使用JAXB实现JAVA对象和XML字符串的互相转换实例

测试类：

package com.yanek.test;



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

import com.yanek.test.JaxbUtil.CollectionWrapper;


public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		//创建java对象
		
		Hotel hotel=new Hotel();
		hotel.setId(1);
		hotel.setName("name1");

		RoomTypeVO t1=new RoomTypeVO();
		t1.setPrice("20");
		t1.setTypeid(1);
		t1.setTypename("typename1");
		
		RoomTypeVO t2=new RoomTypeVO();
		t2.setPrice("30");
		t2.setTypeid(2);
		t2.setTypename("typename2");
		

		List<RoomTypeVO> RoomTypeVOs=new ArrayList<RoomTypeVO>();
		RoomTypeVOs.add(t1);
		RoomTypeVOs.add(t2);
		hotel.setRoomTypeVOs(RoomTypeVOs);

		
		//将java对象转换为XML字符串
		JaxbUtil requestBinder = new JaxbUtil(Hotel.class,
				CollectionWrapper.class);
		String retXml = requestBinder.toXml(hotel, "utf-8");
		System.out.println("xml:"+retXml);
		
		//将xml字符串转换为java对象
		JaxbUtil resultBinder = new JaxbUtil(Hotel.class,
				CollectionWrapper.class);
		Hotel hotelObj = resultBinder.fromXml(retXml);
		
		
		
		System.out.println("hotelid:"+hotelObj.getId());
		System.out.println("hotelname:"+hotelObj.getName());
		for(RoomTypeVO roomTypeVO:hotelObj.getRoomTypeVOs())
		{
			System.out.println("Typeid:"+roomTypeVO.getTypeid());
			System.out.println("Typename:"+roomTypeVO.getTypename());
		}

		
	}

}

输出如下：

xml:<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<hotel id="1">
    <name>name1</name>
    <RoomTypeVOs>
        <RoomTypeVO typeid="1">
            <price>20</price>
            <typename>typename1</typename>
        </RoomTypeVO>
        <RoomTypeVO typeid="2">
            <price>30</price>
            <typename>typename2</typename>
        </RoomTypeVO>
    </RoomTypeVOs>
</hotel>


hotelid:1
hotelname:name1
Typeid:1
Typename:typename1
Typeid:2
Typename:typename2

相关类：

package com.yanek.test;



import java.util.List;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "hotel")
public class Hotel {
	@XmlElementWrapper(name = "RoomTypeVOs")
	@XmlElement(name = "RoomTypeVO")
	public List<RoomTypeVO> getRoomTypeVOs() {
		return RoomTypeVOs;
	}
	public void setRoomTypeVOs(List<RoomTypeVO> roomTypeVOs) {
		RoomTypeVOs = roomTypeVOs;
	}
	private List<RoomTypeVO> RoomTypeVOs;
	
	/////@XmlElement(name = "id")
	@XmlAttribute(name = "id")
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	@XmlElement(name = "name")
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	private int id;
	private String name;
	

}



package com.yanek.test;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;

public class RoomTypeVO {
	
	///@XmlElement(name = "typeid")
	@XmlAttribute(name = "typeid")
	public int getTypeid() {
		return typeid;
	}
	public void setTypeid(int typeid) {
		this.typeid = typeid;
	}
	@XmlElement(name = "typename")
	public String getTypename() {
		return typename;
	}
	public void setTypename(String typename) {
		this.typename = typename;
	}
	@XmlElement(name = "price")
	public String getPrice() {
		return price;
	}
	public void setPrice(String price) {
		this.price = price;
	}
	private int typeid;
	private String typename;
	private String price;

}

jaxb简单工具类：

package com.yanek.test;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.Collection;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.namespace.QName;

import org.apache.commons.lang.StringUtils;

/**
 * 使用Jaxb2.0实现XML<->Java Object的Binder.
 * 
 * 特别支持Root对象是List的情形.
 * 
 * @author
 */
public class JaxbUtil {
	// 多线程安全的Context.
	private JAXBContext jaxbContext;

	/**
	 * @param types
	 *            所有需要序列化的Root对象的类型.
	 */
	public JaxbUtil(Class<?>... types) {
		try {
			jaxbContext = JAXBContext.newInstance(types);
		} catch (JAXBException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * Java Object->Xml.
	 */
	public String toXml(Object root, String encoding) {
		try {
			StringWriter writer = new StringWriter();
			createMarshaller(encoding).marshal(root, writer);
			return writer.toString();
		} catch (JAXBException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * Java Object->Xml, 特别支持对Root Element是Collection的情形.
	 */
	@SuppressWarnings("unchecked")
	public String toXml(Collection root, String rootName, String encoding) {
		try {
			CollectionWrapper wrapper = new CollectionWrapper();
			wrapper.collection = root;

			JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(
					new QName(rootName), CollectionWrapper.class, wrapper);

			StringWriter writer = new StringWriter();
			createMarshaller(encoding).marshal(wrapperElement, writer);

			return writer.toString();
		} catch (JAXBException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * Xml->Java Object.
	 */
	@SuppressWarnings("unchecked")
	public <T> T fromXml(String xml) {
		try {
			StringReader reader = new StringReader(xml);
			return (T) createUnmarshaller().unmarshal(reader);
		} catch (JAXBException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * Xml->Java Object, 支持大小写敏感或不敏感.
	 */
	@SuppressWarnings("unchecked")
	public <T> T fromXml(String xml, boolean caseSensitive) {
		try {
			String fromXml = xml;
			if (!caseSensitive)
				fromXml = xml.toLowerCase();
			StringReader reader = new StringReader(fromXml);
			return (T) createUnmarshaller().unmarshal(reader);
		} catch (JAXBException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * 创建Marshaller, 设定encoding(可为Null).
	 */
	public Marshaller createMarshaller(String encoding) {
		try {
			Marshaller marshaller = jaxbContext.createMarshaller();

			marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

			if (StringUtils.isNotBlank(encoding)) {
				marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);
			}
			return marshaller;
		} catch (JAXBException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * 创建UnMarshaller.
	 */
	public Unmarshaller createUnmarshaller() {
		try {
			return jaxbContext.createUnmarshaller();
		} catch (JAXBException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * 封装Root Element 是 Collection的情况.
	 */
	public static class CollectionWrapper {
		@SuppressWarnings("unchecked")
		@XmlAnyElement
		protected Collection collection;
	}
}