Java file download (with very detailed comments).

Not much to say, direct sticker code:

    File download public static String downloadFile (file file) {HttpServletResponse response = Servletactioncontex            T.getresponse ();             FileInputStream FIS = null;            Bufferedinputstream buff = null;            OutputStream out = null; try {/* If the file exists */if (file.exists ()) {//set to no cache response                   . Reset ();                     Set the encoding method of the response//response.setcontenttype ("Application/x-download"); Response.setcontenttype ("Application/ms-excel"); This sentence is more detailed, tell the browser to download the Excel file//settings download file name Response.setheader ("Content-disposition", "Filena                   Me= "+new String (File.getname (). GetBytes ()," UTF-8 "));                   read out file to I/O stream fis=new fileinputstream (file);                   Buff=new Bufferedinputstream (FIS);                   Get the output stream from the response object, ready to download out = Response.getoutputstream (); //PrintWriter out = Response.getwriter (); I can write anything in bytes.//Writes the contents of int i;                    while ((i = Buff.read ())! =-1) {out.write (i);                  }//Push the contents into the document Out.flush (); }else{return "Download fail";//File Not Present}} catch (Exception e) {//To Do:handle exception}finally{try {if (buff! = null) b                         Uff.close ();                    if (out! = null) out.close ();               } catch (IOException e) {return "download fail";    }} return "Download Success"; }

Java file download (with very detailed comments).