Android的XML解析器或图书馆简单的XML节点串 [英] Android XML Parser or Library for Simple XML Node Strings
问题描述
XML文件的这一个示例:
This an example of XML file:
<?xml version="1.0"?>
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<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.</description>
</book>
<book id="bk103">
<author>Corets, Eva</author>
<title>Maeve Ascendant</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-11-17</publish_date>
<description>After the collapse of a nanotechnology
society in England.</description>
</book>
</catalog>
思我想,许多标准书籍笔者在此文件中进行搜索,例如,按流派,价格等...
Si I want to search in this file by many criteria books, for example by author, by genre, price, etc...
我会使用XPath查询来做到这一点,那么,有一些简单的方法来使用??? 例如,我要检查,如果一个作家存在,而要做到这一点,我必须有一个在我将传递一个XPath查询把我的功法?
I will use XPath queries to do this, So is there some simple method to use??? For example, I want to check if an author exist and to do this I must have a method in which I'll pass an XPath query to turn me the result...
在此先感谢,
最好的问候,
阿里
推荐答案
您可以将DOM API使用的 javax.xml.xpath.XPathFactory 和的 javax.xml.xpath.XPath中作为descibed在 http://developer.android.com/reference/javax/xml/xpath/package-summary.html 。
You can combine DOM API with javax.xml.xpath.XPathFactory and javax.xml.xpath.XPath as descibed at http://developer.android.com/reference/javax/xml/xpath/package-summary.html.
例如:
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();;
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document document = builder.parse("input.xml");
// NodeList books = document.getElementsByTagName("book");
XPath xpath = XPathFactory.newInstance().newXPath();
String expression = "/catalog/book[1]/author"; // first book
Node author = (Node) xpath.evaluate(expression, document, XPathConstants.NODE);
if (author == null)
System.out.println("Element author not exists");
else
System.out.println(author.getTextContent());
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