HTML轉PDF字型的坑，搞了半天

閱讀文本大概需要3分鐘。

itext提供可HTML轉PDF的工具包，但是在中文字型時也許會遇到意想不到的問題。特别宋體對應的粗體。

0x01：引入itext包

<dependency>
       <groupId>com.itextpdf</groupId>
       <artifactId>itext7-core</artifactId>
       <version>7.1.11</version>
       <type>pom</type>
 </dependency>

<dependency>
       <groupId>com.itextpdf</groupId>
        <artifactId>html2pdf</artifactId>
        <version>2.0.2</version>
</dependency>

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0x02：要轉換的HTML檔案

<head>
</head>
<body>
      <p>iText</p>
      <div><b>大發發發薩法發發呆發呆東方大廈發</b></div>
      <div style="font-family:SimSun;weight:normal">Your developer here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的journey with iText begins here法大大是地方大發順豐薩法發順豐的</div>

      <div style="font-family:SimSun;font-weight:bold">Your developer here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的journey with iText begins here法大大是地方大發順豐薩法發順豐的</div>

      <p>iText</p>
      <div><b>大發發發薩法發發呆發呆東方大廈發</b></div>
      <div style="font-family:宋體;weight:normal">Your developer here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的journey with iText begins here法大大是地方大發順豐薩法發順豐的</div>

      <div style="font-family:宋體;font-weight:bold">Your developer here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的here法大大是地方大發順豐薩法發順豐的journey with iText begins here法大大是地方大發順豐薩法發順豐的</div>
 </body>

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0x03：編寫代碼

itext預設字型

public static void defaultFont() throws Exception{
        try {
            String pdfPath = "C:\\Users\\2230\\Desktop\\a\\defaultFont.pdf";
            PdfWriter pdfWriter = new PdfWriter(new File(pdfPath));
            PdfDocument pdfDocument = new PdfDocument(pdfWriter) ;
            Document doc = new Document(pdfDocument);
            pdfDocument.setDefaultPageSize(PageSize.A4);
            pdfDocument.addEventHandler(PdfDocumentEvent.END_PAGE, new TextFooterEventHandler(doc));
            ConverterProperties pro =  new ConverterProperties();
            FontProvider fontProvider = new DefaultFontProvider();
            fontProvider.addSystemFonts();
            pro.setFontProvider(fontProvider);
            HtmlConverter.convertToPdf(new FileInputStream("C:\\Users\\2230\\Desktop\\a\\d.html"), pdfDocument, pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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預設轉換結果

加載宋體

這裡隻加載了宋體，沒有加載宋粗體

public static void songTiDefaultFont() throws Exception{
        try{
            String pdfPath = "C:\\Users\\2230\\Desktop\\a\\songTiDefaultFont.pdf";
            PdfWriter pdfWriter = new PdfWriter(new File(pdfPath));
            PdfDocument pdfDocument = new PdfDocument(pdfWriter) ;
            Document doc = new Document(pdfDocument);
            pdfDocument.setDefaultPageSize(PageSize.A4);
            pdfDocument.addEventHandler(PdfDocumentEvent.END_PAGE, new TextFooterEventHandler(doc));
            ConverterProperties pro =  new ConverterProperties();
            FontProvider fontProvider = new DefaultFontProvider();
            //宋體
            FontProgram fontProgram1 = FontProgramFactory.createFont("C:\\Users\\2230\\Desktop\\a\\simsun.ttc,1");
            fontProvider.addFont(fontProgram1);
            pro.setFontProvider(fontProvider);
            HtmlConverter.convertToPdf(new FileInputStream("C:\\Users\\2230\\Desktop\\a\\d.html"), pdfDocument, pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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發現轉換出來的PDF，丢失了字型樣式

分析原因發現C:\Windows\Fonts預設沒有宋體粗字型，預設隻有宋體正常

網上下載下傳宋體粗字型宋體-粗體.ttf，下載下傳的都是ttf格式；代碼加載宋體粗字型

public static void songTiDefaultFont() throws Exception{
        try{
            String pdfPath = "C:\\Users\\2230\\Desktop\\a\\songTiDefaultFont.pdf";
            PdfWriter pdfWriter = new PdfWriter(new File(pdfPath));
            PdfDocument pdfDocument = new PdfDocument(pdfWriter) ;
            Document doc = new Document(pdfDocument);
            pdfDocument.setDefaultPageSize(PageSize.A4);
            pdfDocument.addEventHandler(PdfDocumentEvent.END_PAGE, new TextFooterEventHandler(doc));
            ConverterProperties pro =  new ConverterProperties();
            FontProvider fontProvider = new DefaultFontProvider();
            //宋體
            FontProgram fontProgram1 = FontProgramFactory.createFont("C:\\Users\\2230\\Desktop\\a\\simsun.ttc,1");
            fontProvider.addFont(fontProgram1);
            //宋體粗體
            FontProgram fontProgram2 = FontProgramFactory.createFont("C:\\Users\\2230\\Desktop\\a\\宋體-粗體.ttf");
            fontProvider.addFont(fontProgram2);
            pro.setFontProvider(fontProvider);
            HtmlConverter.convertToPdf(new FileInputStream("C:\\Users\\2230\\Desktop\\a\\d.html"), pdfDocument, pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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多加了如下代碼：

執行直接報錯，字型無法加載

把ttf轉換成otf格式字型

線上轉換工具：https://www.fontke.com/tool/convfont

public static void songConvertTiFont() throws Exception{
        try{
            String pdfPath = "C:\\Users\\2230\\Desktop\\a\\songTiFont.pdf";
            PdfWriter pdfWriter = new PdfWriter(new File(pdfPath));
            PdfDocument pdfDocument = new PdfDocument(pdfWriter) ;
            Document doc = new Document(pdfDocument);
            pdfDocument.setDefaultPageSize(PageSize.A4);
            pdfDocument.addEventHandler(PdfDocumentEvent.END_PAGE, new TextFooterEventHandler(doc));
            ConverterProperties pro =  new ConverterProperties();
            FontProvider fontProvider = new DefaultFontProvider();
            fontProvider.addSystemFonts();
            //宋體
            FontProgram fontProgram1 = FontProgramFactory.createFont("C:\\Users\\2230\\Desktop\\a\\simsun.ttc,0");
            fontProvider.addFont(fontProgram1);
            //宋體粗體
            FontProgram fontProgram2 = FontProgramFactory.createFont("C:\\Users\\2230\\Desktop\\a\\宋體-粗體.otf");
            fontProvider.addFont(fontProgram2);
            pro.setFontProvider(fontProvider);
            HtmlConverter.convertToPdf(new FileInputStream("C:\\Users\\2230\\Desktop\\a\\d.html"), pdfDocument, pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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轉換結果