记录3种jsp下载文件的方法

<% response.setContentType("application/x-download");//设置为下载application/x-download String filedownload = "/要下载的文件名";//即将下载的文件的相对路径 String filedisplay = "最终要显示给用户的保存文件名";//下载文件时显示的文件保存名称 String filenamedisplay = URLEncoder.encode(filedisplay,"UTF-8"); response.addHeader("Content-Disposition","attachment;filename=" + filedisplay); try { RequestDispatcher dis = application.getRequestDispatcher(filedownload); if(dis!= null) { dis.forward(request,response); } response.flushBuffer(); } catch(Exception e) { e.printStackTrace(); } finally { } %>

<%@page language="java" contentType="application/x-msdownload" pageEncoding="gb2312"%> <% //关于文件下载时采用文件流输出的方式处理： //加上response.reset()，并且所有的％>后面不要换行，包括最后一个； response.reset();//可以加也可以不加 response.setContentType("application/x-download"); //application.getRealPath("/main/mvplayer/CapSetup.msi");获取的物理路径 String filedownload = "想办法找到要提供下载的文件的物理路径＋文件名"; String filedisplay = "给用户提供的下载文件名"; String filedisplay = URLEncoder.encode(filedisplay,"UTF-8"); response.addHeader("Content-Disposition","attachment;filename=" + filedisplay); java.io.OutputStream outp = null; java.io.FileInputStream in = null; try { outp = response.getOutputStream(); in = new FileInputStream(filenamedownload); byte[] b = new byte[1024]; int i = 0; while((i = in.read(b)) > 0) { outp.write(b, 0, i); } // outp.flush(); //要加以下两句话，否则会报错 //java.lang.IllegalStateException: getOutputStream() has already been called for //this response out.clear(); out = pageContext.pushBody(); } catch(Exception e) { System.out.println("Error!"); e.printStackTrace(); } finally { if(in != null) { in.close(); in = null; } //这里不能关闭 //if(outp != null) //{ //outp.close(); //outp = null; //} } %>

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <a href="do_download.jsp?url=xxxxxx">点击下载 千千动听</a> <%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <%@page import="com.jspsmart.upload.SmartUpload"%> <% SmartUpload su=new SmartUpload(); su.initialize(pageContext); su.setContentDisposition(null);//禁止浏览器打开文件 只能下载 su.downloadFile("upload/1.txt"); //out.clear(); //out=pageContext.pushBody(); %>