java解析这段xml：<?xml version="1.0" encoding="UTF-8"?><bookstore> <book category="children"> <title lang="en">Harry Potter</title> <author>J.K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book category="web"> <title lang="en">Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book></bookstore>

可以使用Java中的DOM（文档对象模型）解析器来解析XML文档。

以下是一个示例代码，它使用DOM解析器来解析上述XML文档，并输出每个书籍的标题、作者、年份和价格：

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;

public class XMLParser {

  public static void main(String[] args) {

    try {
      // 创建DOM解析器工厂
      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      // 创建DOM解析器
      DocumentBuilder builder = factory.newDocumentBuilder();
      // 解析XML文档
      Document doc = builder.parse("bookstore.xml");

      // 获取所有book元素
      NodeList bookList = doc.getElementsByTagName("book");
      // 遍历book元素
      for (int i = 0; i < bookList.getLength(); i++) {
        Element book = (Element) bookList.item(i);
        // 获取title元素
        Element title = (Element) book.getElementsByTagName("title").item(0);
        // 获取author元素
        Element author = (Element) book.getElementsByTagName("author").item(0);
        // 获取year元素
        Element year = (Element) book.getElementsByTagName("year").item(0);
        // 获取price元素
        Element price = (Element) book.getElementsByTagName("price").item(0);

        // 输出书籍信息
        System.out.println("Title: " + title.getTextContent());
        System.out.println("Author: " + author.getTextContent());
        System.out.println("Year: " + year.getTextContent());
        System.out.println("Price: " + price.getTextContent());
        System.out.println("==============================");
      }

    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

输出结果如下：

Title: Harry Potter
Author: J.K. Rowling
Year: 2005
Price: 29.99
==============================
Title: Learning XML
Author: Erik T. Ray
Year: 2003
Price: 39.95
==============================