import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class TestXML {
    
    private static final Logger log = Logger.getLogger(TestXML.class.getName());
    
    public TestXML(){
        super();
    }
    
    /**
     * 构造制定格式的xml
     * @param list
     * @return
     */
    public Document createXML(List list){
        Document document = DocumentHelper.createDocument();
        Element students = document.addElement("students");//根节点 students
        for(int i =0 ;i<list.size() ;i++){
            StudentsInforBean bean = new StudentsInforBean();
            bean = (StudentsInforBean)list.get(i);
            Element student = students.addElement("student"); //子节点 student
            student.addElement("学号").setText(deNull(bean.getId())); 
            student.addElement("姓名").setText(deNull(bean.getName()));
            student.addElement("年龄").setText(String.valueOf(bean.getAge()));
            student.addElement("爱好").setText(deNull(bean.getHab()));
            student.addElement("电话").setText(deNull(bean.getPhone()));
        }
        return document;
    }
    /**
     * 生成xml文件
     * @param document
     * @param filename xml文件的完整路径，包括后缀名
     * @throws Exception
     */
    public void writeXML(Document document ,String filename) throws Exception{
        try {
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF—8");//这个地方是按你题目要求生成的xml编码格式，生成的xml文件用IE打开会有问题，如果换成gb2312的编码就不会有问题
            XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)),format); 
            writer.write(document);
            writer.close(); 
        } catch (IOException e) {
            log.error(e.getMessage());
            throw new Exception("writeXML Exception:"+e.getMessage());
        }
    }
    /**
     * 过滤为null的值
     * @param str
     * @return
     */
    private  String deNull(String str) {
        if (str == null) {
            return "";
        }
        return str;
    }
    
    
    public static void main(String args[]) throws Exception{
        List list = new ArrayList();
        StudentsInforBean bean1 = new StudentsInforBean();
        bean1.setId("2006234");
        bean1.setName("张威");
        bean1.setAge(23);
        bean1.setHab("电脑，音乐");
        bean1.setPhone("3456433");
        StudentsInforBean bean2 = new StudentsInforBean();
        bean2.setId("2006235");
        bean2.setName("刘模");
        bean2.setAge(21);
        bean2.setHab("艺术");
        bean2.setPhone("5677644");
        StudentsInforBean bean3 = new StudentsInforBean();
        bean3.setId("2006236");
        bean3.setName("王民");
        bean3.setAge(22);
        bean3.setHab("艺术");
        bean3.setPhone("3567677");
        list.add(bean1);
        list.add(bean2);
        list.add(bean3);
        //TODO 以上数据的获取，你可以用自己的方法把数据从你对应的数据库表获取
        TestXML testXML = new TestXML();
        Document document = testXML.createXML(list);
        testXML.writeXML(document, "d://test.xml");
    }
}

//数据bean
public class StudentsInforBean implements java.io.Serializable{
    
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    private String id;
    private String name;
    private int age;
    private String hab;
    private String phone;
    
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getHab() {
        return hab;
    }
    public void setHab(String hab) {
        this.hab = hab;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }    
}