XML解析实战-优快云博客

本文链接：https://blog.youkuaiyun.com/FutureFlyme/article/details/52965334

本文通过具体实例介绍了如何使用Dom4j和X-Path进行XML文件的读取与解析，包括节点的获取、属性值的读取及条件筛选等内容。

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首先新建一个xml文件

<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
    <book category="COOKING">
        <title lang="en">Everyday Italian</title>
        <author>Giada De Laurentiis</author>
        <year>2005</year>
        <price>30.00</price>
    </book>
    <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>

Dom4j查找XML;需要导入Dom4j的jar包：

package cn.itcast.dom4j;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class DomDemo {
    public static void main(String[] args) throws DocumentException {
        // TODO Auto-generated method stub
        //获取documnet
        Document doc = new SAXReader().read("D:\\MyEclipse10\\day04\\xml\\bookstore.xml");
        //获取根节点
        Element root=doc.getRootElement();
        //获取其他节点
        List<Element>list= root.elements();
        for(Element book:list)
        {
            //获取book的 category
            String value=book.attributeValue("category");
            System.out.println(value);//结果为COOKING CHILDREN WEB
            //获取title的文本
            String text=book.elementText("title");
            System.out.println(text);//结果EverydayItalian Harry Potter Learning XML

        }
    }
}

利用X-Path解析：导入jar包(dom4j.jar和jaxen-1.1-beta-6.jar)：

package cn.itcast.xpath;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class XpathDemo {
    public static void main(String[] args) throws DocumentException {
        // TODO Auto-generated method stub
        //获取根节点
        Document doc=new SAXReader().read("D:\\MyEclipse10\\day04\\xml\\bookstore.xml");
        //获取year
        List<Element> list=doc.selectNodes("//year");
        for(Element year:list )
        {
            System.out.println(year.getText());//结果为2005,2005,2003
        }
        //获取价格大与30的书名
        Element title=(Element) doc.selectSingleNode("//book[price>30]/title");
        Element title1=(Element) doc.selectSingleNode("//book[@category='COOKING']/title");
        System.out.println(title.getText());//结果为Learning XML
        System.out.println(title1.getText());//结果为Everyday Italian
    }
}

XML的解析