Java生成和解析XML格式文件和字符串的实例代码

   
       
            599
            CMCC
       
       
            699
            ChinaNet
       
   

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.StringReader;

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;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class XMLHandler {
    public XMLHandler(){
       
    }
   
    public String createXML(){
        String xmlStr = null;
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.newDocument();
            document.setXmlVersion(“1.0”);
           
            Element root = document.createElement(“root”);
            document.appendCh来源gao@dai!ma.com搞$代^码网ild(root);
           
            Element telephone = document.createElement(“TelePhone”);
           
            Element nokia = document.createElement(“type”);
            nokia.setAttribute(“name”, “nokia”);
           
            Element priceNokia = document.createElement(“price”);
            priceNokia.setTextContent(“599”);
            nokia.appendChild(priceNokia);
           
            Element operatorNokia = document.createElement(“operator”);
            operatorNokia.setTextContent(“CMCC”);
            nokia.appendChild(operatorNokia);
           
            telephone.appendChild(nokia);
           
            Element xiaomi = document.createElement(“type”);
            xiaomi.setAttribute(“name”, “xiaomi”);
           
            Element priceXiaoMi = document.createElement(“price”);
            priceXiaoMi.setTextContent(“699”);
            xiaomi.appendChild(priceXiaoMi);
           
            Element operatorXiaoMi = document.createElement(“operator”);
            operatorXiaoMi.setTextContent(“ChinaNet”);
            xiaomi.appendChild(operatorXiaoMi);
           
            telephone.appendChild(xiaomi);
           
            root.appendChild(telephone);
           
            TransformerFactory transFactory = TransformerFactory.newInstance();
            Transformer transFormer = transFactory.newTransformer();
            DOMSource domSource = new DOMSource(document);
           
            //export string
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            transFormer.transform(domSource, new StreamResult(bos));
            xmlStr = bos.toString();
           
            //——-
            //save as file
            File file = new File(“TelePhone.xml”);
            if(!file.exists()){
                file.createNewFile();
            }
            FileOutputStream out = new FileOutputStream(file);
            StreamResult xmlResult = new StreamResult(out);
            transFormer.transform(domSource, xmlResult);
            //——–
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (TransformerConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (TransformerException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
       
        return xmlStr;
    }
   
    public void parserXML(String strXML){
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            StringReader sr = new StringReader(strXML);
            InputSource is = new InputSource(sr);
            Document doc = builder.parse(is);
            Element rootElement = doc.getDocumentElement();
            NodeList phones = rootElement.getElementsByTagName(“type”);
            for (int i = 0; i <phones.getLength(); i++) {
                Node type = phones.item(i);
                String phoneName = ((Element)type).getAttribute(“name”);
                System.out.println(“Phone name = “+phoneName);
                NodeList properties = type.getChildNodes();
                for (int j = 0; j <properties.getLength(); j++) {
                    Node property = properties.item(j);
                    String nodeName = property.getNodeName();
                    if (nodeName.equals(“price”)) {
                        String price=property.getFirstChild().getNodeValue();
                        System.out.println(“price=”+price);
                    } else if (nodeName.equals(“operator”)) {
                        String operator=property.getFirstChild().getNodeValue();
                        System.out.println(“operator=”+operator);
                    }
                }
            }
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
   
    public static void main(String[] args) {
        XMLHandler handler = new XMLHandler();
        String xml = handler.createXML();
        System.out.println(xml);
        handler.parserXML(xml);
    }
}