SpringMvc下载excel文件

1. @RequestMapping  
2.     public void download(HttpServletRequest request,  
3.             HttpServletResponse response) throws Exception {  
4.         response.setContentType("text/html;charset=UTF-8");   
5.         BufferedInputStream in = null;  
6.         BufferedOutputStream out = null;  
7.         request.setCharacterEncoding("UTF-8");  
8.         String rootpath = request.getSession().getServletContext().getRealPath(  
9.                 "/");  
10.         String fileName = request.getParameter("f");  
11.         fileName=CommonProperty.getValue(fileName);  
12.         try {  
13.             File f = new File(rootpath + "template/" + fileName);  
14.             response.setContentType("application/x-excel");  
15.             response.setCharacterEncoding("UTF-8");  
16.               response.setHeader("Content-Disposition", "attachment; filename="+fileName);  
17.             response.setHeader("Content-Length",String.valueOf(f.length()));  
18.             in = new BufferedInputStream(new FileInputStream(f));  
19.             out = new BufferedOutputStream(response.getOutputStream());  
20.             byte[] data = new byte[1024];  
21.             int len = 0;  
22.             while (-1 != (len=in.read(data, 0, data.length))) {  
23.                 out.write(data, 0, len);  
24.             }  
25.         } catch (Exception e) {  
26.             e.printStackTrace();  
27.         } finally {  
28.             if (in != null) {  
29.                 in.close();  
30.             }  
31.             if (out != null) {  
32.                 out.close();  
33.             }  
34.         }  
35.   
36.     }