xstream产生xml和java bean

转：

/**
 *@author: chenyoulong 
 *@Title:PersonTest.java
 *@date 2012-9-28 下午3:25:09 
 *@Description:TODO
 */
package com.test;

import java.util.ArrayList;
import java.util.List;

import com.entity.PersonBean;
import com.entity.PersonBean.Animal;
import com.entity.PersonBean.Friends;
import com.entity.PersonBean.Pets;
import com.entity.PersonBean.PhoneNumber;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;

/**
 * @ClassName:PersonTest
 * @author: chenyoulong Email: [email protected]
 * @date :2012-9-28 下午3:25:09
 * @Description:TODO
 */
public class PersonTest {

	/**
	 * @Title: main
	 * @Description: TODO
	 * @param args
	 * @return void
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		// toXml
		// String xmlStr=new PersonTest().toXml();

		// toBean
		PersonBean per = new PersonTest().toBean();
		// String xmlStr="<person>"+
		// "<firstName>chen</firstName>"+
		// "<lastName>youlong</lastName>"+
		// "<telphone>"+
		// "<code>137280</code>"+
		// "<number>137280968</number>"+
		// "</telphone>"+
		// "<faxphone>"+
		// "<code>20</code>"+
		// "<number>020221327</number>"+
		// "</faxphone>"+
		// "<friends>"+
		// "<name>A1</name>"+
		// "<name>A2</name>"+
		// "<name>A3</name>"+
		// "</friends>"+
		// "<pets>"+
		// "<pet>"+
		// "<name>doly</name>"+
		// "<age>2</age>"+
		// "</pet>"+
		// "<pet>"+
		// "<name>Ketty</name>"+
		// "<age>2</age>"+
		// "</pet>"+
		// "</pets>"+
		// "</person>";
		// PersonBean person=XmlUtil.toBean(xmlStr, PersonBean.class);
		// System.out.println("person=firstname=="+person.getFirstName());
		// System.out.println("person==Friends==name1=="+person.getFriend().getName().get(0));
		// System.out.println("person==Pets==name2=="+person.getPet().getAnimalList().get(1).getName());
		//
	}

	/**
	 * 注解生产xml
	 * 
	 * @Title: toXml
	 * @Description: TODO
	 * @return String
	 */
	public String toXml() {
		PersonBean per = new PersonBean();
		per.setFirstName("chen");
		per.setLastName("youlong");

		PhoneNumber tel = new PhoneNumber();
		tel.setCode(137280);
		tel.setNumber("137280968");

		PhoneNumber fax = new PhoneNumber();
		fax.setCode(20);
		fax.setNumber("020221327");
		per.setTel(tel);
		per.setFax(fax);

		// 测试一个标签下有多个同名标签
		List<String> friendList = new ArrayList<String>();
		friendList.add("A1");
		friendList.add("A2");
		friendList.add("A3");
		Friends friend1 = new Friends();
		friend1.setName(friendList);
		per.setFriend(friend1);

		// 测试一个标签下循环对象
		Animal dog = new Animal("doly", 2);
		Animal cat = new Animal("Ketty", 2);
		List<Animal> petList = new ArrayList<Animal>();
		petList.add(dog);
		petList.add(cat);
		Pets pet = new Pets();
		pet.setAnimalList(petList);
		per.setPet(pet);

		XStream xstream = new XStream(new DomDriver("utf-8")); // 指定编码解析器
		xstream.processAnnotations(PersonBean.class);// 如果没有这句，xml中的根元素会是<包.类名>；或者说：注解根本就没生效，所以的元素名就是类的属性
		xstream.aliasSystemAttribute(null, "class");
		String xmlString = xstream.toXML(per);
		System.out.println("xml===" + xmlString);
		return xmlString;
	}

	/**
	 * toBean
	 * 
	 * @Title: toBean
	 * @Description: TODO
	 * @return
	 * @return PersonBean
	 */
	public PersonBean toBean() {
		String xmlStr = "<person>" + "<firstName>chen</firstName>"
				+ "<lastName>youlong</lastName>" + "<telphone>"
				+ "<code>137280</code>" + "<number>137280968</number>"
				+ "</telphone>" + "<faxphone>" + "<code>20</code>"
				+ "<number>020221327</number>" + "</faxphone>" + "<friends>"
				+ "<name>A1</name>" + "<name>A2</name>" + "<name>A3</name>"
				+ "</friends>" + "<pets>" + "<pet>" + "<name>doly</name>"
				+ "<age>2</age>" + "</pet>" + "<pet>" + "<name>Ketty</name>"
				+ "<age>2</age>" + "</pet>" + "</pets>" + "</person>";

		XStream xstream = new XStream(new DomDriver()); // 注意：不是new Xstream();
														// 否则报错：java.lang.NoClassDefFoundError:
														// org/xmlpull/v1/XmlPullParserFactory
		xstream.processAnnotations(PersonBean.class);
		PersonBean person = (PersonBean) xstream.fromXML(xmlStr);
		System.out.println("person=firstname==" + person.getFirstName());
		System.out.println("person==Friends==name1=="
				+ person.getFriend().getName().get(0));
		System.out.println("person==Pets==name=="
				+ person.getPet().getAnimalList().get(1).getName());
		return person;
	}

	/**
	 * 输出xml和解析xml的工具类
	 *
	 * @ClassName:XmlUtil
	 * @author: chenyoulong Email: [email protected]
	 * @date :2012-9-29 上午9:51:28
	 * @Description:TODO
	 */
	public static class XmlUtil {
		/**
		 * java 转换成xml
		 * 
		 * @Title: toXml
		 * @Description: TODO
		 * @param obj
		 *            对象实例
		 * @return String xml字符串
		 */
		public static String toXml(Object obj) {
			XStream xstream = new XStream();
			// XStream xstream=new XStream(new DomDriver()); //直接用jaxp dom来解释
			// XStream xstream=new XStream(new DomDriver("utf-8"));
			// //指定编码解析器,直接用jaxp dom来解释

			// //如果没有这句，xml中的根元素会是<包.类名>；或者说：注解根本就没生效，所以的元素名就是类的属性
			xstream.processAnnotations(obj.getClass()); // 通过注解方式的，一定要有这句话
			return xstream.toXML(obj);
		}

		/**
		 * 将传入xml文本转换成Java对象
		 * 
		 * @Title: toBean
		 * @Description: TODO
		 * @param xmlStr
		 * @param cls
		 *            xml对应的class类
		 * @return T xml对应的class类的实例对象
		 * 
		 *         调用的方法实例：PersonBean person=XmlUtil.toBean(xmlStr,
		 *         PersonBean.class);
		 */
		public static <T> T toBean(String xmlStr, Class<T> cls) {
			// 注意：不是new Xstream(); 否则报错：java.lang.NoClassDefFoundError:
			// org/xmlpull/v1/XmlPullParserFactory
			XStream xstream = new XStream(new DomDriver());
			xstream.processAnnotations(cls);
			T obj = (T) xstream.fromXML(xmlStr);
			return obj;
		}
	}
}