公共的文件下载页面实现！

在web系统中我们通常需要下载文件，我们可以通过页面跳转相应的download.jsp页面来实现，只需要在action中或者url中添加获取文件名称的参数即可。实现如下

 

jsp文件实现：download.jsp

 

<%@page language="java" contentType="application/x-msdownload"   pageEncoding="gb2312"%>
<%@page import ="java.io.*,java.net.*"%>
<%
 try{
  String fileName = (String)request.getParameter("fileName");
     String filePath = application.getRealPath("/report/" + fileName);
  response.setContentType("application/x-download");
  String fn = fileName.substring(fileName.lastIndexOf("/")+1, fileName.length());
  fn = URLEncoder.encode(fn,"UTF-8");
  response.addHeader("Content-Disposition","attachment;filename=" + fn);
  OutputStream outputStream = response.getOutputStream();
  InputStream inputStream = new FileInputStream(filePath);
  byte[] buffer = new byte[1024];
  int i = -1;
  while ((i = inputStream.read(buffer)) != -1) {
   outputStream.write(buffer, 0, i);
  }
  outputStream.flush();
  outputStream.close();
  inputStream.close();
  outputStream = null;
 }catch(Exception e)
 {
  
 }
  
%>