Java中的XML节点到字符串 [英] XML Node to String in Java

问题描述

我遇到了这个Java函数来将XML节点转换为Java String表示：

I came across this piece of Java function to convert an XML node to a Java String representation:

private String nodeToString(Node node) {
StringWriter sw = new StringWriter();
try {
 Transformer t = TransformerFactory.newInstance().newTransformer();
 t.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
 t.setOutputProperty(OutputKeys.INDENT, "yes");
 t.transform(new DOMSource(node), new StreamResult(sw));
} catch (TransformerException te) {
 System.out.println("nodeToString Transformer Exception");
}
return sw.toString();
}

它看起来很简单，因为它希望输出字符串没有任何XML声明，它必须包含缩进。

It looks straightforward in that it wants the output string doesn't have any XML declaration and it must contain indentation.

但我想知道实际输出应该如何，假设我有一个XML节点：

But I wonder how the actual output should be, suppose I have an XML node:

<p><media type="audio" id="au008093" rights="wbowned">
<title>Bee buzz</title>
</media>Most other kinds of bees live alone instead of in a colony. These bees make
        tunnels in wood or in the ground. The queen makes her own nest.</p>

我可以假设在应用上述转换后得到的字符串是：

Could I assume the resulting String after applying the above transformation is:

"media type="audio" id="au008093" rights="wbowned" title Bee buzz title /media"

我想自己测试一下，但我不知道如何以这个函数实际需要的方式表示这个XML节点。

I want to test it myself, but I have no idea on how to represent this XML node in the way this function actually wants.

我有点困惑，并提前感谢您的慷慨帮助。

I am bit confused, and thanks in advance for the generous help.

推荐答案

您在DOM树中有XML重新表示。

例如，您已经打开了一个XML文件，并且已经在DOM解析器中传递了它。

结果是内存中的DOM树创建XML。

现在只能通过遍历DOM树来访问XML信息。

如果需要，可以使用DOM的XML信息的String表示形式你使用转换的树。

这是因为无法直接从DO获取String表示M树。

所以如果例如节点你传入 nodeToString 是根XML文档的元素然后结果是包含原始XML数据的String。

标记仍然存在。即您将拥有有效的XML表示。只有这一次才会在String变量中。

You have an XML respesentation in a DOM tree.
For example you have opened an XML file and you have passed it in the DOM parser.
As a result a DOM tree in memory with your XML is created.
Now you can only access the XML info via traversal of the DOM tree.
If you need though, a String representation of the XML info of the DOM tree you use a transformation.
This happens since it is not possible to get the String representation directly from a DOM tree.
So if for example as Node node you pass in nodeToString is the root element of the XML doc then the result is a String containing the original XML data.
The tags will still be there. I.e. you will have a valid XML representation. Only this time will be in a String variable.

例如：

  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  DocumentBuilder parser = factory.newDocumentBuilder();
  Document xmlDoc = parser.parse(file);//file has the xml
  String xml = nodeToString(xmlDoc.getDocumentElement());//pass in the root
  //xml has the xml info. E.g no xml declaration. Add it
  xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?> + xml;//bad to append this way...
  System.out.println("XML is:"+xml);

免责声明：甚至没有尝试编译代码。希望你明白你必须做什么

DISCLAIMER: Did not even attempt to compile code. Hopefully you understand what you have to do

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