PDF file itextpdf Insert HTML content and Chinese solution

Brief Introduction

Currently there are many kinds of HTML files on the Web directly to the technical posts in PDF, but very few directly to the part of HTML as a paragraph into the PDF, and there is no good solution to the Chinese display problem.

So this morning, a study was conducted around this issue, and the solution was shared with everyone.

Itextpdf Basic Operations please visit: http://www.cnblogs.com/mvilplss/p/5640598.html

Thank you: http://gridmix.blog.51cto.com/4764051/1229585

Implementation ideas

If you want to insert an HTML fragment, we use a static method of a class:

 1  String html = "<div style= ' color:green;font-size:20px; ' > Hello World! Hello World!</div> " 2  Paragraph context = new   Paragraph ();  3  elementlist elementlist =xmlworkerhelper.parsetoelementlist (htmlstring, 
    
     null 
     );  4   ( Element element:elementlist) { 5   co Ntext.add (element);  6   7
      Document.add (context); 

But you will find that you can't display Chinese, there are many ways to solve the problem online, but it doesn't work.

View Xmlworkerhelper.parsetoelementlist (htmlstring, NULL) The source of this method, found

Cssappliers cssappliers = new Cssappliersimpl (Fontfactory.getfontimp ()), font replacement is possible. 

1  Public StaticElementlist parsetoelementlist (string html, string css)throwsIOException {2         //CSS3Cssresolver Cssresolver =Newstyleattrcssresolver ();4         if(CSS! =NULL) {5Cssfile cssfile = Xmlworkerhelper.getcss (NewBytearrayinputstream (Css.getbytes ()));6 cssresolver.addcss (cssfile);7         }8         9         //HTMLTenCssappliers cssappliers =NewCssappliersimpl (Fontfactory.getfontimp ());// The font can be manipulated here  OneHtmlpipelinecontext Htmlcontext =NewHtmlpipelinecontext (cssappliers); A htmlcontext.settagfactory (Tags.gethtmltagprocessorfactory ()); -Htmlcontext.autobookmark (false); -          the         //Pipelines -Elementlist elements =Newelementlist (); -Elementhandlerpipeline end =NewElementhandlerpipeline (Elements,NULL); -Htmlpipeline Htmlpipeline =NewHtmlpipeline (Htmlcontext, end); +Cssresolverpipeline Csspipeline =Newcssresolverpipeline (Cssresolver, htmlpipeline); -          +         //XML Worker AXmlworker worker =NewXmlworker (Csspipeline,true); atXmlparser p =NewXmlparser (worker); -P.parse (NewBytearrayinputstream (Html.getbytes ())); -          -         returnelements; -}

So we think of overriding the GetFont (*) Method of the Xmlworkerfontprovider class, and for fonts that do not have a CSS style declared, the default font is set by default using the Undefine font style.

1  Public classMyxmlworkerhelper {2      Public Static classMyfontsproviderextendsXmlworkerfontprovider {3          PublicMyfontsprovider () {4             Super(NULL,NULL);5         }6 7 @Override8          PublicFont GetFont (FinalString fontname, String encoding,floatSizeFinal intstyle) {9 TenString Fntname =FontName; One             if(Fntname = =NULL) { AFntname = "Song Body"; -             } -             return Super. GetFont (fntname, encoding, size, style); the         } -     } -  -      Public StaticElementlist parsetoelementlist (string html, string css)throwsIOException { +         //CSS -Cssresolver Cssresolver =Newstyleattrcssresolver (); +         if(CSS! =NULL) { ACssfile cssfile = Xmlworkerhelper.getcss (NewBytearrayinputstream (Css.getbytes ())); at cssresolver.addcss (cssfile); -         } -  -         //HTML -Myfontsprovider Fontprovider =NewMyfontsprovider (); -Cssappliers cssappliers =NewCssappliersimpl (fontprovider); inHtmlpipelinecontext Htmlcontext =NewHtmlpipelinecontext (cssappliers); - htmlcontext.settagfactory (Tags.gethtmltagprocessorfactory ()); toHtmlcontext.autobookmark (false); +  -         //Pipelines theElementlist elements =Newelementlist (); *Elementhandlerpipeline end =NewElementhandlerpipeline (Elements,NULL); $Htmlpipeline Htmlpipeline =NewHtmlpipeline (Htmlcontext, end);Panax NotoginsengCssresolverpipeline Csspipeline =Newcssresolverpipeline (Cssresolver, htmlpipeline); -  the         //XML Worker +Xmlworker worker =NewXmlworker (Csspipeline,true); AXmlparser p =NewXmlparser (worker); the        html = html.replace ("<br>", ""). Replace (") . Replace (" <link> "," ");  -P.parse (NewBytearrayinputstream (Html.getbytes ())); $  $         returnelements; -     } -  the}

Because Xmlwork does not support single-label HTML, the label is filtered. Otherwise you will get an error:Invalid nested tag div found, expected closing tag BR

PDF file itextpdf Insert HTML content and Chinese solution