问遍谷歌百度,依然没有好的方案.
打开Gayhub ,发现万赞JS(html2PDF,HTML2canvas) 效果也就那个XX样,一张糊里糊涂的img 冒充精美的PDF?
经过一天的苦思冥想,借助HiqPDF (估计Itext , spirePDF 等类似的都可以,思路还用这个就可以了),终于实现了目前来看最完美的方案 - -而且,贼简单你敢信?
先来个效果图 (=￣ω￣=)
GayHub首页转PDF去水印效果.png
看到了吗 ,页眉的黄色 水印精确删除 ,不用PS ,文字成段的在文件里 ,可以随意加工 ,图片的位置 , 边缘都很完美 ... 放大了看,还是那么清晰 - -我草 ,牛B!
简单版本,读文件 - -好处是无视网站定制,坏处当然就是非自动化啦(,,・ω・,,)
在你的后台放一个接收器,java,golang,python版本的 ,改天懒癌减轻了就补:
public ActionResult getWOW()
{
FileStream fs = new FileStream(Server.MapPath("/App_Data/wow.txt"), FileMode.OpenOrCreate, FileAccess.Read);//路径
StreamReader sr = new StreamReader(fs, Encoding.UTF8);
var htm = sr.ReadToEnd();
sr.Close();
fs.Close();
// create the HTML to PDF converter
HtmlToPdf htmlToPdfConverter = new HtmlToPdf();
// set browser width
htmlToPdfConverter.BrowserWidth = 1440;
// set browser height if specified, otherwise use the default
htmlToPdfConverter.BrowserHeight = htmlToPdfConverter.BrowserWidth * 2;
// set HTML Load timeout
//htmlToPdfConverter.HtmlLoadedTimeout = int.Parse(textBoxLoadHtmlTimeout.Text);
// set PDF page size and orientation
//htmlToPdfConverter.Document.PageSize = new PdfPageSize((float)(width / 2.4), (float)(height / 2.4));
htmlToPdfConverter.Document.PageSize = new PdfPageSize(htmlToPdfConverter.BrowserWidth, htmlToPdfConverter.BrowserHeight);
htmlToPdfConverter.Document.PageOrientation = PdfPageOrientation.Portrait;
// set the PDF standard used by the document
htmlToPdfConverter.Document.PdfStandard = PdfStandard.Pdf;//checkBoxPdfA.Checked ? PdfStandard.PdfA :
// set PDF page margins
htmlToPdfConverter.Document.Margins = new PdfMargins(0);
// set whether to embed the true type font in PDF
htmlToPdfConverter.Document.FontEmbedding = true;
// set triggering mode; for WaitTime mode set the wait time before convert
htmlToPdfConverter.TriggerMode = ConversionTriggerMode.Auto;
// set header and footer
//SetHeader(htmlToPdfConverter.Document);
//SetFooter(htmlToPdfConverter.Document);
// set the document security
//htmlToPdfConverter.Document.Security.OpenPassword = textBoxOpenPassword.Text;
htmlToPdfConverter.Document.Security.AllowPrinting = true;
// set the permissions password too if an open password was set
if (htmlToPdfConverter.Document.Security.OpenPassword != null && htmlToPdfConverter.Document.Security.OpenPassword != String.Empty)
htmlToPdfConverter.Document.Security.PermissionsPassword = htmlToPdfConverter.Document.Security.OpenPassword + "_admin";
//Cursor = Cursors.WaitCursor;
// convert HTML to PDF
string pdfFile = null;
// convert URL to a PDF memory buffer
//string url = formCollection["textBoxUrl"];
byte[] pdfBuffer = htmlToPdfConverter.ConvertHtmlToMemory(htm, null);
// send the PDF document to browser
FileResult fileResult = new FileContentResult(pdfBuffer, "application/pdf");
fileResult.FileDownloadName = "HtmlToPdf.pdf";
return File(pdfBuffer, "application/octet-stream", "test.pdf");//最后一个双引号里面是回传的文件名,加个time值就可以避免重复了
}
在浏览器按F12打开控制台(console)输入document.getElementsByTagName("html")[0].innerHTML
把得到的字符串拷贝到路径保存
然后把服务器跑起来,激活一下这个controller "http://localhost:3095/"
然后你就就会下载一个PDF,打开看看,激不激动?开不开心?
