XML操作

一、使用Java读取XML文件

import java.io.File;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

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 ReadXML {

    public static void main(String[] args) {
        try {
            
            
            //DOM
            DocumentBuilderFactory factory  = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(new File("languages.xml"));
            Element root = document.getDocumentElement();
            System.out.println("cat="+root.getAttribute("cat"));
            NodeList list = root.getElementsByTagName("lan");
            for (int i = 0; i < list.getLength(); i++) {
                Element lan = (Element) list.item(i);
                System.out.println("---------------");
                System.out.println("id="+lan.getAttribute("id"));
                
                NodeList clist = lan.getChildNodes();
　　　　　　　　  //注意这里的clist含有空白的回车和空格区
                for (int j = 0; j < clist.getLength(); j++) {
                    Node c = clist.item(j);
                    if (c instanceof Element) {
                        System.out.println(c.getNodeName()+"="+c.getTextContent());
                    }
                }
            }
            
            
            
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

二、使用Java创建XML

import java.io.File;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
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;


public class CreatXML {

    public static void main(String[] args) {
        try {
            
            
            //DOM
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.newDocument();
            Element root = document.createElement("Languages");
            root.setAttribute("cat", "it");
            
            Element lan1 = document.createElement("lan");
            lan1.setAttribute("id", "1");
            Element name1 = document.createElement("name");
            name1.setTextContent("Java");
            Element ide1 = document.createElement("ide");
            ide1.setTextContent("Eclipse");
            lan1.appendChild(name1);
            lan1.appendChild(ide1);
            
            Element lan2 = document.createElement("lan");
            lan2.setAttribute("id", "2");
            Element name2 = document.createElement("name");
            name2.setTextContent("Swift");
            Element ide2 = document.createElement("ide");
            ide2.setTextContent("XCode");
            lan2.appendChild(name2);
            lan2.appendChild(ide2);
            
            Element lan3 = document.createElement("lan");
            lan3.setAttribute("id", "3");
            Element name3 = document.createElement("name");
            name3.setTextContent("C#");
            Element ide3 = document.createElement("ide");
            ide3.setTextContent("Visual Studio");
            lan3.appendChild(name3);
            lan3.appendChild(ide3);
            
            root.appendChild(lan1);
            root.appendChild(lan2);
            root.appendChild(lan3);
            document.appendChild(root);
            
            //-------------
            
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty("encoding", "UTF-8");
            
            StringWriter writer = new StringWriter();
            transformer.transform(new DOMSource(document), new StreamResult(writer));
            System.out.println(writer.toString());
            
            transformer.transform(new DOMSource(document), new StreamResult(new File("newxml.xml")));
            
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerException e) {
            e.printStackTrace();
        }
    }

}

三、使用dom4j工具类库操作XML （www.dom4j.org）

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;


public class Test {

    public static void main(String[] args) {
        String xmlString = "<root><people>ACELY</people></root>";
        
        try {
            
            
            
            Document document = DocumentHelper.parseText(xmlString);
            
            System.out.println(document.asXML());
            
            
            
        } catch (DocumentException e) {
            e.printStackTrace();
        }
    }

}