file 文件上传，下载，删除

html:

 <div class="col-md-4 col-sm-4">
                        <div class="portlet light bordered">
                            <div class="portlet-title">
                                <div class="caption">合同附件</div>
                                <div class="addcaption">
                                    添加附件
                                    <input type="file" onchange="new_preview(this)">
                                </div>
                            </div>
                            <div class="portlet-body light">
                                <table class="table table-hover table-bordered" id="filesTable">
                                    <thead>
                                    <tr>
                                        <th>文件名</th>
                                        <th>操作</th>
                                    </tr>
                                    </thead>
                                    <tbody>
                                    </tbody>
                                </table>
                            </div>
                        </div>
                    </div>

js：

上传----

var files = [];
function new_preview(file){
    var fileObj = file.files[0];
    var formData = new FormData();
    formData.append('file', fileObj);
    formData.append('contractNo', file_contractNo);
    var options = {
        url: webroot + "/ht/uploadAndSaveFile",
        type: 'POST',
        data: formData,
        processData: false,
        contentType: false,
        success: function(rsp) {
            console.log(rsp);
            var innerHtml = '<tr><td>' + rsp.result.fileName + '</td>' +
                            '<td>'+
                            '<button class="btn green" data-uri="' + rsp.uri + '" onclick="downloadFiles(this)">'+
                            '<i class="fa fa-download"></i>'+
                            '</button>'+
                            // '<button class="btn red" data-uri="' + rsp.uri + '" onclick="new_removeFile(this)">'+
                            // '<i class="fa fa-trash"></i>'+
                            // '</button>'+
                            '</td>'+
                            '</tr>';
            $("#filesTable tbody").append(innerHtml);
            files.push(rsp);
        },
        error: function(e) {
            hint("网络错误!");
        }
    };
    $.ajax(options);
};

下载--------

function new_downloadFiles(id) {
    if (typeof(downloadFiles.iframe) == "undefined") {
        var iframe = document.createElement("iframe");
        downloadFiles.iframe = iframe;
        document.body.appendChild(downloadFiles.iframe);
    }
    downloadFiles.iframe.src = webroot  +  "/ht/download?id=" + id;
    downloadFiles.iframe.style.display = "none";
};

删除-------（未提供接口，只做html删除和数组删除）

function new_removeFile(e) {
    var _uri = $(e).attr("data-uri");
    for (var n = 0; n < files.length; n++) {
        if (files[n].uri == _uri) {
            files.splice(n, 1);
        }
    }
    $(e).parent().parent().remove();
}

(获取附件的列表)

    for (var m = 0; m < data.files.length; m++) {
        files_Html += '<tr><td>' + data.files[m].fileName + '</td>' +
                      '<td>'+
                      '<button class="btn green" onclick="new_downloadFiles(' + "'" + data.files[m].id + "'" + ')">'+
                      '<i class="fa fa-download"></i>'+
                      // '<button class="btn red" onclick="new_removeFile(' + "'" + data.files[m].id + "'" + ')">'+
                      // '<i class="fa fa-trash"></i>'+
                      '</td></tr>';
    }
    $("#filesTable tbody").append(files_Html);