这是首次上传

这是点击“X”按钮移除后，重新上传出现的情况

这是代码:

var sessionId = '${sessionId}';
$(function(){
    $("#upload").uploadify({
        buttonText : '上传',
        auto         : true,
        method:'post',//发送请求的方式，get或post
        multi:false,//是否允许选择多个文件
        fileObjName:'upfile',
        uploadLimit:1,
        removeCompleted: true,
        removeTimeout:999,
        showUploadedPercent:true,//是否实时显示上传的百分比，如20%
        showUploadedSize:true,
        swf           : '${pageContext.request.contextPath}/xxx/fileload/uploadify.swf',
        uploader      : '../../fileUpload.do;jsessionid='+sessionId,
        onUploadSuccess : function(file, data, response) {
            //alert('The file ' + file.name + ' was successfully uploaded with a response of ' + response + ':' + data);
        },
        onUploadError : function(file, errorCode, errorMsg, errorString) {
            alert('The file ' + file.name + ' could not be uploaded: ' + errorString);
        }
        

    });
    
});