SpringBoot+layui实现文件上传功能

<fieldset class="layui-elem-field layui-field-title" style="margin-top: 30px;">
 <legend>多文件列表上传</legend>
</fieldset> 
<div class="layui-upload">
 <button type="button" class="layui-btn layui-btn-normal" id="testList">选择多文件</button> 
 <div class="layui-upload-list">
  <table class="layui-table">
   <thead>
    <tr><th>文件名</th>
    <th>大小</th>
    <th>状态</th>
    <th>操作</th>
   </tr></thead>
   <tbody id="demoList"></tbody>
  </table>
 </div>
 <button type="button" class="layui-btn" id="testListAction">开始上传</button>
</div>

layui.use('upload', function(){
 var $ = layui.jquery
 ,upload = layui.upload;
 //多文件列表示例
 var demoListView = $('#demoList')
 ,uploadListIns = upload.render({
  elem: '#testList'
  ,url: 'upload/uploadFile'
  ,accept: 'file'
  ,multiple: true
  ,auto: false
  ,size: 5120
  ,bindAction: '#testListAction'
  ,choose: function(obj){  
   var files = this.files = obj.pushFile(); //将每次选择的文件追加到文件队列
   //读取本地文件
   obj.preview(function(index, file, result){
    var tr = $(['<tr id="upload-'+ index +'">'
     ,'<td>'+ file.name +'</td>'
     ,'<td>'+ (file.size/1014).toFixed(1) +'kb</td>'
     ,'<td>等待上传</td>'
     ,'<td>'
      ,'<button class="layui-btn layui-btn-mini demo-reload layui-hide">重传</button>'
      ,'<button class="layui-btn layui-btn-mini layui-btn-danger demo-delete">删除</button>'
     ,'</td>'
    ,'</tr>'].join(''));
    //单个重传
    tr.find('.demo-reload').on('click', function(){
     obj.upload(index, file);
    });
    //删除
    tr.find('.demo-delete').on('click', function(){
     delete files[index]; //删除对应的文件
     tr.remove();
     uploadListIns.config.elem.next()[0].value = ''; //清空 input file 值，以免删除后出现同名文件不可选
    });
    demoListView.append(tr);
   });
  }
  ,done: function(res, index, upload){
   if(res.code == 0){ //上传成功
    var tr = demoListView.find('tr#upload-'+ index)
    ,tds = tr.children();
    tds.eq(2).html('<span style="color: #5FB878;">上传成功</span>');
    tds.eq(3).html(''); //清空操作
    return delete this.files[index]; //删除文件队列已经上传成功的文件
   }
   this.error(index, upload);
  }
  ,error: function(index, upload){
   var tr = demoListView.find('tr#upload-'+ index)
   ,tds = tr.children();
   tds.eq(2).html('<span style="color: #FF5722;">上传失败</span>');
   tds.eq(3).find('.demo-reload').removeClass('layui-hide'); //显示重传
  }
 });
});

 public final static String UPLOAD_FILE_PATH = "D:\\uploadFile\\";
  @RequestMapping(value = "uploadFile")
  public String uploadImage(@RequestParam("file") MultipartFile file) {
    if (!file.isEmpty()) {
      Map<String, String> resObj = new HashMap<>(MAP_SIZE);
      try {
        BufferedOutputStream out = new BufferedOutputStream(
            new FileOutputStream(new File(UPLOAD_FILE_PATH, file.getOriginalFilename())));
        out.write(file.getBytes());
        out.flush();
        out.close();
      } catch (IOException e) {
        resObj.put("msg", "error");
        resObj.put("code", "1");
        return JSONObject.toJSONString(resObj);
      }
      resObj.put("msg", "ok");
      resObj.put("code", "0");
      return JSONObject.toJSONString(resObj);
    } else {
      return null;
    }
  }