A brief discussion on the download function in JSP pages

js| Download | page If just under a file, directly with a hyperlink can be done but the chain is not safe, who can access, with the program of course good, but the Web can not access the directory of the file download to the authenticated visitors.

I have previously written an example of taking pictures out of the database and pushing them to the page.
You simply change the data source from the database to a data source read from a file, and then

"Image/gif"
Instead of "Application/x-msdownload", you can output a file to a browser.


File t_file = new Java.io.File (sourcefilepathname);
Long L = t_file.length (); File length
InputStream in = new FileInputStream (t_file);
if (in!= null)
{
String fs = T_file.getname ();
Response.reset ();
Response.setcontenttype ("Application/x-msdownload"); //
String s = "attachment;" Filename= "+FS; //
Response.setheader ("Content-disposition", s); Above output file meta information
Response.setcontentlength ((int) l); Set input file length
Byte[] B = new byte[2048];
int len = 0;
while ({Len=in.read (b)) >0);
{
Response.getoutputstream (). write (B,0,len); Output to browser \ r
}
In.close (); Close file input stream \ r
}