octet-stream;charset=UTF-8");//解决在弹出文件下载框不能打开文件的问题
//System.out.println(response.getCharacterEncoding());
//一定要对fileName进行encode
//response.addHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));
response.addHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("GBK"),"ISO8859-1"));//解决在弹出文件下载框不能打开文件的问题
response.setContentLength((int) file.length());
byte[] buffer = new byte[4096];
BufferedOutputStream output = null;
BufferedInputStream input = null;
//写缓冲区
try {
output = new BufferedOutputStream(response.getOutputStream());
out.clear();
out = pageContext.pushBody();
input = new BufferedInputStream(new FileInputStream(file));
int n = (-1);
while ((n = input.read(buffer, 0, 4096)) > -1) {
output.write(buffer, 0, n);
}
response.flushBuffer();
}
catch (Exception e) {
}
finally {
if (input != null) input.close();
if (output != null) output.close();
}
%>
[ 本帖最后由 sunpei 于 2011-12-9 13:03 编辑 ]
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html 下载文件 网页
----------------解决方案--------------------------------------------------------
我用html写了一个下载的页面，然后调用一个servlet执行下载操作，你看看能帮上你吗
html页面：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>下载页面</title>
</head>
<body>
请选择要下载的文件：<br/>
<form action="/WEBTest/servlet/ServletDemo">
<input type="radio" name="file" value="1.jpg" >文件1<br/>
<input type="radio" name="file" value="2.jpg">文件2<br/>
<input type="submit" value="提交">
</form>
</body>
</html>
servlet：
public class ServletDemo extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//防止IE缓存
response.setHeader("pragma","no-cache");
response.setHeader("cache-control","no-cache");
response.setDateHeader("Expires",0);
response.setHeader("content-disposition", "attachment;filename=");
//设置编码
request.setCharacterEncoding("UTF-8");
String fileName = new String(request.getParameter("file").getBytes("ISO-8859-1"),"UTF-8");
//取到文件完整路径
String path = this.getServletContext().getRealPath(fileName);
InputStream in = null;
OutputStream out = null;
//写缓冲区
try {
in = new FileInputStream(path);
out = response.getOutputStream();
int len = 0;
byte[] buffer = new byte[1024];
while((len = in.read(buffer))>0){
out.write(buffer,0,len);
}
}finally{
if(in!=null)
in.close();
if(out!=null)
out.close();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
----------------解决方案--------------------------------------------------------