Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/xml/BookStore.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<bookstore>
+	<!-- 中文书本信息 -->
+    <book>
+        <title lang="cn">Java并发编程实战</title>
+        <author>Brian Goetz /  Tim Peierls / Joshua Bloch / Joseph Bowbeer / David Holmes / Doug Lea</author> 
+        <year>2012</year>
+        <price>69</price>
+    </book>
+    
+    <!-- 英文书本信息 -->
+    <book>
+        <title lang="en">Java Concurrency in Practice</title>
+        <author>Brian Goetz /  Tim Peierls / Joshua Bloch / Joseph Bowbeer / David Holmes / Doug Lea</author> 
+        <year>2006</year>
+        <price>59.99</price>
+    </book>
+    
+    <book>
+        <title lang="de">德文书</title>
+        <author>德国</author> 
+        <year>2014</year>
+        <price>50</price>
+    </book>
+    
+    <book>
+        <title>没有lang属性</title>
+        <author>试试</author> 
+        <year>2016</year>
+    </book>
+
+</bookstore>

Java/JavaDemo/codedemo/xml/XPathDemo.java

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+package cn.aofeng.demo.xml;
+
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.InputSource;
+
+/**
+ * XPath语法实践。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class XPathDemo {
+
+    public static void main(String[] args) throws XPathExpressionException {
+        InputSource ins = new InputSource(XPathDemo.class.getResourceAsStream("/cn/aofeng/demo/xml/BookStore.xml"));
+        XPathFactory factory = XPathFactory.newInstance();
+        XPath xpath = factory.newXPath();
+        NodeList result = (NodeList) xpath.evaluate("//title[@lang='de']", ins, XPathConstants.NODESET);
+        for (int i = 0; i < result.getLength(); i++) {
+            Node node = result.item(i);
+            StringBuilder buffer = new StringBuilder()
+                .append("NodeName=").append(node.getNodeName()).append(", ")
+                .append("NodeValue=").append(node.getNodeValue()).append(", ")
+                .append("Text=").append(node.getTextContent());
+            System.out.println(buffer.toString());
+        }
+    }
+
+}