文件下载

  //文件下载 主要方法
	  public static void download(HttpServletRequest request,HttpServletResponse response, String storeName, String contentType) throws Exception {  
	    request.setCharacterEncoding("UTF-8");  
	    BufferedInputStream bis = null;  
	    BufferedOutputStream bos = null;  
	
	    //获取项目根目录
	    String ctxPath = request.getSession().getServletContext().getRealPath("/resource/img/"); 
	    
	    //获取下载文件路径
	    String downLoadPath = ctxPath+"/"+storeName;  
	  
	    //获取文件的长度
	    long fileLength = new File(downLoadPath).length();  

	    //设置文件输出类型
	    response.setContentType("application/octet-stream");  
	    response.setHeader("Content-disposition", "attachment; filename="+ new String(storeName.getBytes("utf-8"), "ISO8859-1")); 
	    //设置输出长度
	    response.setHeader("Content-Length", String.valueOf(fileLength));  
	    //获取输入流
	    bis = new BufferedInputStream(new FileInputStream(downLoadPath));  
	    //输出流
	    bos = new BufferedOutputStream(response.getOutputStream());  

	    byte[] buff = new byte[2048]; 
 
	    int bytesRead;  
	    while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {  
	      bos.write(buff, 0, bytesRead);  
	    }  
	    //关闭流
	    bis.close();  
	    bos.close();  
	  }

//重定向下载文件
	@RequestMapping("admin/dowm")
	public ModelAndView download(HttpServletRequest request,HttpServletResponse response) throws Exception {
	    String storeName=request.getParameter("filename");
	    String contentType = "application/octet-stream";  
	  　　 download(request, response, storeName, contentType);  
	    return null;  
	  }