前段時間要做檔案的上傳下載，現在把它寫出來，供大家分享

首先是excel匯出資料庫

@RequestMapping("/exportCustomer")  
    public void exportCustomer(ModelMap model,HttpServletRequest request,HttpServletResponse response) {  
    	SysUser models = UserHelper.getCurrentUser();
        //TODO 如需新增條件  
        //model.addAttribute("username", nameStr);  
        //獲取需要匯出的資料List  
//        List<CMcustomer> cusList=customerService.exportCustomer(model); 
//        List<Units> cusList = unitsService.zTreeAll(models.getId());
    	List<Units> all = unitsService.getAll();
            //使用方法生成excle模板樣式  
        
        HSSFWorkbook workbook = unitsService.createExcel(all, request);  
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); // 定義檔名格式  
  
        try {  
        //定義excle名稱 ISO-8859-1防止名稱亂碼  
            String msg = new String(  
                    ("組織機構資訊_" + format.format(new Date()) + ".xls").getBytes(),  
                    "ISO-8859-1");  
            // 以匯出時間作為檔名  
            response.setContentType("application/vnd.ms-excel");  
            response.addHeader("Content-Disposition", "attachment;filename="  
                    + msg);  
            ServletOutputStream outputStream = response.getOutputStream();
            workbook.write(response.getOutputStream());  
        } catch (IOException e) {  
//            log.error(e);  
        	e.getStackTrace();
        }  
    } 
 

@RequestMapping(value="/formExcel",method = RequestMethod.POST)
	@ResponseBody
	public String formExcel( MultipartFile upExcel ){
		
        try {
			String originalFilename = upExcel.getOriginalFilename();
			if(originalFilename==null){
				return "請選擇要上傳的檔案";
			}
			String uploadPath = "upload/document"+ "/" + UUID.getUUID() + originalFilename.substring(originalFilename.lastIndexOf("."));
		
					FileStorageHelper.transferFile(upExcel.getInputStream(), uploadPath);
					Document document = new Document();
					document.setUrl(uploadPath);
					documentService.save1(document);
					return "上傳檔案成功";
				
		} catch (Exception e) {
			e.printStackTrace();
				
			return "匯入檔案失敗";
		}
	}
 

/**
	    *  下載檔案
	    * @param urldata 檔案路徑
	    * @param response
	    */
	   @RequestMapping("/download")
       public void download(String urldata,HttpServletResponse response){
    	   
		   String rootPath = SpringMVCUtil.getRequest().getSession().getServletContext().getRealPath("/");// 獲取專案根目錄
		   
		    try {
				File file = new File(rootPath+urldata);// path是根據日誌路徑和檔名拼接出來的
				String filename = file.getName();// 獲取日誌檔名稱
				InputStream fis = new BufferedInputStream(new FileInputStream(rootPath+urldata));
				byte[] buffer = new byte[fis.available()];
				fis.read(buffer);
				fis.close();
				response.reset();
				// 先去掉檔名稱中的空格,然後轉換編碼格式為utf-8,保證不出現亂碼,這個檔名稱用於瀏覽器的下載框中自動顯示的檔名
				response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.replaceAll(" ", "").getBytes("utf-8"),"iso8859-1"));
				response.addHeader("Content-Length", "" + file.length());
				OutputStream os = new BufferedOutputStream(response.getOutputStream());
				response.setContentType("application/octet-stream");
				os.write(buffer);// 輸出檔案
				os.flush();
				os.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	   
       }
 

前臺頁面要這樣請求下載的地址

//下載
		function updateLoad(id,name) {
        	
			$.ajax({
				type:"POST",
				url:"/Document/download",
				data:{"urldata":id},
				success:function(msg){
					
					window.open('/Document/download?urldata='+id); 
				}
			});
			
// 			alert(id);
		}