java如何编写下载功能

    @RequestMapping("/downLoadFailRecord")
    public ModelAndView downLoadFailRecord(
            HttpServletRequest request,HttpServletResponse response,
            @ModelAttribute("filePath")String filePath) throws Exception{
        
        log.info("======文件路径====filePath："+filePath);
        
        String excelData = "";
        
        String str = "医路通保存失败统计记录";
        
        excelData = medicalService.getFailMedical(filePath);
        
        log.info("*******解析的字符串为:"+excelData);
        
        response.setContentType("application/ms-txt;charset=UTF-8"); 
        response.addHeader("Content-Disposition","attachment; filename=" + new String(str.getBytes("GBK"),"ISO8859_1") + ".xls"); 
        response.getWriter().write(excelData);
        return null;
    }

excelData为object类型的数据字符串
方法二:发现的有点晚,还好不算太晚

@RequestMapping(value="downLoadFile")
    public void downLoadFile(HttpServletRequest request, HttpServletResponse response) throws Exception 
    {
        
        //方法二:非常好用的下载文件代码
        String outFileName = "测试文件.xls";
        String filePath="d:/batchInsure.xls";
        /*String outFileName = "测试文件.csv";
        String filePath="d:/secendTest.csv";*/
        
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        ServletOutputStream out = null;
        PrintWriter pw = null;
        FileInputStream fis = null;
        fis = new FileInputStream(filePath);
        response.setHeader("Content-disposition", "attachment;filename="+URLEncoder.encode(outFileName,"UTF-8"));
        out = response.getOutputStream();
        bis = new BufferedInputStream(fis);
        bos = new BufferedOutputStream(out);
        byte[] buff = new byte[2048];
        int len = 0;
        while((len=bis.read(buff))!=-1){
            bos.write(buff,0,len);
        }
        bos.flush();
        out.flush();
    }

方法二非常好用,适合各种类型的文件