XML解析之使用DOM分析操作XML文档

来源：互联网发布：网络用语py什么意思编辑：程序博客网时间：2024/06/07 05:12
package forXML;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;import javax.xml.transform.TransformerException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.NamedNodeMap;import org.w3c.dom.Node;import org.w3c.dom.NodeList;/** * xml解析，你们喜欢的实验报告哟~~~哈哈哈 *  * @author 焦含寒 * */public class XMLParser {    //遍历xml文件    public static void travelXML(Document doc) {        NodeList classList = doc.getElementsByTagName("班级");        for(int i=0;i<classList.getLength();i++){            Element clas = (Element) classList.item(i);            System.out.println("代号："+clas.getAttribute("代号"));        }        NodeList stuList = doc.getElementsByTagName("学生");        for(int i = 0;i<stuList.getLength();i++){            Element stu = (Element) stuList.item(i);            System.out.println("name:"+stu.getAttribute("name"));            NodeList scoNode = stu.getElementsByTagName("各科成绩");            Element sco = (Element) scoNode.item(0);            NodeList couList = sco.getElementsByTagName("Course");            NodeList scoList = sco.getElementsByTagName("Score");            for(int j = 0;j<couList.getLength() && j<scoList.getLength();j++){                System.out.print(couList.item(j).getTextContent()+":");                System.out.println(scoList.item(j).getTextContent());            }        }    }    //查找某个学生(宋江)的各科成绩    public static void query(Document doc){        NodeList list = doc.getElementsByTagName("学生");        for(int i=0;i<list.getLength();i++){            Element stu = (Element) list.item(i);            if(stu.getAttribute("name").equals("宋江")){                NodeList couList = stu.getElementsByTagName("Course");                NodeList scoList = stu.getElementsByTagName("Score");                for(int j=0;j<couList.getLength() && j<scoList.getLength();j++){                    System.out.print(couList.item(j).getTextContent());                    System.out.println(scoList.item(j).getTextContent());                }            }        }    }    //添加一个学生节点（武松）的各科成绩    public static void add(Document doc) throws TransformerException{        //创建学生节点        Element newStu = doc.createElement("学生");        //添加属性        newStu.setAttribute("name", "武松");        Element newStu_sco = doc.createElement("各科成绩");        Element newStu_cou1 = doc.createElement("Course");        newStu_cou1.setTextContent("计算机基础");        Element newStu_sco1 = doc.createElement("Score");        newStu_sco1.setTextContent("99");        Element newStu_cou2 = doc.createElement("Course");        newStu_cou2.setTextContent("C语言");        Element newStu_sco2 = doc.createElement("Score");        newStu_sco2.setTextContent("90");        Element newStu_cou3 = doc.createElement("Course");        newStu_cou3.setTextContent("计算机网络");        Element newStu_sco3 = doc.createElement("Score");        newStu_sco3.setTextContent("95");        Element newStu_cou4 = doc.createElement("Course");        newStu_cou4.setTextContent("XML技术");        Element newStu_sco4 = doc.createElement("Score");        newStu_sco4.setTextContent("100");        newStu_sco.appendChild(newStu_cou1);        newStu_sco.appendChild(newStu_sco1);        newStu_sco.appendChild(newStu_cou2);        newStu_sco.appendChild(newStu_sco2);        newStu_sco.appendChild(newStu_cou3);        newStu_sco.appendChild(newStu_sco3);        newStu_sco.appendChild(newStu_cou4);        newStu_sco.appendChild(newStu_sco4);        //把各科成绩节点挂在”武松“节点下面        newStu.appendChild(newStu_sco);        //把”武松“节点挂在doc节点下        doc.getDocumentElement().appendChild(newStu);        //更新xml文件        TransformerFactory tFactory = TransformerFactory.newInstance();        Transformer transformer = tFactory.newTransformer();        transformer.transform(new DOMSource(doc), new StreamResult("src/forXML/scoreList.xml"));    }    //删除”宋江“节点    public static void delete(Document doc) throws TransformerException{        NodeList list = doc.getElementsByTagName("学生");        for(int i=0;i<list.getLength();i++){            Element stu = (Element) list.item(i);            if(stu.getAttribute("name").equals("宋江")){//              Node node = stu.getElementsByTagName("各科成绩").item(0);//              node.getParentNode().removeChild(node);                stu.getParentNode().removeChild(stu);            }        }        //更新xml文件        TransformerFactory tFactory = TransformerFactory.newInstance();        Transformer transformer = tFactory.newTransformer();        transformer.transform(new DOMSource(doc), new StreamResult("src/forXML/scoreList.xml"));    }    public static void main(String[] args) {        // TODO Auto-generated method stub        try {            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();            DocumentBuilder builder = factory.newDocumentBuilder();            Document doc = builder.parse("src/forXML/scoreList.xml");            travelXML(doc);            System.out.println("-------------我是一条可爱的分解线--------------");            query(doc);            add(doc);            delete(doc);            System.out.println("-------------我是一条可爱的分解线--------------");            travelXML(doc);        } catch (Exception e) {            e.printStackTrace();        }    }}
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