java解析XML详解

<?xml-stylesheet type="text/xsl" href="student.xsl"?>

<?xml version="1.0" encoding="gb2312"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<xs:element name="丛书">
		<xs:complexType>
			<xs:sequence>
				<xs:element name="书">
					<xs:element name="名"  minoccurs="1"></xs:element>
					<xs:element name="人"></xs:element>
					<xs:element name="价">
						<xs:attribute name="unit">
							<xs:enumeration value="RMB"/>
							<xs:enumeration value="美元"/>
							<xs:enumeration value="日元"/>
						</xs:attribute>
					</xs:element>
				</xs:element>
		</xs:sequence>
		</xs:complexType>
	</xs:element>
</xs:schema>

public class Text04 {
    public static void main(String[] args) throws Exception {
        //创建文档解析器工厂对象
        DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
        //创建文档解析器对象
        DocumentBuilder builder=factory.newDocumentBuilder();
        //开始解析XML文件
        String path=Thread.currentThread().getContextClassLoader().getResource("db-config.xml").toURI().getPath();
        Document document =builder.parse(new File(path));//dom树，在内存中生成了一颗dom树
        //获取根元素
        Node rootNode=document.getFirstChild();
        //获取根元素的名字
        System.out.println(rootNode.getNodeName());
        //通过根元素获取其他元素
        Node driverNode=document.getElementsByTagName("driver").item(0);
        String driver =driverNode.getTextContent();
        System.out.println(driver);
    }
}

public class Text01 {
    public static void main(String[] args) throws Exception {
        //创建解析器对象
        SAXReader reader=new SAXReader();//虽然使用了SAXReader，但是还是基于DOM的解析方式
        //获取文档对象，还是dom树
        String path=Thread.currentThread().getContextClassLoader().getResource("db-config.xml").toURI().getPath();
        Document document= reader.read(new File(path));
        //获取根元素
        Element rootElement=document.getRootElement();
        //System.out.println(element.getName());
        //获取driver元素
        Element driverElement =rootElement.element("driver");
        //在获取文本
        String driver=driverElement.getText();
        //System.out.println(driver);
        //直接获取元素的文本内容
        driver=rootElement.elementText("driver");
        System.out.println(driver);
        System.out.println(rootElement.elementText("url"));
        System.out.println(rootElement.elementText("user"));
        System.out.println(rootElement.elementText("password"));

    }
}

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

import java.io.File;
import java.io.FileWriter;


public class Text02 {
    public static void main(String[] args) throws Exception {
        //创建文档对象
        Document document= DocumentHelper.createDocument();

        //添加根元素
        Element studentInfoElt=document.addElement("学生信息");

        //给学生信息节点添加子节点学生节点
        Element studentElt=studentInfoElt.addElement("学生");

        //给学生节点添加id属性
        studentElt.addAttribute("id","110");

        //给学生节点添加名字字节点
        Element nameElt=studentElt.addElement("名字");

        //设置名字节点文本
        nameElt.setText("张三");

        //给学生节点添加性别字节点
        Element sexElt=studentElt.addElement("性别");

        //设置名字节点文本
        sexElt.setText("男");

        //开始写
        OutputFormat format= OutputFormat.createPrettyPrint();
        format.setEncoding("utf-8");

        String path="students.xml";
        XMLWriter xmlWriter=new XMLWriter(new FileWriter(new File(path)),format);

        xmlWriter.write(document);
        xmlWriter.close();


    }
}