In the option (configuration) of the official document, it should be Boolean value whether to show file delete/clear button. The default is true You can just set this to false
javascript - How to remove the upload delete button above the Bootstrap fileinput thumbnail?-PHP Chinese Network Q&A

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
    <head>
        <meta charset="utf-8">
        <title>图片上传</title>
        <!-- jq -->
        <script type="text/javascript" src="<%=basePath%>static/plugs/jquery-3.1.1.min.js"></script>
        
        <!-- bootstrap -->
        <link rel="stylesheet" href="<%=basePath%>static/plugs/bootstrap/css/bootstrap.min.css">
        <script type="text/javascript" src="<%=basePath%>static/plugs/bootstrap/js/bootstrap.min.js"></script>
        
        <!-- 图片上传即使预览插件 -->
        <link rel="stylesheet" href="<%=basePath%>static/plugs/bootstrap-fileinput/css/fileinput.min.css">
        <script type="text/javascript" src="<%=basePath%>static/plugs/bootstrap-fileinput/js/fileinput.min.js"></script>
        <script type="text/javascript" src="<%=basePath%>static/plugs/bootstrap-fileinput/js/locales/zh.js"></script>
        
        <style>
            .container{padding-top:60px}
        </style>
    </head>
    <body>
        <p class="container">
            <p class="row">
                <p class="col-sm-6 col-sm-offset-3">
                    <form class="form-horizontal"  role="form" method="post"  action="<%=basePath%>uploadFile"  enctype="multipart/form-data" >
                        <p class="form-group">
                            <label class="col-sm-2 control-label">描述</label>
                            <p class="col-sm-10">
                                <input type="text" name="describ" class="col-sm-10 form-control"   placeholder="请描述">
                            </p>
                        </p>
                        <p class="form-group">
                            <label class="col-sm-2 control-label">文件</label>
                            <p class="col-sm-10">
                                <input type="file" name="myfile" data-ref="url" class="file-loading myfile" accept="text/plain" multiple/>
                                <input name="myfile" type="file" class="file myfile" multiple data-show-upload="false" data-show-caption="true">
                                
                            </p>
                        </p>
                        <p class="form-group">
                            <label class="col-sm-2 control-label">封面</label>
                            <p class="col-sm-10">
                                <input type="file" name="myfile" data-ref="url2" class="col-sm-10 myfile" multiple/>
                            </p>
                        </p>
                        <button type="submit" class="btn btn-default col-sm-2 col-sm-offset-4">提交</button>
                    </form>
                </p>
            </p>
        </p>
    
        <script>
        
            /* var imgObj = document.getElementById("myfile");
            alert(imgObj); */
            $(".myfile").fileinput({
                uploadUrl:"<%=basePath%>uploadFile",//上传的地址
                uploadAsync:false, //默认异步上传
                showUpload: false, //是否显示上传按钮,跟随文本框的那个
                showRemove : true, //显示移除按钮,跟随文本框的那个
                showCaption: true,//是否显示标题,就是那个文本框
                showPreview : true, //是否显示预览,不写默认为true
                dropZoneEnabled: false,//是否显示拖拽区域，默认不写为true，但是会占用很大区域
                //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: 4, //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}！",
                 allowedFileTypes: ['image','text'],//配置允许文件上传的类型
                 allowedPreviewTypes : [ 'image','text'],//配置所有的被预览文件类型
                 allowedPreviewMimeTypes : [ 'jpg', 'png', 'gif' ,'txt'],//控制被预览的所有mime类型
                 language : 'zh'
            })
            //异步上传返回结果处理
            $('.myfile').on('fileerror', function(event, data, msg) {
                console.log("fileerror");
                console.log(data);
            });
            //异步上传返回结果处理
            $(".myfile").on("fileuploaded", function (event, data, previewId, index) {
                console.log("fileuploaded");
                var ref=$(this).attr("data-ref");
                $("input[name='"+ref+"']").val(data.response.url);

            });

            //同步上传错误处理
            $('.myfile').on('filebatchuploaderror', function(event, data, msg) {
                console.log("filebatchuploaderror");
                console.log(data);
            });
            
            //同步上传返回结果处理
            $(".myfile").on("filebatchuploadsuccess", function (event, data, previewId, index) {
                console.log("filebatchuploadsuccess");
                console.log(data);
            });

            //上传前
            $('.myfile').on('filepreupload', function(event, data, previewId, index) {
                console.log("filepreupload");
            });        
        </script>
    </body>
</html>