servlet 小问题

Question

我的超链接<a href='http://localhost:8080/servletPro/Servlet3?filename=Winter >点击下载</a>主要是我想在servlet中实现下载功能  
用
String name=request.getParameter("filename");方法可以得到filename名字 但是
response.setHeader("Content-Disposition","attachment;filename=name");就不好使了 该怎么办啊啊啊

Answer 1

response.setHeader("Content-Disposition","attachment;filename=" + name);

Answer 2

还是不行啊
description The server encountered an internal error () that prevented it from fulfilling this request.exception  java.io.FileNotFoundException: C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\servletPro\image\name (系统找不到指定的文件。)
java.io.FileInputStream.open(Native Method)
java.io.FileInputStream.<init>(FileInputStream.java:106)
java.io.FileInputStream.<init>(FileInputStream.java:66)
com.hsp.servlet.Servlet3.doGet(Servlet3.java:29)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)报了这样一个错 是不是String path=this.getServletContext().getRealPath("/image/name");
这一步也有错呢 

Answer 3

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
String name=request.getParameter("filename");
System.out.println(name);
response.setHeader("Content-Disposition","attachment;filename="+name);
String path=this.getServletContext().getRealPath("/image/name");
//System.out.println("path="+path);
  
FileInputStream fis=new FileInputStream(path);
  
byte buff[]=new byte[1024];
int len=0;
OutputStream os=response.getOutputStream();
while((len=fis.read(buff))>0) {
os.write(buff,0,len);
}
os.close();
fis.close();}