Java 生成和解析xml文件

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;

/**
 * 
 *DOM生成与解析XML文档
 */
public class DomDemo implements XmlDocument {
  private Document document;
  private String fileName;

  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("employees");
    this.document.appendChild(root);
    Element employee = this.document.createElement("employee");
    Element name = this.document.createElement("name");
    name.appendChild(this.document.createTextNode("丁宏亮"));
    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("30"));
    employee.appendChild(age);
    root.appendChild(employee);
    TransformerFactory tf = TransformerFactory.newInstance();
    try {
      Transformer transformer = tf.newTransformer();
      DOMSource source = new DOMSource(document);
      transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
      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());
    }
  }
  
  public static void main(String[] args) {
    String path = "D:/text.xml";
    
    DomDemo dom = new DomDemo();
    dom.init();
    
    //dom.createXml(path);
    dom.parserXml("D:/realTimeDevice.xml");
    //dom.parserXml("D:/coalDatabase.xml");
  }
}