我一直在努力使用FOP和波兰字母生成PDF。我已经在SO上阅读了很多帖子，但到目前为止还没有成功！

这是我的模板：

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"    xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">
  <xsl:template match="root">
    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
      <fo:layout-master-set>
        <fo:simple-page-master master-name="simpleA4" page-height="29.7cm" page-width="21cm" margin-top="2cm" margin-bottom="2cm" margin-left="2cm" margin-right="2cm">
          <fo:region-body/>
        </fo:simple-page-master>
      </fo:layout-master-set>
      <fo:page-sequence master-reference="simpleA4">
        <fo:flow flow-name="xsl-region-body">
          <fo:block font-size="11pt" font-family='Arial'>
            <xsl:value-of select="TestString"/>
          </fo:block>
        </fo:flow>
      </fo:page-sequence>
    </fo:root>
  </xsl:template>
</xsl:stylesheet>

还有我的XML：

<?xml version="1.0" encoding="utf-8"?>
<root>
  <TestString>Chcemy mieć pewność, że nasze produkty będą miały długą żywotność i stosujemy opakowania, aby uchronić je przed uszkodzeniem podczas przenoszenia i transportu.</TestString>
</root>

我的Java代码称之为：

private void PolishTest() throws IOException, FOPException, TransformerException {
    // the XSL FO file
    File xsltFile = new File("C:\\Temp\\PolishTest.xsl");
    // the XML file which provides the input
    StreamSource xmlSource = new StreamSource(new File("C:\\Temp\\PolishTest.xml"));
    // create an instance of fop factory
    FopFactory fopFactory = FopFactory.newInstance(new File(".").toURI());
    // a user agent is needed for transformation
    FOUserAgent foUserAgent = fopFactory.newFOUserAgent();

    // Setup output
    OutputStream out = new FileOutputStream("C:\\Temp\\PolishTest.pdf");

    try {
        // Construct fop with desired output format
        Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);

        // Setup XSLT
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer(new StreamSource(xsltFile));

        // Resulting SAX events (the generated FO) must be piped through to FOP
        Result res = new SAXResult(fop.getDefaultHandler());

        // Start XSLT transformation and FOP processing
        // That's where the XML is first transformed to XSL-FO and then
        // PDF is created
        transformer.transform(xmlSource, res);
    } finally {
        out.close();
    }
}

正如在我的模板中看到的，我使用Arial作为字体系列，如果我在word中键入文本，使用Arial可以很好地工作。但是当从Java调用它时

我收到很多警告：

jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent
WARNING: Font "Arial,normal,400" not found. Substituting with "any,normal,400".
jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent
WARNING: Glyph "ć" (0x107, cacute) not available in font "Times-Roman".
jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent
WARNING: Glyph "ś" (0x15b, sacute) not available in font "Times-Roman".
jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent
WARNING: Glyph "ż" (0x17c, zdot) not available in font "Times-Roman".
jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent
WARNING: Glyph "ę" (0x119, eogonek) not available in font "Times-Roman".
jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent
WARNING: Glyph "ą" (0x105, aogonek) not available in font "Times-Roman".
jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent
WARNING: Glyph "ł" (0x142, lslash) not available in font "Times-Roman".
jul. 10, 2018 8:16:57 AM org.apache.fop.events.LoggingEventListener processEvent

所以我的问题是（因为）我做错了什么？

为什么FOP选择“Times Roman”，即使我指定了Arial？更重要的是如何修复它？

**更新**

使用am9417答案中的代码，我将Java代码更新为以下内容：

private static String config = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" +
        "<fop>\n" +
        "  <renderers>\n" +
        "    <renderer mime=\"application/pdf\">\n" +
        "      <fonts>\n" +
        "        <auto-detect/>\n" +
        "      </fonts>\n" +
        "    </renderer>\n" +
        "  </renderers>\n" +
        "</fop>";

private void PolishTest() throws IOException, SAXException, TransformerException {
    // the XSL FO file
    File xsltFile = new File("C:\\Temp\\PolishTest.xsl");
    // the XML file which provides the input
    StreamSource xmlSource = new StreamSource(new File("C:\\Temp\\PolishTest.xml"));
    // create an instance of fop factory

    URI uri =  new File(".").toURI();
    InputStream configSource = new ByteArrayInputStream(config.getBytes());

    FopFactory fopFactory = FopFactory.newInstance(uri, configSource);
    // a user agent is needed for transformation
    FOUserAgent foUserAgent = fopFactory.newFOUserAgent();


    // Setup output
    OutputStream out = new FileOutputStream("C:\\Temp\\PolishTest.pdf");

    try {
        // Construct fop with desired output format
        Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);

        // Setup XSLT
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer(new StreamSource(xsltFile));

        // Resulting SAX events (the generated FO) must be piped through to FOP
        Result res = new SAXResult(fop.getDefaultHandler());

        // Start XSLT transformation and FOP processing
        // That's where the XML is first transformed to XSL-FO and then
        // PDF is created
        transformer.transform(xmlSource, res);
    } finally {
        out.close();
    }
}