##文件预览组件
- 按照组件
解决展示pdf的问题 npm install pdfh5 npm install canvas@2.8.0 --ignore-scripts npm install --save dommatrix npm install --save web-streams-polyfill解决excel和docx预览的问题 npm install @vue-office/docx vue-demi@0.14.6 npm install @vue-office/excel vue-demi@0.14.6 npm install @vue/composition-api - 使用方法
- 前端：
页面引入组件： import VueOfficeDocx from '@vue-office/docx' import Pdfh5 from "pdfh5"; import VueOfficeExcel from '@vue-office/excel'import '@vue-office/excel/lib/index.css' import '@vue-office/docx/lib/index.css'pdf预览： <div id="pdf" v-if="nowItem.fileFormat === '.pdf'" style="width: 100%; height: 100%; border: none;"></div>docx预览： <vue-office-docx :key="new Date().getTime()" v-if="nowItem.fileFormat === '.docx'" :src="preViewUrl" @rendered="rendered" /> excel预览： <vue-office-excel :key="new Date().getTime()" v-if="nowItem.fileFormat === '.xls' || nowItem.fileFormat === '.xlsx'" :src="preViewUrl" @rendered="rendered" /> txt预览： <iframe v-if="nowItem.fileFormat === '.txt'" :src="preViewUrl" style="width: 100%; height: 98%; border: none;"/>js部分： downLoadLibrary(item.id).then(res => { //请求接口获取文件流if (item.fileFormat === '.txt') {this.preViewUrl = window.URL.createObjectURL(res) //将文件流转化为urlthis.loading = false;} else if (item.fileFormat === '.pdf') {let prePdfUrl = window.URL.createObjectURL(res) //将文件流转化为url //使用id #pdf 获取pdfh5实例this.pdfh5 = new Pdfh5('#pdf', {pdfurl: prePdfUrl,pageNum: false, //不显示页码backTop: false, //不显示回到顶部zoomEnable: false, //禁止缩放maxZoom: 1, //点击屏幕缩放1倍 也就是禁止缩放的});//完成let that = this;this.pdfh5.on('complete', function (status, msg, time) {that.rendered(); //渲染完成回调方法 可以自己定义业务逻辑});} else {this.preViewUrl = res //docx和excel}})请求接口:export function downLoadLibrary(id){return request({url: '/manager/library/downLoadLibrary/' + id,method: 'get',responseType: 'blob',})}- 后端：这里就是service层的接口，根据id获取文件流并返回给前端，前端根据文件格式进行不同的处理。
public void downLoadLibrary(Long id, HttpServletResponse response) {TInstructionResourceLibrary instructionResourceLibrary = this.selectInstructionResourceLibraryById(id);if (Objects.isNull(instructionResourceLibrary)) {throw new ServiceException("资源不存在");}String configByKey = sysConfigService.selectConfigByKey("sys.upload.file");String resourcePath = configByKey + instructionResourceLibrary.getResourcePath();File file = new File(resourcePath);if (!file.exists()) {throw new ServiceException("文件不存在:" + resourcePath);}try {if (instructionResourceLibrary.getFileFormat().equals(".txt")) {response.setContentType("text/plain");} else if (instructionResourceLibrary.getFileFormat().equals(".pdf")) {response.setContentType("application/pdf");} else {response.setContentType("application/octet-stream");}FileUtils.writeBytes(resourcePath, response.getOutputStream());} catch (Exception e) {throw new ServiceException("下载文件失败:" + e.getMessage());} }
视频预览组件
- 使用自带的video组件即可，无需额外的组件。
- 前端：
