<input id="fileUpload" type="file" name="file" data-show-preview="true" multiple/>

var fileName = [];
function initFileInput(id, url) {
    $("#" + id).fileinput({
      language: 'zh', 
      uploadAsync:false,
      uploadUrl:url,
      browseClass: "btn btn-secondary",
      textEncoding:"UTF-8",
      showUpload: false,
      showPreview :true,
      dropZoneEnabled: false,
      maxFileCount:5,
      fileActionSettings:{
        showUpload: true
      },
      enctype:'multipart/form-data',
      msgFilesTooMany: "选择上传的文件数量({n}) 超过允许的最大数值{m}！",
    }).on("filebatchselected", function(event, files) {
      $("#fileUpload").fileinput("upload");
    }).on("filebatchuploadsuccess", function (event, data, previewId, index){
      if(data.response.success == true)
      {
        fileName.push(data.response.fileName);
      }else{
        alert("上传失败!");
      }
      $("#fileUpload").fileinput("clear");
      $("#fileUpload").fileinput("reset");
    }).on('fileerror', function(event, data, msg) {
       alert(msg);
    });
  }

@RequestMapping(value="/fileupload")
  @ResponseBody
  public Map<String, Object> fileUpload(HttpServletRequest request, HttpServletResponse response) {
    ResourceBundle bundle = PropertyResourceBundle.getBundle("application");
    MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request;
    Map<String,MultipartFile> fileMap = multipartRequest.getFileMap();
    String rootPath = bundle.getString("upLoadUrl");
    String filePath = rootPath;
    Map<String, Object> map = new HashMap<>();
    map = uploadFiles(filePath,fileMap);
    return map;
  }

public Map<String, Object> uploadFiles(String savePath,Map<String,MultipartFile> fiLeMap){
    Map<String, Object> map = new HashMap<>();
    try {
      String fileName = "";
      if(fiLeMap!=null){
        for(Map.Entry<String, MultipartFile> entity:fiLeMap.entrySet()){
          MultipartFile f = entity.getValue();
          if(f != null && !f.isEmpty()){
            String uuid = UUID.randomUUID().toString();
            fileName = uuid + "#" + f.getOriginalFilename();
            File newFile = new File(savePath + "/" + fileName); 
            f.transferTo(newFile);
          }
        }
      }
      map.put("success", true);
      map.put("fileName", fileName);
      return map;
    }catch (Exception e) {
      map.put("success", false);
      return map;
   }
}

$.ajax({
      type: "POST",
      url: 所需要请求地址,
      dataType: "json",
      traditional:true,
      data: {
        service:$("#service").select2('val').replace("All",""),
        startTime:$("#start").val(),
        endTime:$("#end").val(),
        reason:$("#reason").val(),
        fileName:JSON.stringify(fileName),
        outterEmail:isOutterEmail,
        innerEmail:isInnerEmail,
        isSendEmail:isSendEmail,
        subService:$("#subService").select2('val'),
        runningStatus:$("#runningStatus").select2('val')
      },
      success: function(data){
        $("#loadingModal").modal("hide");
        fileName.splice(0,fileName.length);
        alert(data.msg);
        if(data.success) {
          location.href = "revision";
        }
      },
      error:function(xhr) {
        $("#loadingModal").modal("hide");
        alert("保存失败");
      }
    });