文件上传下载(四) 读 txt 文本 ajaxfileupload

前台，使用 ajaxfileupload.js 插件

插件：代码

jQuery.extend({
    // create frame
    createUploadIframe : function(id, uri) {
        var frameId = 'jUploadFrame' + id;

        if (window.ActiveXObject) {

            (function(jQuery){
                if(jQuery.browser) return;
                jQuery.browser = {};
                jQuery.browser.mozilla = false;
                jQuery.browser.webkit = false;
                jQuery.browser.opera = false;
                jQuery.browser.msie = false;
                var nAgt = navigator.userAgent;
                jQuery.browser.name = navigator.appName;
                jQuery.browser.fullVersion = ''+parseFloat(navigator.appVersion);
                jQuery.browser.majorVersion = parseInt(navigator.appVersion,10);
                var nameOffset,verOffset,ix;
// In Opera, the true version is after "Opera" or after "Version"
                if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
                    jQuery.browser.opera = true;
                    jQuery.browser.name = "Opera";
                    jQuery.browser.fullVersion = nAgt.substring(verOffset+6);
                    if ((verOffset=nAgt.indexOf("Version"))!=-1)
                        jQuery.browser.fullVersion = nAgt.substring(verOffset+8);
                }
// In MSIE, the true version is after "MSIE" in userAgent
                else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
                    jQuery.browser.msie = true;
                    jQuery.browser.name = "Microsoft Internet Explorer";
                    jQuery.browser.fullVersion = nAgt.substring(verOffset+5);
                }
// In Chrome, the true version is after "Chrome"
                else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {
                    jQuery.browser.webkit = true;
                    jQuery.browser.name = "Chrome";
                    jQuery.browser.fullVersion = nAgt.substring(verOffset+7);
                }
// In Safari, the true version is after "Safari" or after "Version"
                else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {
                    jQuery.browser.webkit = true;
                    jQuery.browser.name = "Safari";
                    jQuery.browser.fullVersion = nAgt.substring(verOffset+7);
                    if ((verOffset=nAgt.indexOf("Version"))!=-1)
                        jQuery.browser.fullVersion = nAgt.substring(verOffset+8);
                }
// In Firefox, the true version is after "Firefox"
                else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {
                    jQuery.browser.mozilla = true;
                    jQuery.browser.name = "Firefox";
                    jQuery.browser.fullVersion = nAgt.substring(verOffset+8);
                }
// In most other browsers, "name/version" is at the end of userAgent
                else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) <
                    (verOffset=nAgt.lastIndexOf('/')) )
                {
                    jQuery.browser.name = nAgt.substring(nameOffset,verOffset);
                    jQuery.browser.fullVersion = nAgt.substring(verOffset+1);
                    if (jQuery.browser.name.toLowerCase()==jQuery.browser.name.toUpperCase()) {
                        jQuery.browser.name = navigator.appName;
                    }
                }
// trim the fullVersion string at semicolon/space if present
                if ((ix=jQuery.browser.fullVersion.indexOf(";"))!=-1)
                    jQuery.browser.fullVersion=jQuery.browser.fullVersion.substring(0,ix);
                if ((ix=jQuery.browser.fullVersion.indexOf(" "))!=-1)
                    jQuery.browser.fullVersion=jQuery.browser.fullVersion.substring(0,ix);
                jQuery.browser.majorVersion = parseInt(''+jQuery.browser.fullVersion,10);
                if (isNaN(jQuery.browser.majorVersion)) {
                    jQuery.browser.fullVersion = ''+parseFloat(navigator.appVersion);
                    jQuery.browser.majorVersion = parseInt(navigator.appVersion,10);
                }
                jQuery.browser.version = jQuery.browser.majorVersion;
            })(jQuery);

            if(jQuery.browser.version == "9.0"){
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }else{
                var io = document.createElement('<iframe id="' + frameId
                    + '" name="' + frameId + '" />');
                if (typeof uri == 'boolean') {
                    io.src = 'javascript:false';
                } else if (typeof uri == 'string') {
                    io.src = uri;
                }
            }
        } else {
            var io = document.createElement('iframe');
            io.id = frameId;
            io.name = frameId;
        }
        io.style.position = 'absolute';
        io.style.top = '-1000px';
        io.style.left = '-1000px';

        document.body.appendChild(io);

        return io;
    },

    // create form
    createUploadForm : function(id, fileElementId, paramData) {
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        var form = jQuery('<form  action="" method="POST" name="'
            + formId + '" id="' + formId
            + '" enctype="multipart/form-data"></form>');

