JSP IO流下載檔案

 

<%@page language="java" contentType="application/x-msdownload"  import='java.io.*,java.util.*'   pageEncoding="gb2312"   %><%String filenamedisplay = ""; String type=request.getParameter("type")!=null?request.getParameter("type").trim():"";if(type.equals("1")){filenamedisplay = "paysearch_tracking_code_template.xls"; }else if(type.equals("2")){filenamedisplay = "ao_tracking_code_template.xls"; }else if(type.equals("3")){filenamedisplay = "edm_tracking_code_template.xls"; }else if(type.equals("4")){filenamedisplay = "social_media_tracking_code_template.xls"; }else if(type.equals("5")){filenamedisplay = "online_ad_tracking_code_template.xls"; }else if(type.equals("6")){filenamedisplay = "media_coop_tracking_code_template.xls"; }else{  return;}      java.io.File file = new java.io.File(application.getRealPath("/"+filenamedisplay));   //System.out.println("->"+application.getRealPath("/"+filenamedisplay));   //String context = session.getServletContext().getRealPath("/");   String context2 = application.getRealPath("/"+filenamedisplay);  // System.out.println("===>"+context);if (!file.exists()) {out.println("<script>alert('The file is not exist ! in this path=>"+application.getRealPath("/"+filenamedisplay)+"');window.close();</script>");return;}          // response.setContentType("application/force-download");    response.setHeader("Content-Disposition", "attachment; filename=" + filenamedisplay);     try{           BufferedInputStream   is   =   new   BufferedInputStream(new   FileInputStream(context2));     //InputStream is = application.getResourceAsStream("/"+filenamedisplay);    byte[] byteArray = new byte[10240];    int byteNumber = 0;    int fileLength = 0;           // System.out.println("dddd1");                         ServletOutputStream os = response.getOutputStream();    while ((byteNumber = is.read(byteArray)) != -1)     {            fileLength += byteNumber;    os.write(byteArray, 0, byteNumber);        }                os.flush();                is.close();    os.close();           out.clear();               out = pageContext.pushBody();    }catch (Exception e){    e.printStackTrace(System.out);    }%>

註：<%%><%%>之間不能有空格;