xml的写：
code：
1 import java.io.File; 2 import java.io.StringWriter; 3 4 import javax.xml.parsers.DocumentBuilder; 5 import javax.xml.parsers.DocumentBuilderFactory; 6 import javax.xml.parsers.ParserConfigurationException; 7 import javax.xml.transform.Transformer; 8 import javax.xml.transform.TransformerConfigurationException; 9 import javax.xml.transform.TransformerException;10 import javax.xml.transform.TransformerFactory;11 import javax.xml.transform.dom.DOMSource;12 import javax.xml.transform.stream.StreamResult;13 14 import org.w3c.dom.Document;15 import org.w3c.dom.Element;16 17 public class WriteXML {18 19 public static void main(String[] args) {20 21 try {22 23 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();24 DocumentBuilder builder = factory.newDocumentBuilder();25 Document document = builder.newDocument();26 Element root = document.createElement("Languages");27 root.setAttribute("cat", "it");28 29 Element lan1 = document.createElement("lan");30 lan1.setAttribute("id", "1");31 Element name1 = document.createElement("name");32 Element ide1 = document.createElement("ide");33 name1.setTextContent("Java");34 ide1.setTextContent("eclipse");35 lan1.appendChild(name1);36 lan1.appendChild(ide1);37 38 Element lan2 = document.createElement("lan");39 lan1.setAttribute("id", "2");40 Element name2 = document.createElement("name");41 Element ide2 = document.createElement("ide");42 name2.setTextContent("Swift");43 ide2.setTextContent("Xcode");44 lan2.appendChild(name2);45 lan2.appendChild(ide2);46 47 Element lan3 = document.createElement("lan");48 lan3.setAttribute("id", "3");49 Element name3 = document.createElement("name");50 Element ide3 = document.createElement("ide");51 name3.setTextContent("C#");52 ide3.setTextContent("Visual Studio");53 lan3.appendChild(name3);54 lan3.appendChild(ide3);55 56 root.appendChild(lan1);57 root.appendChild(lan2);58 root.appendChild(lan3);59 document.appendChild(root);60 61 //-----------------------62 63 TransformerFactory transformerFactory = TransformerFactory.newInstance();64 Transformer tansformer = transformerFactory.newTransformer();65 StringWriter writer = new StringWriter();66 tansformer.transform(new DOMSource(document), new StreamResult(writer));67 System.out.println(writer.toString());//输出到控制台68 69 70 tansformer.transform(new DOMSource(document), new StreamResult(new File("newxml.xml")));//输出到xml文本71 } catch (ParserConfigurationException e) {72 73 e.printStackTrace();74 } catch (TransformerConfigurationException e) {75 e.printStackTrace();76 } catch (TransformerException e) {77 78 e.printStackTrace();79 }80 }81 82 } code：
1 import java.io.File; 2 import java.io.IOException; 3 4 import javax.xml.parsers.DocumentBuilder; 5 import javax.xml.parsers.DocumentBuilderFactory; 6 import javax.xml.parsers.ParserConfigurationException; 7 8 import org.w3c.dom.Document; 9 import org.w3c.dom.Element;10 import org.w3c.dom.Node;11 import org.w3c.dom.NodeList;12 import org.xml.sax.SAXException;13 14 public class TestReadXML {15 16 public static void main(String[] args) {17 //DOM18 try {19 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();20 DocumentBuilder builder = factory.newDocumentBuilder();21 Document document = builder.parse(new File("languages.xml"));22 Element root = document.getDocumentElement();//获取根元素23 System.out.println("cat="+root.getAttribute("cat"));24 NodeList list = root.getElementsByTagName("lan");//获取子元素lan25 for(int i=0;i