从单个DOM元素获取原始xml代码

I'm currently trying to get a part of an xml using DOM with Java language. For instance I would like to be able to have as a String the raw code of an XML Element (Tag) and it's children nodes.

我目前正在尝试使用DOM和Java语言来获得xml的一部分。例如，我希望能够将XML元素(标记)和它的子节点的原始代码作为字符串。

Example :

例子:

XML file :

XML文件:

<bookstore>
<book category="cooking">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="children">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="web">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="web" cover="paperback">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>

The goal is to have this for the 1st book element :

我们的目标是为第一本书的元素:

    <book category="cooking">
     <title lang="en">Everyday Italian</title>
     <author>Giada De Laurentiis</author>
     <year>2005</year>
     <price>30.00</price>
    </book>

I'm looking in the Element methods, I can't find some method useful for this in it.

我在元素方法中找不到有用的方法。

Thank you.

谢谢你！

2 个解决方案

#1

The W3C DOM does not have a convenient "toXML" like some of the alternative Java XML APIs provide, you need to use either the javax.xml.transform API or an org.w3c.dom.ls.LSSerializer. Assuming a variable doc containing the DOM Document, you can obtain an instance of LSSerializer like this:

W3C DOM不像一些可选的Java XML api提供的“toXML”，您需要使用Java . XML。转换API或org.w3c.dom.ls.LSSerializer。假设一个包含DOM文档的变量文档，您可以获得如下的LSSerializer实例:

// import org.w3c.dom.ls.*;

DOMImplementationLS ls = (DOMImplementationLS)doc.getImplementation();
LSSerializer ser = ls.createLSSerializer();

Once you have one of these, then you can serialize any Node from that document as an XML string using

一旦有了其中的一个节点，就可以使用XML字符串将该文档中的任何节点序列化

String xml = ser.writeToString(node);

#2

Look into xpath. While generally xpath is used in the context of HTML it stands for the XML Path Language, try the following.

xpath。虽然xpath通常在HTML上下文中使用，但它代表XML路径语言，请尝试以下操作。

//book[contains(@category,'cooking')]

/ / book[包含(@category,“烹饪”)]

#1

// import org.w3c.dom.ls.*;

DOMImplementationLS ls = (DOMImplementationLS)doc.getImplementation();
LSSerializer ser = ls.createLSSerializer();