请教一个JDOM中获取结点的问题
有XML文档booktore.xml内容如下：
<bookstore>
<book>
<title lang= "eng "> Harry Potter </title>
<price> 29.99 </price>
<author> Jenny </author>
</book>
</bookstore>

SAXBuilder builder = new SAXBuilder();
Document read_doc = builder.build( "bookstore.xml ");
Element root = read_doc.getRootElement();
Element target = root.getChild( "price ");

System.out.println(target);

为什么输出的是null？还有什么办法能获取到price结点吗？

[解决办法]
import org.jdom.xpath.*;

...

XPath xpath = XPath.newInstance( "/bookstore/book/price ");
Element target = (Element)xpath.selectSingleNode(root);
[解决办法]
JDOM我倒不会，不过XSL蛮容易的
<xsl:template match= "/ ">
<xsl:value-of select= "price "/>
</xsl:template>
[解决办法]
SAXBuilder builder = new SAXBuilder();
Document read_doc = builder.build( "bookstore.xml ");
Element root = read_doc.getRootElement();
Element book = root.getChild( "book ");
Element target = book.getChild( "price ");

System.out.println(target);

// price不是root下的节点。
[解决办法]
//匹配以 "// "后指定的子路径的所有元素
//E所有E元素