JSP 文件 下载 代码 (不使用 jsp smart upload 组件) 解决中文名 问题

代码如下：

<%@page language="java" contentType="application/x-msdownload" pageEncoding="gb2312"%> <%@ page import = " java.io.*, java.util.*, java.net.*"%> <% response.reset(); response.setContentType("application/force-download"); String file = request.getParameter("file"); String filename=request.getSession().getServletContext().getRealPath(file); File f = new File(filename); if (f.exists() && f.canRead()) { String downFileName = new String(f.getName().getBytes(),"ISO-8859-1"); String filedownload = filename; String filedisplay = downFileName; response.addHeader("Content-Disposition","attachment;filename=" + filedisplay); OutputStream outp = null; FileInputStream in = null; try { outp = response.getOutputStream(); in = new FileInputStream(filename); byte[] b = new byte[1024]; int i = 0; while((i = in.read(b)) > 0) { outp.write(b, 0, i); } outp.flush(); out.clear(); out = pageContext.pushBody(); } catch(Exception e) { System.out.println("Error!"); e.printStackTrace(); } finally { if(in != null) { in.close(); in = null; } } }else{ String str="<mce:script language='javascript'><!-- "; str+="function showmsg(){alert(/"您要下载的文件不存在！/");}"; str+="showmsg(); // --></mce:script>"; out.println(str); } %>