在Struts 2中使用jquery ajax上傳單個和多個文件

Question

如何使用ajax jQuery上傳文件，並在struts2中上傳時顯示進度條，我搜索了所有沒有運氣的人可以給我提供想法或一些代碼片段的代碼。謝謝。現在，我正在使用html這樣的普通上傳。

<a id="addFile-link" href="#" title="add file"><img src="htdocs/images/add_file.png" style="width: 20px; height: 20px; border: 0"></a> 
                 <form id="form" name="form" target="viewFileUpload" method="post"
                action="fileUpload.do" enctype="multipart/form-data">
                <input type="file" name="upload" id="file" class="fileUpload" multiple>

                 </form>


  $("#addFile-link").click(function() {
var initialFolderId = document.getElementById('currentFolder').value;
            //Added for converting first time page load null or empty value validation in Servelet engine
            if (initialFolderId == null || initialFolderId == "") {
                initialFolderId = 0;
            }

            document.getElementById('selectedFolder').value = initialFolderId;
            $("#file").click();
            var uploadElement = document.getElementById("file");
            $('#file').change(function() {

                uploadElement.form.submit();

                //sleep(100)
                setTimeout(function() {openFolder(document.getElementById('currentFolder').value);getRecentActivity(0);}, 3000);
                $('#Activites').html(""); 

            });
        });

Answer 1

$('#addFile-link').bind("click",function(){
        var FolderId

        FolderId=document.getElementById('currentFolder').value;
        document.getElementById('selectedFolder').value = FolderId;

        if( FolderId==" " || FolderId==0){
            $('#input').prop('disabled', true);
            showFileMSg();
            //alert("kindly select a folder to upload files");

        }
        else{

            $('#input').prop('disabled', false);
        $('#fileupload').fileupload({
         xhrFields: {withCredentials: true},
            url: "fileUpload.do?",
            type:"POST",
            dataType : "JSON",
            autoUpload: true,
           formdata:{name:'FolderId',value:FolderId},
           disableImagePreview:true,
           filesContainer: $('table.files'),
           uploadTemplateId: null,
           downloadTemplateId: null,
           uploadTemplate: function (o) {
               var rows = $();
               $.each(o.files, function (index, file) {
                   var row = $('<tr class="template-upload fade">' +
                       '<td><span class="preview"></span></td>' +
                       '<td><p class="name"></p>' +
                       '<div class="error"></div>' +
                       '</td>' +
                       '<td><p class="size"></p>' +
                       '<div class="progress"></div>' +
                       '</td>' +
                       '<td>' +
                       (!index && !o.options.autoUpload ?
                           '<button class="start" disabled>Start</button>' : '') +
                       (!index ? '<button class="cancel">Cancel</button>' : '') +
                       '</td>' +
                       '</tr>');
                   row.find('.name').text(file.name);
                   row.find('.size').text(o.formatFileSize(file.size));
                   if (file.error) {
                       row.find('.error').text(file.error);
                   }
                   rows = rows.add(row);
               });
               return rows;
           },
           downloadTemplate: function (o) {
               var rows = $();
               $.each(o.files, function (index, file) {
                   var row = $('<tr class="template-download fade">' +
                       '<td><span class="preview"></span></td>' +
                       '<td><p class="name"></p>' +
                       (file.error ? '<div class="error"></div>' : '') +
                       '</td>' +
                       '<td><span class="size"></span></td>' +
                       '<td><button class="delete">Delete</button></td>' +
                       '</tr>');
                   row.find('.size').text(o.formatFileSize(file.size));
                   if (file.error) {
                       row.find('.name').text(file.name);
                       row.find('.error').text(file.error);
                   } else {
                       row.find('.name').append($('<a></a>').text(file.name));
                       if (file.thumbnailUrl) {
                           row.find('.preview').append(
                               $('<a></a>').append(
                                   $('<img>').prop('src', file.thumbnailUrl)
                               )
                           );
                       }
                       row.find('a')
                           .attr('data-gallery', '')
                           .prop('href', file.url);
                       row.find('button.delete')
                           .attr('data-type', file.delete_type)
                           .attr('data-url', file.delete_url);
                   }
                   rows = rows.add(row);
               });
               return rows;
           },
           always:function (e, data) {
               $.each( function () {
                   $(this).removeClass('fileupload-processing');
               });

           },
           done: function (e, data) {
               $('.template-upload').remove();
               $.each(data.files, function (index, file) {
                   openFolder(FolderId);
               });

           },
           error: function (jqXHR, textStatus, errorThrown) {
               alert("jqXHR: " + jqXHR.status + "\ntextStatus: " + textStatus + "\nerrorThrown: " + errorThrown);
           }



             /*add: function (e, data) {
            $('body').append('<p class="upl">Uploading...</p>')
            data.submit();
        },*/
    })

        }

    });




<form id="fileupload" on action="fileUpload.do" method="POST" enctype="multipart/form-data">
                                        <input id="input" type="file" name="upload" multiple style="cursor: pointer;  display: none">
                                        <im:hidden name="selectedFolder" id="selectedFolder" value="1" />
                                         <span class="fileupload-process"></span>
                                 <div class="col-lg-5 fileupload-progress fade">
                                     <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
                                       <div class="progress-bar progress-bar-info" style="width:0%;"></div>
                                    </div>
                                       <div class="progress-extended">&nbsp;</div>
                                 </div>
                  <table role="presentation" class="table table-striped"><tbody class="files"></tbody></table>
              </form>