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java - OpenHTMLToPDF：将自定义字体嵌入到由 HTML 创建的 PDF 中

问题描述

我使用 Jsoup 和OpenHTMLToPDF从 HTML 创建 PDF 。我必须在我的 PDF 中使用不同的字体来覆盖非拉丁字形（请参阅此处）。如何正确嵌入我的字体？

重现问题的简化程序：

src/main/resources/test.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <title>Font Test</title>
        <style>
            @font-face {
                font-family: 'source-sans';
                font-style: normal;
                font-weight: 400;
                src: url(fonts/SourceSansPro-Regular.ttf);
            }
        </style>
    </head>
    <body>    
        <p style="font-family: 'source-sans',serif">Latin Script</p>
        <p style="font-family: 'source-sans',serif">Είμαι ελληνικό κείμενο.</p>
    </body>
</html>

src/main/java/main.java：

import com.openhtmltopdf.extend.FSSupplier;
import com.openhtmltopdf.pdfboxout.PdfRendererBuilder;
import org.jsoup.Jsoup;
import org.jsoup.helper.W3CDom;
import org.w3c.dom.Document;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Objects;

public class main {
    public static void main(String[] args) {
        System.out.println("Starting");

        try {

            final W3CDom w3cDom = new W3CDom();
            final Document w3cDoc = w3cDom.fromJsoup(Jsoup.parse(readFile()));
            final OutputStream outStream = new FileOutputStream("test.pdf");

            final PdfRendererBuilder pdfBuilder = new PdfRendererBuilder();
            pdfBuilder.useFastMode();
            pdfBuilder.withW3cDocument(w3cDoc, "/");
            pdfBuilder.useFont(new File(main.class.getClassLoader().getResource("fonts/SourceSansPro-Regular.ttf").getFile()), "source-sans");
            pdfBuilder.toStream(outStream);

            pdfBuilder.run();
            outStream.close();

        } catch (Exception e) {
            System.out.println("PDF could not be created: " + e.getMessage());
        }

        System.out.println("Finish.");
    }


    private static String readFile() throws IOException {
        final ClassLoader classLoader = main.class.getClassLoader();
        final InputStream inputStream = classLoader.getResourceAsStream("test.html");
        final StringBuilder sb = new StringBuilder();
        final Reader r = new InputStreamReader(Objects.requireNonNull(inputStream), StandardCharsets.UTF_8);
        char[] buf = new char[1024];
        int amt = r.read(buf);
        while(amt > 0) {
            sb.append(buf, 0, amt);
            amt = r.read(buf);
        }
        return sb.toString();
    }
}

src/main/resources/fonts/SourceSansPro-regular.ttf

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>paf</groupId>
    <artifactId>test</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>7</source>
                    <target>7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>com.openhtmltopdf</groupId>
            <artifactId>openhtmltopdf-pdfbox</artifactId>
            <version>0.0.1-RC18</version>
        </dependency>
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.11.2</version>
        </dependency>
    </dependencies>
</project>

程序输出：

Starting
com.openhtmltopdf.load INFO:: TIME: parse stylesheets  148ms
com.openhtmltopdf.match INFO:: media = print
com.openhtmltopdf.match INFO:: Matcher created with 147 selectors
com.openhtmltopdf.load INFO:: Loading font(source-sans) from InputStream supplier now.
com.openhtmltopdf.exception WARNING:: bad URL given: /fonts/SourceSansPro-Regular.ttf
com.openhtmltopdf.exception WARNING:: Could not load @font-face font: /fonts/SourceSansPro-Regular.ttf
com.openhtmltopdf.exception WARNING:: Font metrics not available. Probably a bug.
com.openhtmltopdf.exception WARNING:: Font metrics not available. Probably a bug.
com.openhtmltopdf.render WARNING:: Font is null.
com.openhtmltopdf.render WARNING:: Font is null.
com.openhtmltopdf.render WARNING:: Font is null.
com.openhtmltopdf.render WARNING:: Font is null.
com.openhtmltopdf.render WARNING:: Font is null.
com.openhtmltopdf.render WARNING:: Font is null.
com.openhtmltopdf.render WARNING:: Font is null.
Finish.

生成的 PDF

Latin Script
##### ######## #######.

编辑 1：根据评论中链接的页面进行各种更改并更新到 RC18。现在有新的输出，但 PDF 中的字体仍然不正确。

编辑 2：尝试了快速渲染器

标签： javafontsjsouppdfboxopenhtmltopdf

解决方案

好的。感谢@Tilman Hausherr 的评论，我在 openhtmltopdf 的 GitHub-Issue Tracker 中询问并获得了一些帮助。

如果有人登陆这里有兴趣，这些更改使它起作用：

src/main/java/main.java （仅更改部分，参见上面的其余部分）：

    public static void main(String[] args) {
        System.out.println("Starting");

        try {

            final W3CDom w3cDom = new W3CDom();
            final Document w3cDoc = w3cDom.fromJsoup(Jsoup.parse(readFile()));
            final OutputStream outStream = new FileOutputStream("test.pdf");

            final PdfRendererBuilder pdfBuilder = new PdfRendererBuilder();
            pdfBuilder.useFastMode();
            pdfBuilder.withW3cDocument(w3cDoc, "/");
            pdfBuilder.useFont(new File(main.class.getClassLoader().getResource("fonts/SourceSansPro-Regular.ttf").getFile()), "source-sans");
            pdfBuilder.toStream(outStream);

            pdfBuilder.run();
            outStream.close();

        } catch (Exception e) {
            System.out.println("PDF could not be created: " + e.getMessage());
        }

        System.out.println("Finish.");
    }

src/main/resources/fonts/SourceSansPro-regular.ttf

来自 src/main/resources/test.html （仅更改部分，请参见上面的其余部分）

        @font-face {
            font-family: 'source-sans';
            font-style: normal;
            font-weight: 400;
            src: url(fonts/SourceSansPro-Regular.ttf);
            -fs-font-subset: complete-font;
        }

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