XPath是用來表達XML文檔樹各種元素的位置的描述。通過XPath直接獲取文檔元素比較准確，直接，效率也高。
XPath的路徑分相對的和絕對的，絕對路徑以“/"開始，相對路徑以“./”或直接以元素的名開頭。
XML
<?XML version = "1.0" encoding = "UTF-8"?>
<persons>
<country>china</country>
<city>zhengzhou</city>
<person>
<id>101</id>
<name>zhangsan</name>
<contacts>
<email>zhangsan@yahoo.cn</email>
<tel>0371-85555555</tel>
<qq>6683965</QQ>
</contacts>
<addresses>
<address>
<zipcode>450000</zipcode>
<street>aaa</street>
</address>
<address>
<zipcode>450001</zipcode>
<street>bbb</street>
</address>
</addresses>
</person>
<person>
<id>102</id>
<name>lisi</name>
<contacts>
<email>lisi@yahoo.cn</email>
<tel>0371-68554545</tel>
<qq>224488</QQ>
</contacts>
<addresses>
<address>
<zipcode>450002</zipcode>
<street>xxx</street>
</address>
<address>
<zipcode>450003</zipcode>
<street>yyy</street>
</address>
</addresses>
</person>
</persons>
import java.io.File;
import Java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
/**
* XML相對路徑測試
*
* @author leizhimin 2010-1-6 11:10:54
*/
public class TestDom {
public static void main(String[] args) {
File xmlf = new File("D:\\person.XML");
Document doc = XmlToolkit.makeDocument(XMLf, "UTF-8");
Element e_plan = (Element) doc.selectSingleNode("/persons");
Element e_id = (Element) e_plan.selectSingleNode("./country");
Element e_id1 = (Element) e_plan.selectSingleNode("country");
List<Element> eplist = e_plan.selectNodes("/persons/person");
for (Element ep : eplist) {
String path = ep.getPath();
Element id = (Element) ep.selectSingleNode("id");
System.out.println(id.getText());
}
System.out.println("---------------");
}
}
101
102
---------------
Process finished with exit code 0