/* $(document).ready(function () {
    var $input = $('input.file[type=file]'), count = $input.attr('type') ? $input.length : 0;
    if (count > 0) {
      $input.fileinput();
    }
  }); */
<link rel="stylesheet" href="css/bootstrapCSS/bootstrap.min.css">
<link rel="stylesheet" href="css/bootstrapCSS/bootstrap-theme.min.css">
<link rel="stylesheet" href="css/bootstrapCSS/fileinput.css" />
<div>
<input type="file" name="uploadfile" id="uploadfile" multiple class="file-loading" />
</div>
<script type="text/JavaScript" src="js/jQuery.min.js"></script>
<script type="text/javascript" src="js/bootstrap/fileinput.js"></script>
<script type="text/javascript" src="js/bootstrap/fileinput_locale_zh.js"></script>
<script type="text/javascript" src="js/bootstrap/bootstrap.min.js"></script>
<script type="text/javascript">
$("#uploadfile").fileinput({
        language: 'zh', //设置语言
        uploadUrl: "http://127.0.0.1/testDemo/fileupload/upload.do", //上传的地址
        allowedFileExtensions: ['jpg', 'gif', 'png'],//接收的文件后缀
        //uploadExtraData:{"id": 1, "fileName":'123.mp3'},
        uploadAsync: true, //默认异步上传
        showUpload: true, //是否显示上传按钮
        showRemove : true, //显示移除按钮
        showPreview : true, //是否显示预览
        showCaption: false,//是否显示标题
        browseClass: "btn btn-primary", //按钮样式   
        dropZoneEnabled: false,//是否显示拖拽区域
        //minImageWidth: 50, //图片的最小宽度
        //minImageHeight: 50,//图片的最小高度
        //maxImageWidth: 1000,//图片的最大宽度
        //maxImageHeight: 1000,//图片的最大高度
        //maxFileSize: 0,//单位为kb，如果为0表示不限制文件大小
        //minFileCount: 0,
        maxFileCount: 10, //表示允许同时上传的最大文件个数
        enctype: 'multipart/form-data',
        validateInitialCount:true,
        previewFileIcon: "<i class='glyphicon glyphicon-king'></i>",
        msgFilesTooMany: "选择上传的文件数量({n}) 超过允许的最大数值{m}！",
      });
//异步上传返回结果处理
$('#uploadfile').on('fileerror', function(event, data, msg) {
      console.log(data.id);
      console.log(data.index);
      console.log(data.file);
      console.log(data.reader);
      console.log(data.files);
      // get message
      alert(msg);
});
//异步上传返回结果处理
$("#uploadfile").on("fileuploaded", function (event, data, previewId, index) {
        console.log(data.id);
        console.log(data.index);
        console.log(data.file);
        console.log(data.reader);
        console.log(data.files);
        var obj = data.response;
        alert(JSON.stringify(data.success));
      });
//同步上传错误处理
    $('#uploadfile').on('filebatchuploaderror', function(event, data, msg) {
      console.log(data.id);
      console.log(data.index);
      console.log(data.file);
      console.log(data.reader);
      console.log(data.files);
      // get message
      alert(msg);
     });
  //同步上传返回结果处理
  $("#uploadfile").on("filebatchuploadsuccess", function (event, data, previewId, index) {
      console.log(data.id);
        console.log(data.index);
        console.log(data.file);
        console.log(data.reader);
        console.log(data.files);
        var obj = data.response;
        alert(JSON.stringify(data.success));
   });
//上传前
$('#uploadfile').on('filepreupload', function(event, data, previewId, index) {
    var form = data.form, files = data.files, extra = data.extra,
      response = data.response, reader = data.reader;
    console.log('File pre upload triggered');
  });
</script>