jdom解析xml， API使用、详解、实例说明

package com.aisino.xml;  
  
import java.io.File;  
import java.io.FileWriter;  
import java.io.IOException;  
import java.io.StringReader;  
import java.util.Iterator;  
import java.util.List;  
  
import org.apache.log4j.Logger;  
import org.apache.log4j.PropertyConfigurator;  
import org.jdom.Attribute;  
import org.jdom.Document;  
import org.jdom.Element;  
import org.jdom.JDOMException;  
import org.jdom.input.SAXBuilder;  
import org.jdom.output.Format;  
import org.jdom.output.XMLOutputter;  
  
import com.aisino.util.CommonUtil;  
  
/** 
 *  
 * 功能概要描述 
 *  
 * @category：java学习.jdom.xml 
 * @author <a href="mailto:[email protected]">hanhuayi</a> 
 * @version v1.0，Aug 16, 2013 2:45:16 PM 
 * @see 
 */  
public class XMLParser {  
    static{  
        //手工加载配置文件  
        PropertyConfigurator.configureAndWatch("F:\\workspace\\JavaSample\\log4jj.properties");  
    }  
      
    //文件路径  
    final static String filePath = "F:\\workspace\\JavaSample\\src\\com\\aisino\\xml\\";  
      
    /** 
     * log4j 
     */  
    private static Logger logger = Logger.getLogger(XMLParser.class);  
      
    /** 
     *  
     * 方法功能描述 
     *  
     * @param args 
     * @throws Exception  
     * @return void 
     * @exception 异常描述 
     * @see 
     */  
    public static void main(String[] args) throws Exception {  
        //读文件到内存  
        Document doc = new XMLParser().readXMLFileToDocument(filePath + "students.xml");  
          
        //写Document到文件  
        new XMLParser().writeDocumentToFile(doc, filePath + "service.xml");  
          
        //查询Document  
        new XMLParser().queryXML(doc);  
          
        //添加元素和属性  
        new XMLParser().addElementAndAttributeToDocument(doc);  
          
        //克隆  
        new XMLParser().copyElementAndToTree(doc);  
          
        //修改XML  
        new XMLParser().updateXML(doc);  
          
        //删除XML元素和属性  
        new XMLParser().removeXMLContent(doc);  
          
        new XMLParser().writeDocumentToFile(doc, filePath + "service.xml");  
          
        //内存中的Document->String  
        String docS = new XMLOutputter().outputString(doc);  
        logger.info("docs:" + docS);  
          
        //String->Document  
        Document doc1 = new SAXBuilder().build(new StringReader(docS));  
        new XMLParser().writeDocumentToFile(doc1, "StringToDocument.xml");  
    }  
      
    /** 
     *  
     * 读xml文件到内存 
     *  
     * @param fileName 文件名 
     * @return  
     * @return Document 
     * @exception 异常描述 
     * @see 
     */  
    public Document readXMLFileToDocument(String fileName) {  
        SAXBuilder saxb = new SAXBuilder();  
          
        try {  
            Document doc = saxb.build(new File(fileName));  
            return doc;  
        } catch (JDOMException e) {  
            //e.printStackTrace();  
        } catch (IOException e) {  
            //e.printStackTrace();  
        }  
          
        return null;  
    }  
      
    /** 
     *  
     * 写Document到文件 
     *  
     * @param doc      文件 
     * @param fileName 文件名 
     * @return void 
     * @exception 异常描述 
     * @see 
     */  
    public void writeDocumentToFile(Document doc, String fileName) {  
        XMLOutputter xo = new XMLOutputter(Format.getPrettyFormat());  
          
        try {  
            xo.output(doc, new FileWriter(new File(fileName)));  
        } catch (IOException e) {  
            //e.printStackTrace();  
        }  
    }  
      
    /** 
     *  
     * 查询Document 
     *  
     * @param doc  
     * @return void 
     * @exception 异常描述 
     * @see 
     */  
    @SuppressWarnings("unchecked")  
    public void queryXML(Document doc) {  
        //获得根元素  
        Element rootElement = doc.getRootElement();  
        logger.info("rootElement:" + rootElement);  
          
        //获得根元素的所有孩子元素  
        List rootChildren = rootElement.getChildren();  
        logger.info("rootChildren:" + rootChildren);  
          
