Upload excel file(template) using angular JS Ajax call and Read its contents in Java controller

In your HTML file create a file input and button

<input name="fileupload" type="file" file-model="fileupload">
<button ng-click="uploadFile()" class="btn btn-primary">Upload File</button>

In your script file controller function:

myApp.directive('fileModel', ['$parse', function ($parse) {
    return {
        restrict: 'A',
        link: function(scope, element, attrs) {
            var model = $parse(attrs.fileModel);
            var modelSetter = model.assign;
           
            element.bind('change', function(){
                scope.$apply(function(){
                    modelSetter(scope, element[0].files[0]);
                });
            });
        }
    };
}]);


myApp.service('fileUpload', ['$http', function ($http) {
    this.uploadFileToUrl = function(file, uploadUrl){
        var fd = new FormData();
        fd.append('file', file);
        return $http.post(uploadUrl, fd, {
            transformRequest: angular.identity,
            headers: {'Content-Type': undefined}
        })
    }
}]);

myApp.controller('fileController',function($scope,$http,fileUpload){
$scope.uploadFile = function(){
            var file = $scope.fileupload;
         
            var uploadUrl = "../uploadFile";
            fileUpload.uploadFileToUrl(file, uploadUrl)
            .then(function(response) {
                console.log(response) ;
                $scope.fileData= response.data;
                })
           
         };
)};
        
 IN java controller

@RequestMapping(value="uploadFile", method = RequestMethod.POST)
    public @ResponseBody String uploadFile(@RequestParam(value="file", required=true) MultipartFile file,HttpServletRequest request) throws IOException, ParseException {
       
        String fileName=file.getOriginalFilename();
        final ServletContext servletContext = request.getSession().getServletContext();
        final File tempDirectory = (File) servletContext.getAttribute("javax.servlet.context.tempdir");
        final String saveDirectory = tempDirectory.getAbsolutePath();
              
        int i = 1;
        // Creates a workbook object from the uploaded excelfile
        XSSFWorkbook workbook = new XSSFWorkbook(file.getInputStream());
        // Creates a worksheet object representing the first sheet
        XSSFSheet worksheet = workbook.getSheetAt(0);
        // Reads the data in excel file until last row is encountered
        while (i <= worksheet.getLastRowNum()) {
            // Creates an object for the UserInfo Model
           
            // Creates an object representing a single row in excel
            XSSFRow row = worksheet.getRow(i++);
            System.out.println("File: " + row.getCell(7).getDateCellValue() + row.getCell(8).getDateCellValue()
              + " ----!");
                       
           
           
       
                String dateStringInUse = row.getCell(7).getDateCellValue().toString();
               
                SimpleDateFormat parseFormat = new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy");
                Date dateInUse = parseFormat.parse(dateStringInUse);

                SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
                String useDate = format.format(dateInUse);
 //assign value to a list model
              list.add(Model); 
          }

        String jsonStr=null;
        Gson gson = new Gson();
        jsonStr = gson.toJson(list);
        System.out.println(jsonStr);
        return jsonStr;
       
    }