SpringMVC 使用 MultipartFile 实现文件上传

该代码实现了文件上传和文本字段同时传递到后台进行处理的功能。

直接贴代码，中间涉及到的实体类就不贴了，和功能没啥关系的。

Controller

 1     /**
 2      * 添加活动
 3      * 
 4      * @param req
 5      * @param file1
 6      * @param file2
 7      * @return
 8      */
 9     @RequestMapping(value = "/addActivity", method = RequestMethod.POST)
10     public JSONObject addActivity(HttpServletRequest req, @RequestParam(value = "file1") MultipartFile file1,
11             @RequestParam(value = "file2") MultipartFile file2) {
12         logger.info("enter into method addActivity");
13         StatusCode statusCode = activityService.addActivity(req, file1, file2);
14         return new ResultBuilder<>(statusCode).toJSONObject();
15     }

Service

  1     /**
  2      * 添加活动
  3      * @param req
  4      * @param file1
  5      * @param file2
  6      * @return
  7      */
  8     public StatusCode addActivity(HttpServletRequest req, MultipartFile file1, MultipartFile file2) {
  9         try {
 10             //从request中获取上传的文件
 11             /*if(file1 == null){
 12                 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)req;
 13                 file1 = multipartRequest.getFile("file1");
 14             }
 15             if(file2 == null){
 16                 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)req;
 17                 file2 = multipartRequest.getFile("file2");
 18             }*/
 19             
 20             if (file1 == null || file2 == null) {
 21                 logger.info("the file is null");
 22                 return StatusCode.FILE_IS_NULL;
 23             }
 24             
 25             String filepath1 = uploadFile(file1);
 26             String filepath2 = uploadFile(file2);
 27             if (filepath1 == null || filepath2 == null) {
 28                 logger.info("the file upload fail");
 29                 return StatusCode.FILE_UPLOAD_FAIL;
 30             }
 31             
 32             String activityname = req.getParameter("activityname");//活动名称
 33             String winrate = req.getParameter("winrate");//中奖率
 34             String expectedwinners = req.getParameter("expectedwinners");//预期中奖人数
 35             String daysnum = req.getParameter("daysnum");//每天首次访问小程序可获得的抽奖次数
 36             String firstnum = req.getParameter("firstnum");//首次关注公众号可获得的抽奖次数
 37             String sharelimitnum = req.getParameter("sharelimitnum");//每日分享最多可获得的抽奖次数
 38             String friendclicknum = req.getParameter("friendclicknum");//每日好友点击最多可获得的抽奖次数
 39             String ruledesc = req.getParameter("ruledesc");//规则描述
 40             String starttime = req.getParameter("starttime");//开始时间
 41             String endtime = req.getParameter("endtime");//结束时间
 42             String prizename = req.getParameter("prizename");//奖品名称
 43             String prizeprice = req.getParameter("prizeprice");//奖品价格
 44             String cardid = req.getParameter("cardid");//卡片ID
 45             
 46             if (StringUtils.isNullOrEmpty(activityname) || StringUtils.isNullOrEmpty(expectedwinners) || StringUtils.isNullOrEmpty(daysnum)
 47                     || StringUtils.isNullOrEmpty(firstnum) || StringUtils.isNullOrEmpty(sharelimitnum) || StringUtils.isNullOrEmpty(friendclicknum)
 48                     || StringUtils.isNullOrEmpty(ruledesc) || StringUtils.isNullOrEmpty(starttime) || StringUtils.isNullOrEmpty(endtime)
 49                     || StringUtils.isNullOrEmpty(prizename) || StringUtils.isNullOrEmpty(prizeprice) || StringUtils.isNullOrEmpty(cardid)
 50                     || StringUtils.isNullOrEmpty(winrate)) {
 51                 logger.info("the paramter is null or empty");
 52                 return StatusCode.REQUEST_PARAM_ERROR;
 53             }
 54             
 55             if (Long.parseLong(starttime) >= Long.parseLong(endtime)) {
 56                 logger.info("the starttime less than or equal to endtime");
 57                 return StatusCode.ACTIVITY_TIME_ERROR;
 58             }
 59             
 60             Activity activity = new Activity();
 61             activity.setActivityname(activityname);
 62             activity.setCoverimage(filepath1);
 63             activity.setThumbnail(filepath2);
 64             activity.setWinrate(Double.valueOf(winrate));
 65             activity.setExpectedwinners(Integer.valueOf(expectedwinners));
 66             activity.setDaysnum(Integer.valueOf(daysnum));
 67             activity.setFirstnum(Integer.valueOf(firstnum));
 68             activity.setSharelimitnum(Integer.valueOf(sharelimitnum));
 69             activity.setFriendclicknum(Integer.valueOf(friendclicknum));
 70             activity.setRuledesc(ruledesc);
 71             activity.setStarttime(new Date(Long.parseLong(starttime)));
 72             activity.setEndtime(new Date(Long.parseLong(endtime)));
 73             activity.setPrizename(prizename);
 74             activity.setPrizeprice(Double.valueOf(prizeprice));
 75             activity.setCardid(Integer.valueOf(cardid));
 76             
 77             int result = activityMapper.addActivity(activity);
 78             if (result != 1) {
 79                 logger.info("add activity fail");
 80                 return StatusCode.ADD_ACTIVITY_FAIL;
 81             }
 82         } catch (Exception e) {
 83             logger.error("add activity error", e);
 84             return StatusCode.FAIL;
 85         }
 86         return StatusCode.SUCCESS;
 87     }
 88     
 89     /**
 90      * 文件上传
 91      * @param file
 92      * @param savepath
 93      * @return
 94      */
 95     public String uploadFile(MultipartFile file){
 96         String savepath = Constants.UPLOAD_FILE_IMAGE_SAVE_PATH;
 97         File filedir = new File(savepath);
 98         //如果文件夹不存在则创建    
 99         if (!filedir.exists()) {
100             logger.info("create directory:{}", savepath);
101             try{
102                 filedir.mkdirs();
103             }catch(Exception e){
104                 logger.error("create directory fail", e);
105                 return null;
106             }
107         }
108         
109         SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
110         String nowdate = sdf.format(new Date(System.currentTimeMillis()));
111         
112         String originalfilename = file.getOriginalFilename();
113         if (originalfilename == null || !originalfilename.contains(".")) {
114             logger.info("file name is error:{}", originalfilename);
115             return null;
116         }
117         String suffix = originalfilename.substring(originalfilename.indexOf("."));
118         String filepath = savepath + nowdate + suffix;
119         
120         File targetFile = new File(filepath);
121         try {
122             file.transferTo(targetFile);
123         } catch (Exception e) {
124             logger.error("file upload fail", e);
125             return null;
126         }
127         return filepath;
128     }

