java - 如何编写格式正确的xml

Question

我目前正在用 java 将 xml 写入 xml doc，但它的格式不正确，其格式如下:

<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies, 
an evil sorceress, and her own childhood to become queen 
of the world.</description>
</book>

而不是这样，我该怎么做才能将它与文档的其余部分正确对齐？

<book id="bk102">
      <author>Ralls, Kim</author>
      <title>Midnight Rain</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-12-16</publish_date>
      <description>A former architect battles corporate zombies, 
      an evil sorceress, and her own childhood to become queen 
      of the world.</description>
</book>

我收到了关于可能重复的回复，可能是这种情况，但在我的情况下，它在这里不起作用是我的代码:

private void writeFile(File file) {
            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            StreamResult resultStream = new StreamResult(new StringWriter());
            DOMSource source = new DOMSource(getDocument());
            transformer.transform(source, resultStream);

            BufferedWriter out = new BufferedWriter(new FileWriter(file));
            out.write(resultStream.getWriter().toString().trim());
            out.close();
}

Answer 1

你有没有尝试过 :

StreamSource stylesource = new StreamSource(getClass().getResourceAsStream("proper-indenting.xsl"));
Transformer transformer = TransformerFactory.newInstance().newTransformer(stylesource);

其中 xsl 源是:

<!DOCTYPE stylesheet [
  <!ENTITY cr "<xsl:text>
</xsl:text>">
]>


    <xsl:stylesheet
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
        xmlns:xalan="http://xml.apache.org/xslt" 
        version="1.0">

        <xsl:output method="xml" indent="yes" xalan:indent-amount="3"/> 

        <!-- copy out the xml -->
        <xsl:template match="* | @*">
            <xsl:copy><xsl:copy-of select="@*"/><xsl:apply-templates/></xsl:copy>
        </xsl:template>

    </xsl:stylesheet>

原出处 here