<videoref="video":controls="true"controlslist="nodownload noplaybackrate disablepictureinpicture":src="preViewUrl"webkit-playsinline="true"playsinline="true"x-webkit-airplay="allow"x5-playsinlinestyle="width: 100%"@play="onPlayerPlay"@pause="onPlayerPause"@seeking="seeking"@seeked="seeked"@canplay="onPlayerCanPlay"@timeupdate="onPlayerTimeUpdate":autoplay="false"/>
js部分：
playVideo(row) { // 打开视频弹出层 并且设置视频播放的src的url路径this.videoName = row.videoName;this.preViewOpen = true;this.preViewUrl = "http://域名：端口/路径"this.videoId = row.id;},handleClosePreView() { //关闭弹出层，并且清除播放记录 ，里面的字段可更具需要自定义console.log("关闭弹出层");this.addRecord("close")this.recordId = null; //播放记录idthis.videoId = null; //播放的视频idthis.currentTime = 0; //视频的当前播放进度时间this.tempTime = 0; //临时记录当前播放进度时间，防止拖动进度条时，时间不准确this.viewDuration = 0; //播放时长，单位秒，是根据开始播放到关闭弹出层的视频非暂停时间的总时长this.seconds = 0; //js计时器，大致计算播放时长 大概50多s 触发一次保存接口，之后清零this.setIntervalId && clearInterval(this.setIntervalId); // 清除定时器this.viewDurationInterval && clearInterval(this.viewDurationInterval); // 清除定时器this.duration = 0; //视频实际的时长this.videoName = ""; //视频每次this.$refs.video.load(); //重新加载视频this.preViewOpen = false; //关闭弹出层},//新增播放记录addRecord(option) { //要记录播放的时长let data = {"id": this.recordId, // 记录id"videoId": this.videoId, // 视频id"viewDuration": this.viewDuration, // 播放时长};addTrainVideoRecord(data).then(response => {console.log(response);this.recordId = response.msg;if (option === "close") {this.recordId = null;}});},onPlayerCanPlay() { //回调函数 视频准备好可以播放console.log("可以播放");},onPlayerPlay() { //回调函数 点击播放按钮，视频开始播放if (this.playerPauseFlag) {return;}//新增一条播放记录this.addRecord();this.setIntervalId = setInterval(() => {this.tempTime = this.currentTime + 0.01;this.seconds += 0.01;}, 1); // 定时器，每隔1ms获取一次播放时间this.viewDurationInterval = setInterval(() => {this.viewDuration += 1;}, 950)},onPlayerTimeUpdate(e) { //回调函数 视频播放进度变化 基本每秒触发一次this.currentTime = e.target.currentTime;this.duration = e.target.duration;//每播放1左右分钟秒保存一次播放记录if (this.seconds >= 140) {this.addRecord()this.seconds = 0;}},onPlayerPause() { //回调函数 视频暂停播放if (this.playerPauseFlag) {return;}//记录一次 下次开始是新的记录this.addRecord()this.setIntervalId && clearInterval(this.setIntervalId);this.viewDurationInterval && clearInterval(this.viewDurationInterval);},seeking() { //回调函数 拖动进度条console.log("拖动进度条");},seeked() { //回调函数 拖动进度条结束this.playerPauseFlag = truesetTimeout(function () {this.playerPauseFlag = false}, 1000)// 只允许向后拖动if (this.tempTime < this.currentTime) {this.$refs.video.currentTime = this.tempTime;}},
后端接口：流式返回的 每次2m的视频流
@GetMapping(value = "/viewVideo/{id}", produces = MediaType.TEXT_EVENT_STREAM_VALUE)public void viewVideo(@PathVariable("id") Long id, HttpServletResponse response) throws IOException {// 获取视频地址File videoFile = videoService.findVideoUrl(id);StreamingResponseBody stream = out -> {try (InputStream inputStream = Files.newInputStream(videoFile.toPath())) {byte[] bytes = new byte[1024 * 1024 * 2]; // 2Mint length;while ((length = inputStream.read(bytes)) != -1) {out.write(bytes, 0, length);}System.out.println("视频下载成功");out.flush();} catch (final Exception e) {throw new RuntimeException(e);}};stream.writeTo(response.getOutputStream());}