实体类：

package org.senssic.jaxrs.bean;

import java.util.Date;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class User {
	private String name;
	private int age;
	private Date date;

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	@Override
	public String toString() {

		return "名字：" + name + "年龄：" + age + "时间：" + date;
	}

}

package org.senssic.jaxrs.test;

import java.io.ByteArrayInputStream;
import java.io.InputStream;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;

import org.senssic.jaxrs.bean.User;

public class Test {
	public static void main(String[] args) throws Exception {
		// 实体转化为xml
		// User u = new User();
		// u.setName("aaaaa");
		// u.setAge(20);
		// u.setDate(new Date());
		// JAXBContext jContext = JAXBContext.newInstance(User.class);
		// Marshaller marshaller = jContext.createMarshaller();
		// marshaller.setProperty(Marshaller.JAXB_FRAGMENT,true);
		// marshaller.marshal(u,System.out);

		
		// xml转化为实体
		JAXBContext jContext = JAXBContext.newInstance(User.class);
		Unmarshaller unmarshaller = jContext.createUnmarshaller();
		byte by[] = new String(
				"<user><age>20</age><date>2014-03-20T16:55:29.687+08:00</date><name>aaaaa</name></user>")
				.getBytes();
		InputStream inputStream = new ByteArrayInputStream(by);
		User user = (User) unmarshaller.unmarshal(inputStream);
		System.out.println(user.toString());

	}
}

xml注解实体转换xml时候：

package org.senssic.jaxrs.bean;

import java.util.Date;
import java.util.List;
import java.util.Map;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElements;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlRootElement
public class User {
	// 默认可以不写
	@XmlElement
	private String name;
	@XmlElement(name = "ageaa"/* 节点名称 */,defaultValue = "20"/* 默认值 */,nillable = true/* 可否为零 */,required = true/* 是否必须 */)
	private int age;
	// 为父元素的属性，而不是子节点了
	@XmlAttribute
	private Date date;
	@XmlElements({ @XmlElement(name = "account",type = String.class),@XmlElement(name = "bean",type = Date.class) })
	// list中可以有两种类型，String类和Date类
	private List list;
	// map类型是不可转化类型，需要自定义转换类，比如data类的格式化时间等都需要
	@XmlJavaTypeAdapter(MapAdapter.class)
	private Map<String,Date> map;

	public Map<String,Date> getMap() {
		return map;
	}

	public void setMap(Map<String,Date> map) {
		this.map = map;
	}

	public List getList() {
		return list;
	}

	public void setList(List list) {
		this.list = list;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	@Override
	public String toString() {

		return "名字：" + name + "年龄：" + age + "时间：" + date;
	}

}

package org.senssic.jaxrs.bean;


import java.util.Date;


import javax.xml.bind.annotation.adapters.XmlAdapter;


public class MapAdapter extends XmlAdapter<String,Date> {


	@Override
	public String marshal(Date arg0) throws Exception {


		return new Date().toString();
	}


	@Override
	public Date unmarshal(String arg0) throws Exception {
		Date date = new Date();
		date.setDate(Integer.parseInt(arg0));
		return date;
	}


}

例如：时间格式的转换

XmlJavaTypeAdapter(myDate.class)

package org.senssic.jaxrs.bean;

import java.text.SimpleDateFormat;
import java.util.Date;

import javax.xml.bind.annotation.adapters.XmlAdapter;

public class myDate extends XmlAdapter<String,Date> {

	@Override
	public String marshal(Date v) throws Exception {
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
				"yyyy-MM-dd HH:mm:ss");

		return simpleDateFormat.format(v);
	}

	@Override
	public Date unmarshal(String v) throws Exception {

		return new SimpleDateFormat().parse(v);
	}

}