Spring mvc 多文件上传 controller+freemarker +js（随时拿来用）

controller:
//批量导入 法源信息(多文件上传)
  @RequestMapping(value = "/addlot")
    public String addlot(@RequestParam MultipartFile[] myfiles,
            HttpServletRequest request, HttpSession httpSession,
            RedirectAttributesModelMap model) throws IOException {
        List<YellowpagesitemDO> list = new ArrayList<YellowpagesitemDO>();
        String parentId = (String) httpSession.getAttribute(SESSION_LAW02_PARENTID);
        int ok = 0;
        int no = 0;
        int total = 0;
        // 如果只是上传一个文件，则只需要MultipartFile类型接收文件即可，而且无需显式指定@RequestParam注解
        // 如果想上传多个文件，那么这里就要用MultipartFile[]类型来接收文件，并且还要指定@RequestParam注解
        // 并且上传多个文件时，前台表单中的所有<input type="file"/>的name都应该是myfiles，否则参数里的myfiles无法获取到所有上传的文件
        for (MultipartFile myfile : myfiles) {
            YellowpagesitemDO yellowpagesitemDO = new YellowpagesitemDO();
            boolean flag = false;
          
            if (myfile.isEmpty()) {
                System.out.println("文件未上传");
            } else {
                total = total + 1;
                String filename = myfile.getOriginalFilename();
                if ((filename != null) && (filename.length() > 0)) {
                    // 查找字符‘.‘出现的最后一个索引位置
                    int x = filename.lastIndexOf('.');
                    // 判断此索引是否存在，并且不是最后一个字符
                    if ((x > -1) && (x < filename.length() - 1)) {
                        if (filename.substring(x + 1).equals("html")
                                || filename.substring(x + 1).equals("htm")) {// 调用subString方法从索引位开始截取到最后，并且不截取字符'.'
                            flag = true;

                        }
                        ;

                    }
                }
                if (flag) {
                  
                    String path3 = request.getSession().getServletContext().getRealPath("")+ "\\views\\law02\\" + parentId;
                 
                    File targetFile = new File(path3,myfile.getOriginalFilename());
                    if (!targetFile.exists()) {
                        targetFile.mkdirs();
                    }

                    try {
                        myfile.transferTo(targetFile);
                        yellowpagesitemDO.setName(myfile.getOriginalFilename());
                        yellowpagesitemDO.setValue("添加成功！");
                        list.add(yellowpagesitemDO);
                        ok = ok + 1;
                        String content=path3+"\\"+myfile.getOriginalFilename();
                        LawDO llDo=law01Service.getlaw(content);
                        if(llDo!=null){
                            
                        }else {
                            LawDO  lawDO =new  LawDO();
                            lawDO.setContent(content);
                            lawDO.setDelFlag(0);
                            law01Service.insertLaw(lawDO);
                        }
                        
                    }catch(Exception e){
                        //e.printStackTrace();
                    }
                } else {
                    no = no + 1;
                    yellowpagesitemDO.setName(myfile.getOriginalFilename());
                    yellowpagesitemDO.setValue("格式错误，导入失败！");
                    list.add(yellowpagesitemDO);
                }
            }
        }
        model.addAttribute("id", parentId);
        model.addFlashAttribute("total", total);
        model.addFlashAttribute("no", no);
        model.addFlashAttribute("ok", ok);
        model.addFlashAttribute("mess", list);
        return "redirect:/law02/show";
    }

Freemarker:
<h1>批量导入 :</h1><br/>

  <form  id="uploadForm"  name ="uploadForm"  method ="post"  action ="${base}/law02/addlot"  enctype ="multipart/form-data"   >
             <p><input  type ="button"  value ="增加上传按钮"  onclick ="addUploadButton()" /></p>
             <p><input id ="files" type ="file"  name ="myfiles"  value ="浏览文件"   /></p>
                
             </form >
<button id="lotsub" class="button bg-main">提交</button> 
</br>
<hr class="bg-gray" />
<h1>批量导入信息反馈 :</h1>
<br/>
<#if total??>
<h1>共计导入 : ${total!}条,    成功 ：${ok!}条,    失败 ：${no!}条 </h1>
<br/>
</#if>
<table class="table table-bordered table-striped">
<tbody>
            <tr>
                <th width="30%">导入内容</th>
                <th width="30%">导入状态</th>
            </tr>
<#list mess! as x>
<tr>
<td>${x.name!}</td>
<td>${x.value!}</td>
</tr>

</#list>
    </tbody>
    </table>

$('#lotsub').click(function() {
        
         var files = $('#files').val();
        if(files =="" ){
            alert("请添加文件");
            return false ;
        }
        else{
            $('form').submit();
        }
    });
    


    function  addUploadButton(){ 
        
         //  按ID找到FOrm
         var  uploadForm = document.getElementById( "uploadForm" );    
        
         //  创建P元素
         var  pNode = document.createElement( "p" );
        
         //  累加Count以观察次数
        
        pNode.innerHTML = " <input type='file' name='myfiles' value='浏览文件'/> " ;
        
         //  将P元素添加到body中
        uploadForm.appendChild(pNode);
    }