go实现在线阅读
https://www.freesion.com/article/1394808537/
- ubuntu下载libreoffice，并添加到环境变量
sudo apt-get update sudo apt-get upgrade sudo apt-get install libreoffice-common - 转doc、docx、xlsx、ppt、pptx为pdf/html时提示没有java环境（安装java环境）
apt install openjdk-8-jre-headless - 提示无法加载load源文件（需安装writer，calc， impress等）
sudo apt-get install libreoffice-writer sudo apt-get install libreoffice-calc sudo apt-get install libreoffice-impress - 中文无法识别需网/usr/share/fonts/ 添加字体包至少包含微软雅黑
- html文件直接返回
- pdf 文件
func main() { r := gin.Default() r.GET("/pdf", func(c *gin.Context) { dataByte, _ := ioutil.ReadFile("./view-pdf/pdf/pdf.html") dataStr := string(dataByte) pdfUrl := "/view/img?url=testpdf.pdf" dataStr = strings.Replace(dataStr, "{{url}}", pdfUrl, -1) dataByte = []byte(dataStr) c.Header("content-length", strconv.Itoa(len(dataByte))) c.Header("content-type:", "text/html;charset=UTF-8") c.Writer.Write([]byte(dataByte)) // c.Response.Writer.Write([]byte(dataByte)) }) r.GET("/view/img", func(c *gin.Context) { url := "./" + c.Query("url") DataByte, err := ioutil.ReadFile(url) if err != nil { c.Header("content-length", strconv.Itoa(len("404"))) c.Header("content-type:", "text/html;charset=UTF-8") c.Writer.Write([]byte("出现了一些问题,无法获取您的数据!")) return } c.Header("content-length", strconv.Itoa(len(DataByte))) c.Writer.Write(DataByte) }) r.Run(":8080") }
pdf.html
<html>
<head>
<title>GoViewFile</title>
<style>
.pdf {
height: 30rem;
border: 1rem solid rgba(0, 0, 0, .1);
}
</style>
</head>
<body>
<div id="pdf"></div>
</body>
<!-- <script src="/js/pdfobject.js"></script> -->
<script>
/*global ActiveXObject, window, console, define, module, jQuery */
//jshint unused:false, strict: false
/*
PDFObject v2.1.1
https://github.com/pipwerks/PDFObject
Copyright (c) 2008-2018 Philip Hutchison
MIT-style license: http://pipwerks.mit-license.org/
UMD module pattern from https://github.com/umdjs/umd/blob/master/templates/returnExports.js
*/
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define([], factory);
} else if (typeof module === 'object' && module.exports) {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
module.exports = factory();
} else {
// Browser globals (root is window)
root.PDFObject = factory();
}
}(this, function () {
"use strict";
//jshint unused:true
//PDFObject is designed for client-side (browsers), not server-side (node)
//Will choke on undefined navigator and window vars when run on server
//Return boolean false and exit function when running server-side
if(typeof window === "undefined" || typeof navigator === "undefined"){ return false; }
var pdfobjectversion = "2.1.1",
ua = window.navigator.userAgent,
//declare booleans
supportsPDFs,
isIE,
supportsPdfMimeType = (typeof navigator.mimeTypes['application/pdf'] !== "undefined"),
supportsPdfActiveX,
isModernBrowser = (function (){ return (typeof window.Promise !== "undefined"); })(),
isFirefox = (function (){ return (ua.indexOf("irefox") !== -1); } )(),
isFirefoxWithPDFJS = (function (){
//Firefox started shipping PDF.js in Firefox 19.
