jsp直接让客户端浏览器下载已知类型的文件

<%String filename = "1.txt";
String filepath = "E://";
response.setContentType("APPLICATION/OCTET-STREAM");
response.setHeader("Content-Disposition","attachment; filename=/"1.txt/"");
java.io.FileInputStream fileInputStream =new java.io.FileInputStream(filepath+filename);
int i;
while ((i=fileInputStream.read()) != -1) {
out.write(i); }
fileInputStream.close();
out.close();

response.sendRedirect("/ezIBS");

%>

可以用数组缓冲一下