        //增加文本参数的支持 
        if(paramData){
            for(var paramName in paramData){
                $('<input type="hidden" name="' + paramName + '" value="' + paramData[paramName] + '" />').appendTo(form);
            }
        }

        var oldElement = jQuery('#' + fileElementId);
        var newElement = jQuery(oldElement).clone();
        jQuery(oldElement).attr('id', fileId);
        jQuery(oldElement).before(newElement);
        jQuery(oldElement).appendTo(form);
        // set attributes
        jQuery(form).css('position', 'absolute');
        jQuery(form).css('top', '-1200px');
        jQuery(form).css('left', '-1200px');
        jQuery(form).appendTo('body');
        return form;
    },

    ajaxFileUpload : function(s) {
        // TODO introduce global settings, allowing the client to modify
        // them for all requests, not only timeout
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = s.fileElementId;
        var form = jQuery.createUploadForm(id, s.fileElementId, s.data);
        var io = jQuery.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;

        if (s.global && !jQuery.active++) {
            // Watch for a new set of requests
            jQuery.event.trigger("ajaxStart");
        }
        var requestDone = false;
        // Create the request object
        var xml = {};
        if (s.global) {
            jQuery.event.trigger("ajaxSend", [ xml, s ]);
        }

        var uploadCallback = function(isTimeout) {
            // Wait for a response to come back
            var io = document.getElementById(frameId);
            try {
                if (io.contentWindow) {
                    xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML
                        : null;
                    xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
                        : io.contentWindow.document;

                } else if (io.contentDocument) {
                    xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML
                        : null;
                    xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument
                        : io.contentDocument.document;
                }
            } catch (e) {
                //alert("catch->"+e);
                //jQuery.handleError(s, xml, null, e);
                if(s.error){
                    s.error( s.context || s, xml, "error", e );
                }
            }
            if (xml || isTimeout == "timeout") {
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success"
                        : "error";
                    // Make sure that the request was successful or
                    // notmodified
                    if (status != "error") {
                        // process the data (runs the xml through
                        // httpData regardless of callback)
                        var data = jQuery.uploadHttpData(xml,
                            s.dataType);
                        if (s.success) {
                            // ifa local callback was specified, fire it
                            // and pass it the data
                            s.success(data, status);
                        }
                        if (s.global) {
                            // Fire the global callback
                            jQuery.event.trigger("ajaxSuccess", [ xml,
                                s ]);
                        }
                    } else {
                        //jQuery.handleError(s, xml, status);
                        if(s.error){
                            s.error( s.context || s, xml, status);
                        }
                    }
                } catch (e) {
                    //alert("error->"+e);
                    status = "error";
                    //jQuery.handleError(s, xml, status, e);
                    if(s.error){
                        s.error( s.context || s, xml, status, e);
                    }
                }
                if (s.global) {
                    // The request was completed
                    jQuery.event.trigger("ajaxComplete", [ xml, s ]);
                }

                // Handle the global AJAX counter
                if (s.global && !--jQuery.active) {
                    jQuery.event.trigger("ajaxStop");
                }
                // if (s.complete) {
                //     s.complete(xml, status);
                // }

                jQuery(io).unbind();

                setTimeout(function() {
                    try {
                        jQuery(io).remove();
                        jQuery(form).remove();

                    } catch (e) {
                        //jQuery.handleError(s, xml, null, e);
                        if(s.error){
                            s.error( s.context || s, xml, "error", status);
                        }
                    }

