java通过dom创建和解析xml

import java.io.FileNotFoundException; 

import java.io.FileOutputStream; 

import java.io.IOException; 

import java.io.PrintWriter; 

import javax.xml.parsers.DocumentBuilder; 

import javax.xml.parsers.DocumentBuilderFactory; 

import javax.xml.parsers.ParserConfigurationException; 

import javax.xml.transform.OutputKeys; 

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.Node; 

import org.w3c.dom.NodeList; 

import org.xml.sax.SAXException; 





public class MyXmlTest{ 

    private Document document; 

  

    public void init() { 

        try { 

            DocumentBuilderFactory factory = DocumentBuilderFactory 

                    .newInstance(); 

            DocumentBuilder builder = factory.newDocumentBuilder(); 

            this.document = builder.newDocument(); 

        } catch (ParserConfigurationException e) { 

            System.out.println(e.getMessage()); 

        } 

    } 

  

    public void createXml(String fileName) { 

        Element root = this.document.createElement("scores");  

        this.document.appendChild(root);  

        Element employee = this.document.createElement("employee");  

        Element name = this.document.createElement("name");  

        name.appendChild(this.document.createTextNode("wangchenyang"));  

        employee.appendChild(name);  

        Element sex = this.document.createElement("sex");  

        sex.appendChild(this.document.createTextNode("m"));  

        employee.appendChild(sex);  

        Element age = this.document.createElement("age");  

        age.appendChild(this.document.createTextNode("26"));  

        employee.appendChild(age);  

        root.appendChild(employee);  

        TransformerFactory tf = TransformerFactory.newInstance(); 

        try { 

            Transformer transformer = tf.newTransformer(); 

            DOMSource source = new DOMSource(document); 

            transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312"); 

            transformer.setOutputProperty(OutputKeys.INDENT, "yes"); 

            PrintWriter pw = new PrintWriter(new FileOutputStream(fileName)); 

            StreamResult result = new StreamResult(pw); 

            transformer.transform(source, result); 

            System.out.println("生成XML文件成功!"); 

        } catch (TransformerConfigurationException e) { 

            System.out.println(e.getMessage()); 

        } catch (IllegalArgumentException e) { 

            System.out.println(e.getMessage()); 

        } catch (FileNotFoundException e) { 

            System.out.println(e.getMessage()); 

        } catch (TransformerException e) { 

            System.out.println(e.getMessage()); 

        } 

    } 

  

    public void parserXml(String fileName) { 

        try { 

            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 

            DocumentBuilder db = dbf.newDocumentBuilder(); 

            Document document = db.parse(fileName); 

              

            NodeList employees = document.getChildNodes(); 

            for (int i = 0; i < employees.getLength(); i++) { 

                Node employee = employees.item(i); 

                NodeList employeeInfo = employee.getChildNodes(); 

                for (int j = 0; j < employeeInfo.getLength(); j++) { 

                    Node node = employeeInfo.item(j); 

                    NodeList employeeMeta = node.getChildNodes(); 

                    for (int k = 0; k < employeeMeta.getLength(); k++) { 

                        System.out.println(employeeMeta.item(k).getNodeName() 

                                + ":" + employeeMeta.item(k).getTextContent()); 

                    } 

                } 

            } 

            System.out.println("解析完毕"); 

        } catch (FileNotFoundException e) { 

            System.out.println(e.getMessage()); 

        } catch (ParserConfigurationException e) { 

            System.out.println(e.getMessage()); 

        } catch (SAXException e) { 

            System.out.println(e.getMessage()); 

        } catch (IOException e) { 

            System.out.println(e.getMessage()); 

        } 

    } 

//测试



  

    public static void main(String args[]){ 

    	MyXmlTest dd=new MyXmlTest(); 

        String str="D:/grade.xml"; 

        dd.init(); 

        dd.createXml(str);    //创建xml 

        dd.parserXml(str);    //读取xml 

    } 

}