使用JAXB实现JAVA对象和XML字符串的互相转换

 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 RoomTypeVOs=new ArrayList();
         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());
         }


     }
    
     实体类：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 getRoomTypeVOs() {
         return RoomTypeVOs;
     }
     public void setRoomTypeVOs(List roomTypeVOs) {
         RoomTypeVOs = roomTypeVOs;
     }
     private List 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;


 }




 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：

 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 wrapperElement = new JAXBElement(
                     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 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 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;
     }
 }




  
      输出如下：
 xml:
 xml version="1.0" encoding="utf-8" standalone="yes"?>
 <hotel id="1">
     <name>name1name>
     <RoomTypeVOs>
         <RoomTypeVO typeid="1">
             <price>20price>
             <typename>typename1typename>
         RoomTypeVO>
         <RoomTypeVO typeid="2">
             <price>30price>
             <typename>typename2typename>
         RoomTypeVO>
     RoomTypeVOs>
 hotel>


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