                }, 100);

                xml = null;
            }
        };
        // Timeout checker
        if (s.timeout > 0) {
            setTimeout(function() {
                if (!requestDone) {
                    // Check to see ifthe request is still happening
                    uploadCallback("timeout");
                }
            }, s.timeout);
        }
        try {
            var form = jQuery('#' + formId);
            jQuery(form).attr('action', s.url);
            jQuery(form).attr('method', 'POST');
            jQuery(form).attr('target', frameId);
            if (form.encoding) {
                form.encoding = 'multipart/form-data';
            } else {
                form.enctype = 'multipart/form-data';
            }

            jQuery(form).submit();
            //alert("submit");
        } catch (e) {
            //alert("submit error->"+e.message);
            //jQuery.handleError(s, xml, null, e);
            if(s.error){
                //s.error.call( s.context || s, xhr, status, e );
                s.error( s.context || s, xml, "error", e );
            }
        }

        /*
        if (window.attachEvent) {
            document.getElementById(frameId).attachEvent('onload',
                    uploadCallback);
        } else {
            document.getElementById(frameId).addEventListener('load',
                    uploadCallback, false);
        }
        */
        jQuery('#' + frameId).load(uploadCallback);

        return {
            abort : function() {
            }
        };
    },

    uploadHttpData : function(r, type) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // ifthe type is "script", eval it in global context
        if (type == "script") {
            jQuery.globalEval(data);
        }

        // Get the JavaScript object, ifJSON is used.
        if (type == "json") {
            if(data){
                var preBeginIndex = data.indexOf("<pre");
                if(preBeginIndex != -1){
                    var preEndIndex = data.indexOf(">", preBeginIndex);
                    var preText = data.substring(preBeginIndex, preEndIndex+1);
                    //alert(preBeginIndex + "==" + preEndIndex + "==" + preText);
                    data = data.replace(preText, "").replace("</pre>", "");
                }
            }

            var tagIndex = data.indexOf("{");
            if(tagIndex > 0){
                data = "{"+data+"}";
            }
            eval("data = " + data);
            //data = jQuery.parseJSON("data = " + data);
        }

        // evaluate scripts within html
        if (type == "html") {
            jQuery("<div>").html(data).evalScripts();
        }

        return data;
    }
});

 ## 注意：1.不要放在submit 中，不然会导致无法执行回调操作，可以用onclick 事件触发。2.先引 jquery.min.js 然后再引 ajaxfileupload.js 

html:

<div class="layui-form-item magt3">
       <label class="layui-form-label">请选择要导入文件</label>
       <div class="layui-input-block">
             <input type="file" id="filePath" name="filePath" style="margin-top: 5px;"/>
        </div>
 </div>

js:

$.ajaxFileUpload({
        url: xxxx+'/xx/xxx',
        secureuri: false,
        type: 'post',
        fileElementId: "filePath",// 这里写自己的
        dataType: "json",
        data: {hehe:$("#hehe").val()},
        success: function(data){
            if (data.success) {
               // 成功提示语
               // layui 的关窗 parent.layer.close(parent.layer.getFrameIndex(window.name));
            }else{
                // 失败提示语
            }
        }
    });

 后台接收：用 HttpServletRequest request 即可

serviceImpl:

    @Override
    public void importTxt(HttpServletRequest request,String hehe){
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        MultipartFile multipartFile = multipartRequest.getFile("filePath");
        if (multipartFile != null) {
            InputStream is = null;
            try {
                is = multipartFile.getInputStream();
            } catch (IOException e) {
                e.printStackTrace();
            }
            //获取表中数据
            List<String> dataList = 方法1(is);
            // 为空判断
            if (dataList == null || dataList.size() == 0) {
                throw new ServiceException(400,"导入失败：没有可以导入的数据！");
            }
            // 后续代码
        }
    }

方法1：

    /**获取txt的信息*/
    public List<String> importTxt(InputStream inputStream) {
        List<String> stringList = new ArrayList<>();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                stringList.add(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return stringList;
        }
    }

###  后续可能用到的 String [] arr = str.split("\\s+"); 用空格分隔字符