在Struts 2中使用jquery ajax上传单个和多个文件

Question

如何使用ajax jQuery上传文件，并在struts2中上传时显示进度条，我搜索了所有没有运气的人可以给我提供想法或一些代码片段的代码。谢谢。现在，我正在使用html这样的普通上传。

<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>