进阶版本- -前后端交互
- Controller:
public ActionResult GetPDFfromHtmlCode(int width, int height, string htm)
{
htm = Server.UrlDecode(htm);
//var path = Server.MapPath("/").Replace("\\", "/");
var path = @"C:\Users\Public\Documents\DevExpress Demos 18.1\Components\ASP.NET\CS\ASPxCardViewDemos";
htm = htm.Replace("/Content/",path+ "/Content/")
.Replace("src=\"", "src=\""+path)
//.Replace("<script src=\"", "<script src=\"" + path)
//.Replace("type=\"text/css\" href=\"", "type=\"text/css\" href=\"" + path)
.Replace("//","/")
;
// create the HTML to PDF converter
HtmlToPdf htmlToPdfConverter = new HtmlToPdf();
// set browser width
htmlToPdfConverter.BrowserWidth = 1440;
// set browser height if specified, otherwise use the default
htmlToPdfConverter.BrowserHeight = height;
// set HTML Load timeout
//htmlToPdfConverter.HtmlLoadedTimeout = int.Parse(textBoxLoadHtmlTimeout.Text);
// set PDF page size and orientation
//htmlToPdfConverter.Document.PageSize = new PdfPageSize((float)(width / 2.4), (float)(height / 2.4));
htmlToPdfConverter.Document.PageSize = new PdfPageSize(htmlToPdfConverter.BrowserWidth, height);
htmlToPdfConverter.Document.PageOrientation = PdfPageOrientation.Portrait;
// set the PDF standard used by the document
htmlToPdfConverter.Document.PdfStandard = PdfStandard.Pdf;//checkBoxPdfA.Checked ? PdfStandard.PdfA :
// set PDF page margins
htmlToPdfConverter.Document.Margins = new PdfMargins(0);
// set whether to embed the true type font in PDF
htmlToPdfConverter.Document.FontEmbedding = true;
// set triggering mode; for WaitTime mode set the wait time before convert
htmlToPdfConverter.TriggerMode = ConversionTriggerMode.Auto;
// set header and footer
//SetHeader(htmlToPdfConverter.Document);
//SetFooter(htmlToPdfConverter.Document);
// set the document security
//htmlToPdfConverter.Document.Security.OpenPassword = textBoxOpenPassword.Text;
htmlToPdfConverter.Document.Security.AllowPrinting = true;
// set the permissions password too if an open password was set
if (htmlToPdfConverter.Document.Security.OpenPassword != null && htmlToPdfConverter.Document.Security.OpenPassword != String.Empty)
htmlToPdfConverter.Document.Security.PermissionsPassword = htmlToPdfConverter.Document.Security.OpenPassword + "_admin";
//Cursor = Cursors.WaitCursor;
// convert HTML to PDF
string pdfFile = null;
// convert URL to a PDF memory buffer
//string url = formCollection["textBoxUrl"];
byte[] pdfBuffer = htmlToPdfConverter.ConvertHtmlToMemory(htm, null);
// send the PDF document to browser
FileResult fileResult = new FileContentResult(pdfBuffer, "application/pdf");
fileResult.FileDownloadName = "HtmlToPdf.pdf";
return File(pdfBuffer, "application/octet-stream","test.pdf");
}
- JS里面这个激活(注意转译html):
var DownLoadFile = function (options) {
var config = $.extend(true, { method: 'post' }, options);
var $iframe = $('<iframe id="down-file-iframe" />');
var $form = $('<form target="down-file-iframe" method="' + config.method + '" />');
$form.attr('action', config.url);
for (var key in config.data) {
$form.append('<input type="hidden" name="' + key + '" value="' + config.data[key] + '" />');
}
$iframe.append($form);
$(document.body).append($iframe);
$form[0].submit();
$iframe.remove();
}
DownLoadFile({
url: "http://localhost:3095/test/getPDFfromHtmlCode", //the URI of your controller
data: { "height": $("body").outerHeight(), "width": $("body").outerWidth(), "htm": escape(document.getElementsByTagName("html")[0].innerHTML), "head": "test" }//the data in your request ,according to your controller
});
最后说明
首先你要转的网页最好资源文件都是绝对路径的,因为巧妇难为无米之炊 ,你的服务器拿不到资源文件去渲染,当然就做不到给你一个完美的PDF
其次,如果是相对路径, 你需要在后端用replace大法,把相对路径转成服务器能获得的绝对路径
再其次,终极办法就是把网页里面的左右资源文件,你都给手动下载到服务器上,然后把相对地址都引用到这个位置, 除了太神奇的样式,基本都可以做到所见即所得
免费版本的hiqPDF会在文件的页眉位置打水印 ,这个时候就体现我们方法的好处了:导出的PDF不是图片而是真的PDF编码,所以可以用福昕 PDF 之类的软件打开把这个水印删除掉
(当然你也可以在后端直接替换编码,我这就不搞了,眼睛疼(๑´ڡ`๑))
开动一下脑筋,其实配合Markdown,在线Excel ,在线简历设计等等 东西,你可以很轻松的得到一份好看的PDF格式的 文档,图表,简历 ~~
所以不要纠结于我的代码是否好看,主要是思路 - -遇山劈山,逢海填海 :前端没法很好的渲染,那就放到后端; 后端拿不到相对路径 ,就转成绝对路径;手动麻烦 ,就封装成POST ,配合编解码函数`````
你看,html2canvas 2pdf 都有那么多的赞,效果其实就一张模糊的图片 ,而我们,用一个简单低级的思路, 得到了一份几乎完美的PDF文件 ,所以,思路啊老铁~~
声明:
- 无意支持盗版,大家有hiqPDF使用权的就用就好了,试用免费版本的也不触犯法律,效果还是可以的~~
- 对于非开发人员或者纯前端 ,这个方法还是稍微有点成本的 ,在此表示歉意
- 介于第二点 ,我准备在工作安稳一点后搭建一个在线的网站, 实现思路已经有了,希望到时候有志同道合的大佬们多给建议,多给帮助~~
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