求大神路过，JAXB怎样处理动态集合啊?
就是当我用JAXB转xml字符串为java对象时，里面包含有集合对象。但是集合对象中的类型又不固定。

我想用java的多态来实现，但是好像JAXB并不能识别。

简单核心代码如下：

Java code

    import java.sql.ResultSet;    import java.sql.SQLException;    import java.util.ArrayList;    import java.util.List;        import org.springframework.jdbc.core.JdbcTemplate;    import org.springframework.jdbc.core.RowMapper;            import com.keer.common.domain.ListBean;    import com.keer.common.domain.Person;        public class Test{                private JdbcTemplate jdbcTemplate;                //这是Test类型        public String getAc01All() {            String sql ="select aac001,aac002,aac003 from ac01";            List<Person> list = jdbcTemplate.query(sql, new RowMapper<Person>(){                public Person mapRow(ResultSet rs, int rowNum) throws SQLException {                    Person p = new Person();                    p.setAac001(rs.getString("aac001"));                    p.setAac002(rs.getString("aac002"));                    p.setAac003(rs.getString("aac003"));                    return p;                }            });            ListBean<Person> lb = new ListBean<Person>();                        String s =list2XML(lb.getClass(),list);                            System.out.println(s);            return s;        }        public String list2XML(Class<?> cla,List<?> list,Class<?> clas){            StringWriter writer = new StringWriter();            ListBean lb =null;            try {                                Object o=cla.newInstance();                if(o instanceof ListBean){                    lb = (ListBean)o;                    lb.setList(list);                }                JAXBContext context = null;                if(null != clas){                    context = JAXBContext.newInstance(cla,clas);                }else{                    context = JAXBContext.newInstance(cla);                }                                marshallXmlType(lb, writer);            } catch (Exception e) {                e.printStackTrace();            }              return writer.toString();        }                        public static <T> void marshallXmlType(T value, Writer os) {              try {                  Class<T> clzz = (Class<T>)value.getClass();                  JAXBContext context = JAXBContext.newInstance(clzz);                Marshaller m = context.createMarshaller();                m.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");                m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);                m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.FALSE);                m.setAdapter(ListAdapter.class,new ListAdapter<Person>());                QName name = new QName(clzz.getSimpleName());                JAXBElement<T> element = new JAXBElement<T>(name, clzz, value);                  m.marshal(element, os);              } catch (JAXBException e) {                  e.printStackTrace();              }        }                public static void main(String[] args) {            System.out.println(new PersonInfo().getAc01All());        }    }    //List模型类        import java.util.List;    import javax.xml.bind.annotation.XmlAttribute;    import javax.xml.bind.annotation.XmlRootElement;    import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;    @XmlRootElement(name = "ListBean")    public class ListBean<T> {                private String name;        private List<T> list;                @XmlJavaTypeAdapter(ListAdapter.class)        public List<T> getList() {            return  list;        }             public void setList(List<T> list) {            this.list = list;        }                @XmlAttribute        public String getName() {            return name;        }             public void setName(String name) {            this.name = name;        }    }    //模型类    import javax.xml.bind.annotation.XmlAccessType;    import javax.xml.bind.annotation.XmlAccessorType;    import javax.xml.bind.annotation.XmlElement;    import javax.xml.bind.annotation.XmlRootElement;    import javax.xml.bind.annotation.XmlType;        @XmlRootElement(name = "Person")    public class Person extends Domain {        @XmlElement(required = true)        protected String aac001;        @XmlElement(required = true)        protected String aac002;        @XmlElement(required = true)        protected String aac003;    }        //xml2集合转换类    import java.util.ArrayList;    import java.util.List;    import javax.xml.bind.annotation.adapters.XmlAdapter;        public class ListAdapter<T extends Domain> extends XmlAdapter<Domain [], List<Domain>> {        public T [] marshal(List<Domain> domains) throws Exception {            Domain [] dos = new Domain[domains.size()];            int i = 0;            for (Domain domain : domains) {                dos[i++] = domain;                System.out.println(domain.getClass().getSimpleName());            }            return (T[]) dos;        }        public List<Domain> unmarshal(Domain [] paramValueType) throws Exception {            List<Domain> list = new ArrayList<Domain>();            for (Domain domain : list) {                list.add(domain);            }            return list;        }    }        //抽象模型类        import java.io.Serializable;    import javax.xml.bind.annotation.XmlRootElement;        @XmlRootElement(name = "Domain")    public class Domain implements Serializable {        private static final long serialVersionUID = -3851152784887793734L;    }     
 

期望输出的xml格式内容为：

XML code

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>    <ListBean>        <Domain>            <aac001>3001415720</aac001>            <aac002>542336197608166802</aac002>            <aac003>巴桑</aac003>        </Domain>        <Domain>            <aac001>3001415721</aac001>            <aac002>542336196407126826</aac002>            <aac003>罗布卓玛</aac003>        </Domain>        <Domain>            <aac001>3001415722</aac001>            <aac002>542336196507030020</aac002>            <aac003>普珍</aac003>        </Domain>    </ListBean>

但是现在代码的输出是这样：

XML code

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>    <ListBean>        <list>            <item/>            <item/>            <item/>        </list>    </ListBean>

[解决办法]
基于你的代码

Java code

import javax.xml.bind.annotation.XmlAttribute;import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement;import java.util.List;@XmlRootElement(name = "ListBean")public class ListBean<T> {    private String name;    private List<T> list;    @XmlElement(name = "Domain")    public List<T> getList() {        return list;    }    public void setList(List<T> list) {        this.list = list;    }    @XmlAttribute    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}