使用JAXP对xml文档进行Dom解析

「爱情、让人受尽委屈。」 2022-04-10 05:13 237阅读 0赞

package cn.xue.xml;
    
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;
    import javax.xml.parsers.ParserConfigurationException;
    import javax.xml.transform.Transformer;
    import javax.xml.transform.TransformerFactory;
    import javax.xml.transform.dom.DOMSource;
    import javax.xml.transform.stream.StreamResult;
    
    import org.junit.Test;
    import org.w3c.dom.Document;
    import org.w3c.dom.Element;
    import org.w3c.dom.Node;
    import org.w3c.dom.NodeList;
    import org.xml.sax.SAXException;
    
    
    //使用dom方式对xml文档进行crud
    public class Test2 {
    	
    	//读取xml文档中：<书名>JavaScript网页开发</书名> 节点中的值
    	@Test
    	public void read1() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		NodeList list = document.getElementsByTagName("书名");
    		Node node = list.item(1);
    		String content = node.getTextContent();
    		System.out.println(content);
    	}
    	
    	//得到xml文档中所有的标签
    	@Test
    	public void read2() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		//得到根节点
    		Node root = document.getElementsByTagName("书架").item(0);
    		
    		list(root);
    	}
    
    	private void list(Node node) {
    		if(node instanceof Element){
    			System.out.println(node.getNodeName());
    		}
    		NodeList list = node.getChildNodes();
    		for(int i = 0; i < list.getLength(); i++)
    		{
    			Node child = list.item(i);
    			list(child);
    		}	
    	}
    	
    	//得到xml文档中标签属性的值：<书名 name = "xxxx">Java就业培训教程</书名>
    	@Test
    	public void read3() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		Element bookname = (Element) document.getElementsByTagName("书名").item(0);
    		String value = bookname.getAttribute("name");
    		System.out.println(value);
    		
    	}
    	
    	//向xml文档中添加节点：<售价>59.00元</售价>
    	@Test
    	public void add1() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		//创建节点
    		Element price = document.createElement("售价");
    		price.setTextContent("59.00元");
    		
    		//把节点挂在第一本书上
    		Element book = (Element) document.getElementsByTagName("书").item(0);
    		book.appendChild(price);
    		
    		//把更新后的内存写回到xml文档
    		TransformerFactory tffactory = TransformerFactory.newInstance();
    		Transformer tf = tffactory.newTransformer();
    		tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
    	}
    	
    	//向xml文档中指定位置插入节点：<售价>59.00元</售价>
    	@Test
    	public void add2() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		//创建节点
    		Element price = document.createElement("售价");
    		price.setTextContent("59.00元");
    		
    		//得到参考节点
    		Element refNode = (Element) document.getElementsByTagName("售价").item(0);
    		
    		//得到挂崽的节点
    		Element book = (Element) document.getElementsByTagName("书").item(0);
    		
    		//往book节点的指定位置挂崽
    		book.insertBefore(price, refNode);
    		
    		//把更新后的内存写回到xml文档
    		TransformerFactory tffactory = TransformerFactory.newInstance();
    		Transformer tf = tffactory.newTransformer();
    		tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
    	}
    	
    	//向xml文档节点上添加属性：<书名>Java就业培训教程</书名>上添加name="xxxx"属性
    	@Test
    	public void addAttr() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		Element bookname = (Element) document.getElementsByTagName("书名").item(0);
    		
    		bookname.setAttribute("name", "xxxx");
    		
    		//把更新后的内存写回到xml文档
    		TransformerFactory tffactory = TransformerFactory.newInstance();
    		Transformer tf = tffactory.newTransformer();
    		tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
    	}
    	
    	@Test
    	public void delete1() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		//得到要删除的节点
    		Element e = (Element) document.getElementsByTagName("售价").item(0);
    		
    		//得到要删除节点的爸爸
    		Element book = (Element) document.getElementsByTagName("书").item(0);
    		
    		//爸爸再删崽
    		book.removeChild(e);
    		
    		//把更新后的内存写回到xml文档
    		TransformerFactory tffactory = TransformerFactory.newInstance();
    		Transformer tf = tffactory.newTransformer();
    		tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
    		
    	}
    	
    	//删除整个xml文档
    	@Test
    	public void delete2() throws Exception{
    		
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		//得到要删除的节点
    		Element e = (Element) document.getElementsByTagName("售价").item(0);
    		e.getParentNode().getParentNode().getParentNode().removeChild(e.getParentNode().getParentNode());
    		
    		//把更新后的内存写回到xml文档
    		TransformerFactory tffactory = TransformerFactory.newInstance();
    		Transformer tf = tffactory.newTransformer();
    		tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
    	}
    	
    	@Test
    	public void update() throws Exception{
    
    		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    		DocumentBuilder builder = factory.newDocumentBuilder();
    		Document document = builder.parse("src/book.xml");
    		
    		Element e = (Element) document.getElementsByTagName("售价").item(0);
    		e.setTextContent("109.00元");
    		
    		//把更新后的内存写回到xml文档
    		TransformerFactory tffactory = TransformerFactory.newInstance();
    		Transformer tf = tffactory.newTransformer();
    		tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
    		
    	}
    	
    	
    
    }