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
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jsp文件实现：download.jsp
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<%@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)
?{
??
?}
??
%>
