漂亮的打印XML文件

问题描述

我试图在没有任何外部库的情况下对XML文件进行漂亮打印，但无法让Java做我想要的...这是我的代码到目前为止（我添加了类似问题的任何解决方案！）：

I'm trying to prettyprint an XML-file without any external libraries, but cannot get Java to do what I want... Here is my code so far (I added any solutions from similar questions!):

TransformerFactory tfactory = TransformerFactory.newInstance();
tfactory.setAttribute("indent-number", 4);
Transformer transformer = tfactory.newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.MEDIA_TYPE, "text/xml");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
transformer.setOutputProperty("{http://xml.apache.org/xalan}indent-amount", "4");
transformer.setOutputProperty(OutputPropertiesFactory.S_KEY_INDENT_AMOUNT, "4");
File file = new File("C:\\text.xml");
DOMSource source = new DOMSource(DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(file));
transformer.transform(source, new StreamResult(file));

输入文件如下所示：

<?xml version="1.0" encoding="UTF-8" standalone="no"?><root><test><item0>a</item0><item1>b</item1></test></root>

我收到一个如下所示的输出：

I receive an output looking like this:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root>

<test>
<item0>a</item0>
<item1>b</item1>
    </test>
</root>

现在我没有得到的是为什么在$ code之后有一个空行>< root> 和< / test> 之间的缩进，但无其他地方。在这个新文件上运行代码不会改变！

Now the thing I don't get is why there is a blank line after <root> and an indentation before </test>, but nowhere else. Running the code on this new file changes nothing!

我希望我的输出文件如下所示：

I would like my output file to look like this:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root>
    <test>
        <item0>a</item0>
        <item1>b</item1>
     </test>
 </root>

---

更新

我已经从我的代码中删除了一些显然没有做任何事情的行：

---

Update

I have removed some lines from my code that apparently weren't doing anything anyway:

TransformerFactory tfactory = TransformerFactory.newInstance();
tfactory.setAttribute("indent-number", 4);
Transformer transformer = tfactory.newTransformer();
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
transformer.setOutputProperty("{http://xml.apache.org/xalan}indent-amount", "4");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
File file = new File("C:\\text.xml");
DOMSource source = new DOMSource(DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(file));
transformer.transform(source, new StreamResult(file));

现在，从原始问题的单行文件创建一个漂亮的打印文件，问题的一部分回答了！我不知道究竟是什么问题，但无论如何，现在工作^^

This now creates a pretty printed file from the one-line-file from the original question, so that part of the question is answered! I don't know what exactly the problem was, but whatever, works now^^

但是我也有一些从我的程序读取和写入的旧文件看起来像这样：

But I also have some old files that are read from and written to by my program that look kind of like this:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root>
<test>
<item0>a</item0>
<item1>b</item1>
</test>
</root>

它们在每个节点之后都有一个换行符，但没有缩进。我的代码保留文件不变...如何更正？

They have a line break after every node, but no indentation. My code leaves the file unchanged... How do I correct this?

推荐答案

你已经标记了这个XSLT，如果你申请以下XSLT样式表：

You have tagged this XSLT, and if you apply the following XSLT stylesheet:

XSLT 1.0

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xalan="http://xml.apache.org/xalan"
exclude-result-prefixes="xalan">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes" xalan:indent-amount="4"/>

<xsl:template match="@*|node()">
    <xsl:copy>
        <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
</xsl:template>

</xsl:stylesheet>

到您的XML输入，结果将是：

to your XML input, the result will be:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <test>
        <item0>a</item0>
        <item1>b</item1>
    </test>
</root>

现场演示：

请注意，项目漂亮打印为：

Note that the items are "pretty printed" as:

<item0>a</item0>

而不是显示在你的帖子中：

and not as shown in your post:

<item0>
    a
</item0>

这将表示XML的内容有效内容的更改。

which would represent a change in the content payload of the XML.

这篇关于漂亮的打印XML文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！