//If this is Firefox 19 or greater, assume PDF.js is available
if(!isFirefox){ return false; }
//parse userAgent string to get release version ("rv")
//ex: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:57.0) Gecko/20100101 Firefox/57.0
return (parseInt(ua.split("rv:")[1].split(".")[0], 10) > 18);
})(),
isIOS = (function (){ return (/iphone|ipad|ipod/i.test(ua.toLowerCase())); })(),
//declare functions
createAXO,
buildFragmentString,
log,
embedError,
embed,
getTargetElement,
generatePDFJSiframe,
generateEmbedElement;
/* ----------------------------------------------------
Supporting functions
---------------------------------------------------- */
createAXO = function (type){
var ax;
try {
ax = new ActiveXObject(type);
} catch (e) {
ax = null; //ensure ax remains null
}
return ax;
};
//IE11 still uses ActiveX for Adobe Reader, but IE 11 doesn't expose
//window.ActiveXObject the same way previous versions of IE did
//window.ActiveXObject will evaluate to false in IE 11, but "ActiveXObject" in window evaluates to true
//so check the first one for older IE, and the second for IE11
//FWIW, MS Edge (replacing IE11) does not support ActiveX at all, both will evaluate false
//Constructed as a method (not a prop) to avoid unneccesarry overhead -- will only be evaluated if needed
isIE = function (){ return !!(window.ActiveXObject || "ActiveXObject" in window); };
//If either ActiveX support for "AcroPDF.PDF" or "PDF.PdfCtrl" are found, return true
//Constructed as a method (not a prop) to avoid unneccesarry overhead -- will only be evaluated if needed
supportsPdfActiveX = function (){ return !!(createAXO("AcroPDF.PDF") || createAXO("PDF.PdfCtrl")); };
//Determines whether PDF support is available
supportsPDFs = (
//as of iOS 12, inline PDF rendering is still not supported in Safari or native webview
//3rd-party browsers (eg Chrome, Firefox) use Apple's webview for rendering, and thus the same result as Safari
//Therefore if iOS, we shall assume that PDF support is not available
!isIOS && (
//Modern versions of Firefox come bundled with PDFJS
isFirefoxWithPDFJS ||
//Browsers that still support the original MIME type check
supportsPdfMimeType || (
//Pity the poor souls still using IE
isIE() && supportsPdfActiveX()
)
)
);
//Create a fragment identifier for using PDF Open parameters when embedding PDF
buildFragmentString = function(pdfParams){
var string = "",
prop;
if(pdfParams){
for (prop in pdfParams) {
if (pdfParams.hasOwnProperty(prop)) {
string += encodeURIComponent(prop) + "=" + encodeURIComponent(pdfParams[prop]) + "&";
}
}
//The string will be empty if no PDF Params found
if(string){
string = "#" + string;
//Remove last ampersand
string = string.slice(0, string.length - 1);
}
}
return string;
};
log = function (msg){
if(typeof console !== "undefined" && console.log){
console.log("[PDFObject] " + msg);
}
};
embedError = function (msg){
log(msg);
return false;
};
getTargetElement = function (targetSelector){
//Default to body for full-browser PDF
var targetNode = document.body;
//If a targetSelector is specified, check to see whether
//it's passing a selector, jQuery object, or an HTML element
if(typeof targetSelector === "string"){
//Is CSS selector
targetNode = document.querySelector(targetSelector);
} else if (typeof jQuery !== "undefined" && targetSelector instanceof jQuery && targetSelector.length) {
//Is jQuery element. Extract HTML node
targetNode = targetSelector.get(0);
} else if (typeof targetSelector.nodeType !== "undefined" && targetSelector.nodeType === 1){
//Is HTML element
targetNode = targetSelector;
}
return targetNode;
};
generatePDFJSiframe = function (targetNode, url, pdfOpenFragment, PDFJS_URL, id){
var fullURL = PDFJS_URL + "?file=" + encodeURIComponent(url) + pdfOpenFragment;
var scrollfix = (isIOS) ? "-webkit-overflow-scrolling: touch; overflow-y: scroll; " : "overflow: hidden; ";
var iframe = "<div style='" + scrollfix + "position: absolute; top: 0; right: 0; bottom: 0; left: 0;'><iframe " + id + " src='" + fullURL + "' style='border: none; width: 100%; height: 100%;' frameborder='0'></iframe></div>";
targetNode.className += " pdfobject-container";
targetNode.style.position = "relative";
targetNode.style.overflow = "auto";
targetNode.innerHTML = iframe;
return targetNode.getElementsByTagName("iframe")[0];
};
generateEmbedElement = function (targetNode, targetSelector, url, pdfOpenFragment, width, height, id){
var style = "";
if(targetSelector && targetSelector !== document.body){
style = "width: " + width + "; height: " + height + ";";
} else {
style = "position: absolute; top: 0; right: 0; bottom: 0; left: 0; width: 100%; height: 100%;";
}
targetNode.className += " pdfobject-container";
targetNode.innerHTML = "<embed " + id + " class='pdfobject' src='" + url + pdfOpenFragment + "' type='application/pdf' style='overflow: auto; " + style + "'/>";
return targetNode.getElementsByTagName("embed")[0];
};
embed = function(url, targetSelector, options){
//Ensure URL is available. If not, exit now.