        //获得元素的指定名称的所有元素  
        List studentChildren = rootElement.getChildren("student");  
        logger.info("studentChildren:" + studentChildren);  
          
        //获得指定名称的第一个元素  
        Element studentChild = rootElement.getChild("student");  
        logger.info("studentChild:" + studentChild);  
          
        //对studnetChildren进行迭代  
        Iterator studentChildIte = studentChildren.iterator();  
        while(studentChildIte.hasNext()){  
            Element studentElement = (Element)studentChildIte.next();  
              
            //获得元素名称和值  
            String studentName = studentElement.getName();  
            String studentValue = studentElement.getValue();  
            logger.info("studentName:" + studentName);  
            logger.info("studentValue:" + studentValue);  
              
            //获得元素的所有属性  
            List studentAttributes = studentElement.getAttributes();  
            Attribute currentAttribute = studentElement.getAttribute("studentid");  
            logger.info("currentAttribute:" + currentAttribute);  
              
            if(studentAttributes != null){  
                Iterator studentAttrIte = studentAttributes.iterator();  
                while(studentAttrIte.hasNext()){  
                    Attribute currentAttr = (Attribute)studentAttrIte.next();  
                      
                    //取得属性的名称和值  
                    String curAttrName = currentAttr.getName();  
                    String curAttrValue = currentAttr.getValue();  
                    logger.info("curAttrName:" + curAttrName + " curAttrValue:" + curAttrValue);  
                }  
            }  
        }  
    }  
      
    /** 
     *  
     * 向XML中添加元素和属性 
     *  
     * @param doc  
     * @return void 
     * @exception 异常描述 
     * @see 
     */  
    @SuppressWarnings("unchecked")  
    private void addElementAndAttributeToDocument(Document doc) {  
        //根元素  
        Element rootElement = doc.getRootElement();  
          
        //新元素  
        Element companyElement = new Element("aisino");  
        rootElement.addContent(companyElement);  
          
          
        //添加文本值  
        companyElement.setText(CommonUtil.setStrUTF8Encode("航天信息软件"));  
          
        //【第一种】添加属性  
        Attribute addressid = new Attribute("addressid",CommonUtil.setStrUTF8Encode("杏石口路甲18号"));  
        Attribute companygender = new Attribute("gender","3");  
        companyElement.setAttribute(addressid);  
        companyElement.setAttribute(companygender);  
          
        //【第二种】添加属性  
        List companyAttrsList = companyElement.getAttributes();  
        Attribute age = new Attribute("age","5");  
        companyAttrsList.add(age);  
        Attribute people = new Attribute("people","200");  
        companyAttrsList.add(people);  
    }  
      
    /** 
     *  
     * 克隆(复制)XML元素 
     *  
     * @param doc  
     * @return void 
     * @exception 异常描述 
     * @see 
     */  
    private void copyElementAndToTree(Document doc) {  
        Element rootElement = doc.getRootElement();  
          
        //获得指定元素的第一个元素  
        Element studentElement = rootElement.getChild("student");  
          
        //克隆,复制  
        Element cloneStudentElement = (Element)studentElement.clone();  
          
        rootElement.addContent(cloneStudentElement);  
          
        cloneStudentElement.setText("hanhuayi");  
        cloneStudentElement.getAttribute("studentid").setValue("4");  
    }  
      
    /** 
     *  
     * 修改XML 
     *  
     * @param doc  
     * @return void 
     * @exception 异常描述 
     * @see 
     */  
    private void updateXML(Document doc) {  
        Element rootElement = doc.getRootElement();  
          
        //获得指定名称的第一个孩子元素  
        Element studentElement = (Element)rootElement.getChild("student");  
          
        studentElement.setName("stud");  
        studentElement.setText("newText");  
        studentElement.getAttribute("studentid").setValue("11");  
        studentElement.getAttribute("age").setValue("201");  
    }  
      
    /** 
     *  
     * 删除XML元素 
     *  
     * @param doc  
     * @return void 
     * @exception 异常描述 
     * @see 
     */  
    private void removeXMLContent(Document doc) {  
        Element rootElement = doc.getRootElement();  
          
        //获得指定元素的第一个元素  
        Element studentElement = rootElement.getChild("student");  
        rootElement.removeContent(studentElement);  
    }  
}