springMVC基础

controllers包写控制器：

@Controller
@RequestMapping(value="/utils")
public class UploadController{
    /**
     * 上传文件
     * @return
     * @throws IOException
     * @throws IllegalStateException
     */
    @RequestMapping(value = "/uploadify", method = RequestMethod.POST)
    @ResponseBody
    public String upload(HttpServletRequest request, HttpServletResponse response){
        String responseStr="";
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;    

        Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();
        // 文件保存路径  ctxPat本地路徑
        String ctxPath=request.getSession().getServletContext().getRealPath("/")+File.separator+"uploadFiles";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");
        String ymd = sdf.format(new Date());
        ctxPath += File.separator + ymd + File.separator;
        // 创建文件夹
        File file = new File(ctxPath);
        if (!file.exists()) {
            file.mkdirs();
        }
        String fileName = null;
        for (Map.Entry<String, MultipartFile> entity : fileMap.entrySet()) {
            // 上传文件
            MultipartFile mf = entity.getValue();  

            fileName = mf.getOriginalFilename();
            String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
            // 重命名文件
            //SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
            //String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
            //File uploadFile = new File(ctxPath + newFileName);
            /**
             * modify，文件原名
             */
            File uploadFile = new File(ctxPath + fileName);
            try {
                FileCopyUtils.copy(mf.getBytes(), uploadFile);
                responseStr="上传成功";
            } catch (IOException e) {
                responseStr="上传失败";
                e.printStackTrace();
            }
        }
        return responseStr;
    }
}  

core包写Service接口

services包实现core中的接口，一般不写界面代码，主要和数据库打交道。

entity类是实体，类的字段