最近做的项目要求实现预览word, pdf，png等文件功能，pdf以及png都很简单，轻松百度搞定，但是word预览研究了好久，所以特此记录分享。
前端实现预览word分为两种，一种是上传前预览（也就是前端使用input或者组件等选择文件后直接预览，此时还没有上传给后端，我定义为纯前端预览），一种是上传后预览（就是文档已经上传到后端，通过后端给的文件流实现预览）
一、先说第一种的实现方式:
首先下载安装docx-preview，引入
npm install xlsx docx-preview --saveimport { defaultOptions, renderAsync } from "docx-preview";
var docxx = require("docx-preview");我这里使用的是element ui 上传组件
<el-upload
class="upload-demo"
action=""
:http-request="myUpload"
:show-file-list="false"
>
<span class = "uploadEnclosure">上传附件</span>
</el-upload>选择文件以后
myUpload(content){
console.log(content);
const downUrl = URL.createObjectURL(content.file)
const a = document.createElement('a');
this.$refs.selectFileNameBox.innerHTML = "";
this.$refs.selectFileNameBox.append(a);
a.innerHTML = content.file.name;
a.href = downUrl
a.download = content.file.name;
a.target = '_blank';
const addTypeArray = content.file.name.split(".");
const addType = addTypeArray[addTypeArray.length - 1];
console.log(addType);
this.uploadFileName = content.file.name;
this.uploadFileObj = content.file;
if (addType === "pdf") {
const url = URL.createObjectURL(content.file);
console.log(url);
this.xzbjPreviewIframeSrc = url;
this.xzbjIframeIsShow = true;
this.xzbjDialogPreviewDiv = false;
this.xzbjPreviewImgUrl = "";
this.xzbjDocPreviewFlag = false;
this.previewBoxStyle = "height:400px;position: relative;overflow:hidden;"
}
else if(addType === "doc" || addType === "docx" || addType === "word"){
console.log("word文件预览")
this.xzbjPreviewImgUrl = "";
this.xzbjPreviewIframeSrc = "";
this.xzbjDialogPreviewDiv = false;
this.xzbjDocPreviewFlag = true;
this.xzbjIframeIsShow = false;
// 将file转为buffer
let fr = new FileReader();
fr.readAsArrayBuffer(content.file);
fr.addEventListener("loadend",(e) => {
console.log("loadend---->", e)
let buffer = e.target.result;
this.docxRender(buffer);
},false);
}
//".rar, .zip, .doc, .docx, .xls, .txt, .pdf, .jpg, .png, .jpeg,"
else if (["png", "jpg", "jpeg","bmp"].includes(addType)) {
this.xzbjPreviewIframeSrc = "";
this.xzbjIframeIsShow = false;
this.xzbjDocPreviewFlag = false;
this.imgPreview(content.file);
this.previewBoxStyle = "height:400px;position: relative;overflow:auto;"
} else if (addType === "rar" || addType === "zip" || addType === "7z") {
this.filePreviewInfo = "请下载附件进行查看"
this.xzbjPreviewImgUrl = "";
this.xzbjPreviewIframeSrc = "";
this.xzbjDocPreviewFlag = false;
this.xzbjDialogPreviewDiv = true;
this.$message({
message: "该文件类型暂不支持预览",
type: "warning",
});
return false;
}else{
this.filePreviewInfo = "该文件类型暂不支持预览"
this.xzbjPreviewIframeSrc = "";
this.xzbjIframeIsShow = false;
this.xzbjDialogPreviewDiv = true;
this.xzbjPreviewImgUrl = "";
this.xzbjDocPreviewFlag = false;
this.$message({
message: "请仅允许上传后缀为pdf、doc、docx、word、jpg、png、bmp、rar、zip、7z的附件",
type: "warning",
});
}
}// 渲染docx
docxRender(buffer) {
let bodyContainer = document.getElementById("demoDocContainer");
renderAsync(
buffer, // Blob | ArrayBuffer | Uint8Array, 可以是 JSZip.loadAsync 支持的任何类型
bodyContainer, // HTMLElement 渲染文档内容的元素,
null, // HTMLElement, 用于呈现文档样式、数字、字体的元素。如果为 null，则将使用 bodyContainer。
this.docxOptions // 配置
).then(res => {
console.log("res---->", res)
})
},下面是图片预览核心代码
imgPreview(file) {
// 看支持不支持FileReader
if (!file || !window.FileReader) return;
// console.log(/^image/.test(file.type), "---/^image/.test(file.type)")
if (/^image/.test(file.type)) {
// 创建一个reader
let reader = new FileReader();
// 将图片将转成 base64 格式
reader.readAsDataURL(file);
// 读取成功后的回调
reader.onload = ({ target }) => {
this.xzbjDialogPreviewDiv = false;
this.xzbjPreviewImgUrl = target.result; //将img转化为二进制数据
// console.log("target:", target);
};
}
},这样就实现了纯前端预览word功能
