java中使用xQuery

一、使用eclipse新建一个java project

二、把saxon的jar包放入classpath（我用的jar包是saxon9ee.jar）

三、新建package，然后新建一个xml文件（cd_catalog.xml）,其内容如下：

<?xml version="1.0" encoding="ISO-8859-1"?>
<CATALOG>
<CD>
<TITLE>Empire Burlesque</TITLE>
<ARTIST>Bob Dylan</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>Columbia</COMPANY>
<PRICE>10.90</PRICE>
<YEAR>1985</YEAR>
</CD>
<CD>
<TITLE>Hide your heart</TITLE>
<ARTIST>Bonnie Tyler</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>CBS Records</COMPANY>
<PRICE>9.90</PRICE>
<YEAR>1988</YEAR>
</CD>
<CD>
<TITLE>Greatest Hits</TITLE>
<ARTIST>Dolly Parton</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>RCA</COMPANY>
<PRICE>9.90</PRICE>
<YEAR>1982</YEAR>
</CD>
<CD>
<TITLE>Still got the blues</TITLE>
<ARTIST>Gary Moore</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>Virgin records</COMPANY>
<PRICE>10.20</PRICE>
<YEAR>1990</YEAR>
</CD>
<CD>
<TITLE>Eros</TITLE>
<ARTIST>Eros Ramazzotti</ARTIST>
<COUNTRY>EU</COUNTRY>
<COMPANY>BMG</COMPANY>
<PRICE>9.90</PRICE>
<YEAR>1997</YEAR>
</CD>
<CD>
<TITLE>One night only</TITLE>
<ARTIST>Bee Gees</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>Polydor</COMPANY>
<PRICE>10.90</PRICE>
<YEAR>1998</YEAR>
</CD>
<CD>
<TITLE>Sylvias Mother</TITLE>
<ARTIST>Dr.Hook</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>CBS</COMPANY>
<PRICE>8.10</PRICE>
<YEAR>1973</YEAR>
</CD>
<CD>
<TITLE>Maggie May</TITLE>
<ARTIST>Rod Stewart</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>Pickwick</COMPANY>
<PRICE>8.50</PRICE>
<YEAR>1990</YEAR>
</CD>
<CD>
<TITLE>Romanza</TITLE>
<ARTIST>Andrea Bocelli</ARTIST>
<COUNTRY>EU</COUNTRY>
<COMPANY>Polydor</COMPANY>
<PRICE>10.80</PRICE>
<YEAR>1996</YEAR>
</CD>
<CD>
<TITLE>When a man loves a woman</TITLE>
<ARTIST>Percy Sledge</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>Atlantic</COMPANY>
<PRICE>8.70</PRICE>
<YEAR>1987</YEAR>
</CD>
</CATALOG>

        
四、新建一个java class（XqueryTest.java）

import java.io.IOException;
import java.util.Properties;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.xml.sax.SAXException;

import net.sf.saxon.Configuration;
import net.sf.saxon.dom.*;
import net.sf.saxon.query.DynamicQueryContext;
import net.sf.saxon.query.StaticQueryContext;
import net.sf.saxon.query.XQueryExpression;
import net.sf.saxon.trans.XPathException;

public class XqueryTest {
/**
* 执行查询
*/
public static void select(){
//文件
String fileString = "src/study/xquery/cd_catalog.xml";
//查询语句
String query = " for $s in //CD/TITLE "
+ " return $s";
//生产文档对象
Document document = getDocument(fileString);
Configuration configuration = new Configuration();
StaticQueryContext context = new StaticQueryContext(configuration, false);
//查询表达式对象
XQueryExpression expression = null;
try {
expression = context.compileQuery(query);
DynamicQueryContext context2 = new DynamicQueryContext(configuration);
context2.setContextItem(new DocumentWrapper(document,null,configuration));

final Properties props = new Properties();
props.setProperty(OutputKeys.METHOD, "xml");
props.setProperty(OutputKeys.INDENT, "yes");
//执行查询，并输出查询结果
expression.run(context2, new StreamResult(System.out), props);
} catch (XPathException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
/**
* 生产文档对象
*
* @param xml   文件名
* @return
*/
public static Document getDocument(String xml){
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder;
Document document = null;
try {
builder = builderFactory.newDocumentBuilder();
document = builder.parse(xml);
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
document.normalize();
return document;
}
/**
* 输入生成的文档内容
*
* @param doc
*/
public static void output(Document doc){
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = null;
try {
transformer = factory.newTransformer();
Properties properties = transformer.getOutputProperties();
properties.setProperty(OutputKeys.INDENT, "yes");
properties.setProperty(OutputKeys.ENCODING, "GB2312");
properties.setProperty(OutputKeys.METHOD, "xml");
properties.setProperty(OutputKeys.VERSION, "1.0");
transformer.setOutputProperties(properties);

DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(System.out);
transformer.transform(source, result);

} catch (TransformerConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TransformerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
select();
}
}

五、运行结果

<?xml version="1.0" encoding="UTF-8"?>

<TITLE>Empire Burlesque</TITLE>

<TITLE>Hide your heart</TITLE>

<TITLE>Greatest Hits</TITLE>

<TITLE>Still got the blues</TITLE>

<TITLE>Eros</TITLE>

<TITLE>One night only</TITLE>

<TITLE>Sylvias Mother</TITLE>

<TITLE>Maggie May</TITLE>

<TITLE>Romanza</TITLE>

<TITLE>When a man loves a woman</TITLE>