Dom4j操作xml

package com.kk.xml;



import java.io.*;

import java.util.*;



import org.dom4j.*;

import org.dom4j.io.*;



public class OperateXML {



    /**

     * @param args

     * @throws IOException 

     * @throws DocumentException 

     */

    public static void main(String[] args) throws IOException, DocumentException {

        generateXML();

        parseXMLFromString();

    }



    /**

     * 将生成的xml以字符串形式打印

     * @throws IOException

     */

    private static void generateXML() throws IOException {

        Document document=DocumentHelper.createDocument();

        Element message=document.addElement("message");

        message.addAttribute("type", "GetAllDefence");

        Element students=message.addElement("students");

        for(int i=0;i<10;i++){

            Element student=students.addElement("student");

            student.addElement("name").setText("my name is"+i);

            student.addElement("gender").setText("男");

        }

        System.out.println(document.asXML());

    }

    

    /**

     * 将生成的xml以字符串形式打印(字节流)

     * @throws IOException

     */

    private static void generateXMLByStream() throws IOException {

        Document document=DocumentHelper.createDocument();

        Element message=document.addElement("message");

        message.addAttribute("type", "GetAllDefence");

        Element students=message.addElement("students");

        for(int i=0;i<10;i++){

            Element student=students.addElement("student");

            student.addElement("name").setText("my name is"+i);

            student.addElement("gender").setText("男");

        }

        OutputStream os=new ByteArrayOutputStream();

        OutputFormat format=OutputFormat.createPrettyPrint();

        format.setEncoding("utf-8");

        XMLWriter output=new XMLWriter(os,format);

        output.write(document);

        output.close();

        String str=os.toString();

        os.close();

        System.out.println(str);        

    }

    

    private static void parseXMLFromFile() throws DocumentException{

        SAXReader reader=new SAXReader();

        Document document=reader.read("students.xml"); //读流

        Element root=document.getRootElement(); //message

        //for(Iterator it=root.selectNodes("//students/student").iterator();it.hasNext();){ //xpath方式,需要jaxen.jar

        for(Iterator it=root.element("students").elementIterator("student");it.hasNext();){

            Element student=(Element) it.next();

            System.out.println(student.elementTextTrim("name"));

            System.out.println(student.elementTextTrim("gender"));

        }

    }

    

    private static void parseXMLFromString() throws DocumentException{

        String xml="<?xml version=\"1.0\" encoding=\"gbk\"?>"

                    +"<message type=\"GetAllDefence\">"

                    +"<students>"

                    +"<student num=\"0\">"

                    +"<name>my name is0</name>"

                    +"<gender>男</gender>"

                    +"</student>"

                    +"</students>"

                    +"</message>";

        Document document=DocumentHelper.parseText(xml); //读字符串

        Element root=document.getRootElement(); //message

        for(Iterator it=root.element("students").elementIterator("student");it.hasNext();){

            Element student=(Element) it.next();

            System.out.println(student.elementTextTrim("name"));

            System.out.println(student.elementTextTrim("gender"));

        }

    }



}