1     public void doGet(HttpServletRequest request, HttpServletResponse response) 2             throws ServletException, IOException { 3         doPost(request, response); 4     } 5  6     @SuppressWarnings("deprecation") 7     public void doPost(HttpServletRequest request, HttpServletResponse response) 8             throws ServletException, IOException { 9 10 11         String materia_url=request.getParameter("materia_url");12         String str=request.getRealPath("/")+materia_url;13     14         try {15             downLoad(str, response, false);16         } catch (Exception e) {17             18             e.printStackTrace();19         }20         21     }

public void downLoad(String filePath,HttpServletResponse response,boolean isOnLine)    throws Exception{                File f = new File(filePath);        if(!f.exists()){            response.sendError(404,"---------File not found!");            return;        }        BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));        byte[] buf = new byte[1024];        int len = 0;        response.reset(); //非常重要        if(isOnLine){ //在线打开方式            URL u = new URL("file:///"+filePath);            response.setContentType(u.openConnection().getContentType());            response.setHeader("Content-Disposition", "inline; filename="+f.getName());            //文件名应该编码成UTF-8        }else{ //纯下载方式            response.setContentType("application/x-msdownload");             response.setHeader("Content-Disposition", "attachment; filename=" + f.getName());         }                OutputStream out = response.getOutputStream();        while((len = br.read(buf)) >0)            out.write(buf,0,len);            br.close();            out.close();    }