工具類：

public static void saveFile(MultipartFile file,HttpServletRequest request,String name) throws IOException{
		
		String path=upload_img_path;
		
		System.out.println("path:"+path);
		
		File folder = new File(path);
        if(!folder.exists()){
        	folder.mkdirs();
        }
        	
		byte[] bytes = file.getBytes();
		BufferedOutputStream stream =new BufferedOutputStream(new FileOutputStream(new File(path+"/"+name)));
		stream.write(bytes);
		stream.close();

	}
 

讀取流顯示圖片 

        @RequestMapping("/image")
	@ResponseBody
	public void getImage(HttpServletRequest request, HttpServletResponse response) throws Exception{
	    String JPG="image/jpeg;charset=GB2312";
	    String iname=request.getParameter("iname");
	    if(!StringUtil.isEmpty(iname)){
		    // 本地檔案路徑
	        String filePath = UploadUtil.upload_img_path+"\\"+iname;
	        File file = new File(filePath);
	        // 獲取輸出流
	        OutputStream outputStream = response.getOutputStream();
	        FileInputStream fileInputStream = new FileInputStream(file);
	        // 讀資料
	        byte[] data = new byte[fileInputStream.available()];
	        fileInputStream.read(data);
	        fileInputStream.close();
	        // 回寫
	        response.setContentType(JPG);
	        outputStream.write(data);
	        outputStream.flush();
	        outputStream.close();
	    }

		
	 
	}