11月22文件上传的前端代码

<div class="layui-upload">
    <div class="layui-upload-drag" id="testList">
        <i class="layui-icon"></i>
        <p>点击上传，或将文件拖拽到此处</p>
    </div>
    <div class="layui-upload-list" style="max- 1000px;">
        <table class="layui-table">
            <colgroup>
                <col>
                <col width="150">
                <col width="260">
                <col width="150">
            </colgroup>
            <thead>
            <tr><th>文件名</th>
                <th>大小</th>
                <th>上传进度</th>
                <th>操作</th>
            </tr></thead>
            <tbody id="demoList"></tbody>
        </table>
    </div>
    <button type="button" class="layui-btn" id="testListAction">开始上传</button>
</div>
js:

<script src="assets/js/layui.js" charset="utf-8"></script>
<!-- 注意：如果你直接复制所有代码到本地，上述 JS 路径需要改成你本地的 -->
<script>
    layui.use(['upload', 'element', 'layer'], function(){
        var $ = layui.jquery
            ,upload = layui.upload
            ,element = layui.element
            ,layer = layui.layer;
        //演示多文件列表
        var uploadListIns = upload.render({
            elem: '#testList'
            ,elemList: $('#demoList') //列表元素对象
            ,url: '${pageContext.request.contextPath}/UploadServlet'
            ,data: {i1:1}//此处用的是第三方的 http 请求演示，实际使用时改成您自己的上传接口即可。
            ,accept: 'file'
            ,multiple: true
            ,number: 3
            ,auto: false
            ,bindAction: '#testListAction'
            //,data: {i1:+Integer.parseInt(request.getParameter("i"))}
            ,choose: function(obj){
                var that = this;
                var files = this.files = obj.pushFile(); //将每次选择的文件追加到文件队列
                //读取本地文件
                obj.preview(function(index, file, result){
                    var tr = $(['<tr id="upload-'+ index +'">'
                        ,'<td>'+ file.name +'</td>'
                        ,'<td>'+ (file.size/1014).toFixed(1) +'kb</td>'
                        ,'<td><div class="layui-progress" lay-filter="progress-demo-'+ index +'"><div class="layui-progress-bar" lay-percent=""></div></div></td>'
                        ,'<td>'
                        ,'<button class="layui-btn layui-btn-xs demo-reload layui-hide">重传</button>'
                        ,'<button class="layui-btn layui-btn-xs layui-btn-danger demo-delete">删除</button>'
                        ,'</td>'
                        ,'</tr>'].join(''));

                    //单个重传
                    tr.find('.demo-reload').on('click', function(){
                        obj.upload(index, file);
                    });

                    //删除
                    tr.find('.demo-delete').on('click', function(){
                        delete files[index]; //删除对应的文件
                        tr.remove();
                        uploadListIns.config.elem.next()[0].value = ''; //清空 input file 值，以免删除后出现同名文件不可选
                    });

                    that.elemList.append(tr);
                    element.render('progress'); //渲染新加的进度条组件
                });

            }
            ,done: function(res, index, upload){ //成功的回调
                var that = this;
                if(res.code == 0){ //上传成功
                    var tr = that.elemList.find('tr#upload-'+ index)
                        ,tds = tr.children();
                    tds.eq(3).html(''); //清空操作
                    delete this.files[index];
                    alert("成功");
                    window.location = "message.jsp"//删除文件队列已经上传成功的文件
                    return;
                }
                this.error(index, upload);
            }
            ,allDone: function(obj){ //多文件上传完毕后的状态回调
                   console.log(obj)
            }
            ,error: function(index, upload){ //错误回调
                var that = this;
                var tr = that.elemList.find('tr#upload-'+ index)
                    ,tds = tr.children();
                tds.eq(3).find('.demo-reload').removeClass('layui-hide');
                window.location="fail.jsp";

            }
            ,progress: function(n, elem, e, index){ //注意：index 参数为 layui 2.6.6 新增
                element.progress('progress-demo-'+ index, n + '%'); //执行进度条。n 即为返回的进度百分比
            }
        });
    });
</script>