xml文件和java对象之间转换 博客分类： Java EE xmljava

xml文件和java对象之间转换 例：
package com.zgs.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import com.zgs.entity.Order;
/**
*
* @author Administrator
* 2015-4-6
*
*/
public class XMLUtil{

/**
* 解析XML文件为对象集合
* InputStream Is为Xml文件流
* @return
*/
public static List XMLToList(InputStream Is)throws Exception{
SAXReader saxReader=new SAXReader();
Document doc=saxReader.read(Is);
//获取根元素
Element root=doc.getRootElement();
//获取集合元素
List<Element> orders=root.elements("order");
List<Order> list=new ArrayList<Order>();
//遍历出集合元素的值
for(Element e:orders){
Order o=new Order();
o.setName(e.elementText("name"));
o.setDest(e.elementText("dest"));
o.setFlight(e.elementText("flight"));
o.setTime(e.elementText("time"));
o.setType(e.attributeValue("type"));
list.add(o);
}
return list;
}

public static void listToXML(OutputStream os,List<Order> orders)throws Exception{
//创建doc对象
Document doc=DocumentHelper.createDocument();
//创建根元素
Element root=doc.addElement("orders");
//创建order元素
for(Order o:orders){
Element order=root.addElement("order");
order.addElement("name").setText(o.getName());
order.addElement("dest").setText(o.getDest());
order.addElement("flight").setText(o.getFlight());
order.addElement("time").setText(o.getTime());
order.addAttribute("type", o.getType());

}
//定义输出格式
OutputFormat of=OutputFormat.createPrettyPrint();
//输出list为xml
XMLWriter out=new XMLWriter(os, of);
out.write(doc);
out.close();
os.close();
}


public static void main(String[] args) throws Exception{
// List orders=new ArrayList<Order>();
// Order o1=new Order("zgs", "china", "a322", "2015-01-01", "sw");
// Order o2=new Order("zgs1", "china1", "a3221", "2015-01-01", "sw1");
// orders.add(o1);
// orders.add(o2);
File file=new File("C:\\Users\\Administrator\\Workspaces\\config\\order.xml");
// FileOutputStream fos=new FileOutputStream(file);
// listToXML(fos, orders);
FileInputStream fis=new FileInputStream(file);
List<Order> list=XMLToList(fis);
for(int i=0;i<list.size();i++){
System.out.println(list.get(i).getName());
System.out.println(list.get(i).getDest());
System.out.println(list.get(i).getFlight());
System.out.println(list.get(i).getTime());
System.out.println(list.get(i).getType());
}
}