二、接下来实现 配合后端预览word
根据后端返回的流预览word
request({
method: "get",
url: "/notice/noticeFileView",
responseType: 'blob',
params:{
id:row.id
},
headers: {
"Content-Type": 'application/json'
},
}).then(res=>{
console.log(res,"---文件预览");
if(row.suffix.includes("pdf")){
this.previewPdfFn(res);
// let blob = new Blob([res],{
// type: 'application/pdf'
// })
// let url = window.URL.createObjectURL(blob);
this.xqPreviewImgUrl = "";
this.xqPreviewPdfUrl = this.previewPdfFn(res);
this.xqPdfPreviewFlag = true;
this.xqDocPreviewFlag = false;
this.xqPerviewStyle = "height:600px;position: relative;overflow:hidden"
}else if(row.suffix.includes("docx") || row.suffix.includes("doc")|| row.suffix.includes("word")){
console.log("预览word")
this.xqDocPreviewFlag = true;
let blob = new Blob([res],{
type: 'application/pdf'
})
this.$nextTick(()=>{
console.log(this.$refs.xqDocContainer,"---this.$refs.xqDocContainer")
docxx.renderAsync(blob, this.$refs.xqDocContainer)
})
} else if (row.suffix === ".rar" || row.suffix === ".zip" || row.suffix === "7z") {
this.xqDocPreviewFlag = false;
this.xzbjPreviewImgUrl = "";
this.xzbjPreviewIframeSrc = "";
this.$message({
message: "该文件类型暂不支持预览",
type: "warning",
});
return false;
}else if([".png", ".jpg", ".jpeg",".bmp"].includes(row.suffix)){
let blob = new Blob([res],{
type: 'application/pdf'
})
console.log(blob,"---blob")
let url = window.URL.createObjectURL(blob);
this.xqPreviewImgUrl = url;
this.xqPdfPreviewFlag = false;
this.xqDocPreviewFlag = false;
this.xqPreviewPdfUrl = "";
this.xqPerviewStyle = "height:600px;position: relative;overflow:auto"
}
this.xqDialogPreviewDiv = false;
}).catch(err=>{
console.log(err,"--文件预览失败")
})完毕
下面是参考链接：
https://www.jianshu.com/p/8e1e90570c52 预览word excel
https://blog.csdn.net/kaimo313/article/details/127012225 vue里使用docx-preview预览docx文件
https://volodymyrbaydalka.github.io/docxjs/
最后是一个好友赠送的组件
<template>
<div class="docx-preview-wrap">
<h4>
<input type="file" id="file" accept=".docx" @change="getFile"/>
</h4>
<div id="bodyContainer"></div>
</div>
</template>
<script>
import { defaultOptions, renderAsync } from "docx-preview";
console.log(defaultOptions);
export default {
name: 'DocxPreview',
data () {
return {
docxOptions: {
className: "kaimo-docx-666", // string：默认和文档样式类的类名/前缀
inWrapper: true, // boolean：启用围绕文档内容的包装器渲染
ignoreWidth: false, // boolean：禁用页面的渲染宽度
ignoreHeight: false, // boolean：禁止渲染页面高度
ignoreFonts: false, // boolean：禁用字体渲染
breakPages: true, // boolean：在分页符上启用分页
ignoreLastRenderedPageBreak: true, // boolean：在 lastRenderedPageBreak 元素上禁用分页
experimental: false, // boolean：启用实验功能（制表符停止计算）
trimXmlDeclaration: true, // boolean：如果为true，解析前会从 xml 文档中移除 xml 声明
useBase64URL: false, // boolean：如果为true，图片、字体等会转为base 64 URL，否则使用URL.createObjectURL
useMathMLPolyfill: false, // boolean：包括用于 chrome、edge 等的 MathML polyfill。
showChanges: false, // boolean：启用文档更改的实验性渲染（插入/删除）
debug: false, // boolean：启用额外的日志记录
}
};
},
methods: {
getFile(){
this.handlePreview()
},
handlePreview() {
let file = document.getElementById("file").files[0];
console.log(file);
// 将file转为buffer
let fr = new FileReader();
fr.readAsArrayBuffer(file);
fr.addEventListener("loadend",(e) => {
console.log("loadend---->", e)
let buffer = e.target.result;
this.docxRender(buffer);
},false);
},
// 渲染docx
docxRender(buffer) {
let bodyContainer = document.getElementById("bodyContainer");
renderAsync(
buffer, // Blob | ArrayBuffer | Uint8Array, 可以是 JSZip.loadAsync 支持的任何类型
bodyContainer, // HTMLElement 渲染文档内容的元素,
null, // HTMLElement, 用于呈现文档样式、数字、字体的元素。如果为 null，则将使用 bodyContainer。
this.docxOptions // 配置
).then(res => {
console.log("res---->", res)
})
}
},
};
</script>
结束啦，每天进步一点点，早日成为大神。啦啦啦
