DOM

• XML

<beans xmlns="http://www.springframework.org/schema/beans">
    <bean id="wheel" class="com.titizz.simulation.toyspring.Wheel">
        <property name="brand" value="Michelin" />
        <property name="specification" value="265/60 R18" />
    </bean>

    <bean id="car" class="com.titizz.simulation.toyspring.Car">
        <property name="name" value="Mercedes Benz G 500"/>
        <property name="length" value="4717mm"/>
        <property name="width" value="1855mm"/>
        <property name="height" value="1949mm"/>
        <property name="wheel" ref="wheel"/>
    </bean>
</beans>

• DOM

DOM中所有结构都是节点(Node)，包括：元素节点，属性节点，文本节点(回车也是文本节点)
元素节点(Element)中包含：属性节点，文本节点，子元素节点
<元素节点 属性节点>
    文本节点
</元素节点>

• Parse

public class ParseTest {
    @Test
    public void testParseDOM() throws Exception {
        URL url = ParseTest.class.getClassLoader().getResource("toy-spring-ioc.xml");
        System.out.println(url);
        String location = url.getFile();
        System.out.println(location);
        // 加载 xml 配置文件
        InputStream inputStream = new FileInputStream(location);
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = factory.newDocumentBuilder();
        Document doc = docBuilder.parse(inputStream);

        Element rt = doc.getDocumentElement();
        System.out.println(rt.getTagName());

        System.out.println("-----------------------------------------------");

        /*
        * DOM中所有结构都是节点，包括：元素节点，属性节点，文本节点(回车也是文本节点)
        * 元素节点中包含：属性节点，文本节点，子元素节点
        *
        * Node：节点
        * Element：元素节点
        *
        * */
        NodeList nodes = rt.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.item(i);
            //文本节点
            if (node instanceof Text){
                Text text = (Text) node;
                System.out.println(text.getWholeText());
            }
            //元素节点
            if(node instanceof Element){
                Element ele = (Element) node;
                System.out.println(ele.getTagName());
                System.out.println("id  :  " + ele.getAttribute("id"));
                System.out.println("class  :  " + ele.getAttribute("class"));
                //子元素节点
                NodeList properties = ele.getChildNodes();
                for (int j = 0; j < properties.getLength(); j++) {
                    Node propertyNode = properties.item(j);
                    if(propertyNode instanceof Element){
                        Element property = (Element) propertyNode;
                        System.out.print(property.getAttribute("name") + " : ");
                        if (property.hasAttribute("value")) {
                            System.out.println(property.getAttribute("value"));
                        }else if (property.hasAttribute("ref")){
                            System.out.println(property.getAttribute("ref"));
                        }
                    }
                }
            }
        }
    }
}