if(typeof url !== "string"){ return embedError("URL is not valid"); }
//If targetSelector is not defined, convert to boolean
targetSelector = (typeof targetSelector !== "undefined") ? targetSelector : false;
//Ensure options object is not undefined -- enables easier error checking below
options = (typeof options !== "undefined") ? options : {};
//Get passed options, or set reasonable defaults
var id = (options.id && typeof options.id === "string") ? "id='" + options.id + "'" : "",
page = (options.page) ? options.page : false,
pdfOpenParams = (options.pdfOpenParams) ? options.pdfOpenParams : {},
fallbackLink = (typeof options.fallbackLink !== "undefined") ? options.fallbackLink : true,
width = (options.width) ? options.width : "100%",
height = (options.height) ? options.height : "100%",
assumptionMode = (typeof options.assumptionMode === "boolean") ? options.assumptionMode : true,
forcePDFJS = (typeof options.forcePDFJS === "boolean") ? options.forcePDFJS : false,
PDFJS_URL = (options.PDFJS_URL) ? options.PDFJS_URL : false,
targetNode = getTargetElement(targetSelector),
fallbackHTML = "",
pdfOpenFragment = "",
fallbackHTML_default = "<p>This browser does not support inline PDFs. Please download the PDF to view it: <a href='[url]'>Download PDF</a></p>";
//If target element is specified but is not valid, exit without doing anything
if(!targetNode){ return embedError("Target element cannot be determined"); }
//page option overrides pdfOpenParams, if found
if(page){
pdfOpenParams.page = page;
}
//Stringify optional Adobe params for opening document (as fragment identifier)
pdfOpenFragment = buildFragmentString(pdfOpenParams);
//Do the dance
//If the forcePDFJS option is invoked, skip everything else and embed as directed
if(forcePDFJS && PDFJS_URL){
return generatePDFJSiframe(targetNode, url, pdfOpenFragment, PDFJS_URL, id);
//If traditional support is provided, or if this is a modern browser and not iOS (see comment for supportsPDFs declaration)
} else if(supportsPDFs || (assumptionMode && isModernBrowser && !isIOS)){
return generateEmbedElement(targetNode, targetSelector, url, pdfOpenFragment, width, height, id);
//If everything else has failed and a PDFJS fallback is provided, try to use it
} else if(PDFJS_URL){
return generatePDFJSiframe(targetNode, url, pdfOpenFragment, PDFJS_URL, id);
} else {
//Display the fallback link if available
if(fallbackLink){
fallbackHTML = (typeof fallbackLink === "string") ? fallbackLink : fallbackHTML_default;
targetNode.innerHTML = fallbackHTML.replace(/\[url\]/g, url);
}
return embedError("This browser does not support embedded PDFs");
}
};
return {
embed: function (a,b,c){ return embed(a,b,c); },
pdfobjectversion: (function () { return pdfobjectversion; })(),
supportsPDFs: (function (){ return supportsPDFs; })()
};
}));
</script>
<script>PDFObject.embed("{{url}}", "#pdf");</script>
</html>