使用FORM的话需要指定enctype="multipart/form-data"

附上我测试用的form表单

 1   <form action="http://localhost:8080/activity/addActivity" method="post" enctype="multipart/form-data">
 2     activityname<input type="text" name="activityname" value="第一个测试活动"/><br>
 3     expectedwinners<input type="text" name="expectedwinners" value="100"/><br>
 4     daysnum<input type="text" name="daysnum" value="3"/><br>
 5     firstnum<input type="text" name="firstnum" value="5"/><br>
 6     sharelimitnum<input type="text" name="sharelimitnum" value="6"/><br>
 7     friendclicknum<input type="text" name="friendclicknum" value="7"/><br>
 8     ruledesc<input type="text" name="ruledesc" value="这里简单描述下规则，自己写啊。"/><br>
 9     starttime<input type="text" name="starttime" value="1519292136927"/><br>
10     endtime<input type="text" name="endtime" value="1519293136927"/><br>
11     prizename<input type="text" name="prizename" value="笔记本电脑"/><br>
12     prizeprice<input type="text" name="prizeprice" value="5999.56"/><br>
13     cardid<input type="text" name="cardid" value="1"/><br>
14     <input type="file" name="file1"/><br>
15     <input type="file" name="file2"/><br>
16     <input type="submit" value="提交"/>
17   </form>