java中写XML[转]

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
* 功能：
* @author yaos  email: [e-mail]
* @date 2008 11 25
*/
public class TestParseDOM {

/**
  * 功能:
  * @param args
  * @throws TransformerException 
  */



public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, TransformerException {
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  DocumentBuilder db = dbf.newDocumentBuilder();
  Document doc = db.newDocument();
  
  Element root = doc.createElement("school");
  
  for(int i = 1 ; i <= 3 ; i ++){
   Element grade = doc.createElement("grade");
   grade.setAttribute("level", String.valueOf(i));
   
   for(int j = 1 ; j <= 2 ;  j ++){
    Element classes = doc.createElement("classes");
    classes.setAttribute("name", String.valueOf(j));
    
    Element teacher = doc.createElement("teacher");
    teacher.setTextContent("teacher"+String.valueOf(i+j));
    
    Element monitor = doc.createElement("monitor");
    monitor.setTextContent("stu"+String.valueOf(i+j));
    
    Element number = doc.createElement("number");
    number.setTextContent(String.valueOf(i*j+i*j));
    
    classes.appendChild(teacher);
    classes.appendChild(monitor);
    classes.appendChild(number);
    grade.appendChild(classes);
   }
   root.appendChild(grade);
  }
  doc.appendChild(root);
  
  
  //下面的方法是写xml到.xml的文档
  TransformerFactory tf = TransformerFactory.newInstance();
     Transformer transformer = tf.newTransformer();//此实例可以用于处理来自不同源的 XML，并将转换输出写入各种接收器。
     DOMSource source = new DOMSource(doc);//创建带有 DOM 节点的新输入源
     transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312");//设置转换中实际的输出属性
  transformer.setOutputProperty(OutputKeys.INDENT, "yes");//设置转换中实际的输出属性
  PrintWriter pw = new PrintWriter(new FileOutputStream("src/testDOM.xml"));
     StreamResult result = new StreamResult(pw);//从字节流构造 StreamResult 充当转换结果的持有者，可以为 XML、纯文本、HTML 或某些其他格式的标记
     transformer.transform(source, result);//将 XML Source 转换为 Result
  
}

}









运行之后的结果应该是：

<?xml version="1.0" encoding="GB2312"?>
<school>
<grade level="1">
<classes name="1">
<teacher>teacher2</teacher>
<monitor>stu2</monitor>
<number>2</number>
</classes>
<classes name="2">
<teacher>teacher3</teacher>
<monitor>stu3</monitor>
<number>4</number>
</classes>
</grade>
<grade level="2">
<classes name="1">
<teacher>teacher3</teacher>
<monitor>stu3</monitor>
<number>4</number>
</classes>
<classes name="2">
<teacher>teacher4</teacher>
<monitor>stu4</monitor>
<number>8</number>
</classes>
</grade>
<grade level="3">
<classes name="1">
<teacher>teacher4</teacher>
<monitor>stu4</monitor>
<number>6</number>
</classes>
<classes name="2">
<teacher>teacher5</teacher>
<monitor>stu5</monitor>
<number>12</number>
</classes>
</grade>
</school>