JAXB（二）Map属性映射

 

//JAXB support Collection(List,Set),does not support Map(not Collection).

//XmlAdapter<ValueType,BoundType> : !use List to implement Map's feature,like (List students)!!!

//<ValueType> : to be persisted format, The type that JAXB knows how to handle out of the box

//<BoundType> : memory format, The type that JAXB doesn't know how to handle

public class MapAdapter extends XmlAdapter<MapAdapter.AdaptedMap, Map<String, String>>

 

 

/** * @author timeriver.wang * @date 2013-01-09 8:07:01 PM */@XmlRootElement@XmlAccessorType(XmlAccessType.PROPERTY)public class Student {private String id;private String name;public String getId() {return id;}@XmlElement(name = "id")public void setId(String id) {this.id = id;}@XmlElement(name = "name")public String getName() {return name;}public void setName(String name) {this.name = name;}}

 

/** * @author timeriver.wang * @date 2013-01-09 8:08:15 PM */public class Test {    private static String filePath = "D:/teacher.xml";    public static void main( String[] args )throws Exception {        toXml();        toObj();    }    private static void toXml()throws Exception {        Teacher teacher = initTeacher();        //        JAXBContext jaxbContext = JAXBContext.newInstance( Teacher.class );        // marshal 整理,编列,元帅的意思        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();        // format, make every element keep a separate line.         jaxbMarshaller.setProperty( Marshaller.JAXB_FORMATTED_OUTPUT, true );        //output --> file        File file = new File( filePath );        jaxbMarshaller.marshal( teacher, file );        //output --> console        jaxbMarshaller.marshal( teacher, System.out );    }        private static void toObj()throws Exception {        File file = new File( filePath );        JAXBContext jaxbContext = JAXBContext.newInstance( Teacher.class );        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();        Teacher teacher = (Teacher) jaxbUnmarshaller.unmarshal( file );        System.out.println( teacher.getName() );    }        private static Teacher initTeacher(){     // organize Object(to be saved/persisted)        Teacher teacher = new Teacher();        teacher.setId( "101" );        teacher.setName( "DAO SHI" );        Address address = new Address();        address.setArea( "bei jing, hai dian qu" );        address.setStreet( "shang di 8 jie 88 hao" );        teacher.setAddress( address );        Student stu1 = new Student();        stu1.setId( "007" );        stu1.setName( "ZHOU XING XING" );        Student stu2 = new Student();        stu2.setId( "008" );        stu2.setName( "DA WEN XI" );        List<Student>students = new ArrayList<Student>();        students.add( stu1 );        students.add( stu2 );        teacher.setStudents( students );        Set<String> interests = new HashSet<String>();        interests.add( "play dota" );        interests.add( "smoke" );        teacher.setInterests( interests );        Map<String,String> phones = new HashMap<String,String>();        phones.put( "workPhoe", "18612345678" );        phones.put( "homePhoe", "01012345678" );        teacher.setPhones( phones );        return teacher;    }}

 

/** * @author timeriver.wang * @date 2013-01-09 8:07:09 PM */// @XmlRootElement(namespace ="NAMESPACE" )@XmlRootElement@XmlType(propOrder = {"id","name","address","students","interests","phones"})public class Teacher {    private String id;    private String name;        private Address address;    private List<Student> students;    private Set<String> interests;    private Map<String, String> phones;    @XmlAttribute(name = "tid")    public String getId() {        return id;    }    public void setId( String id ) {        this.id = id;    }    @XmlElement(name = "tname")    public String getName() {        return name;    }    public void setName( String name ) {        this.name = name;    }    @XmlElement(name = "address")    public Address getAddress() {        return address;    }    public void setAddress( Address address ) {        this.address = address;    }    @XmlElementWrapper(name = "students")    @XmlElement(name = "student")    public List<Student> getStudents() {        return students;    }    public void setStudents( List<Student> students ) {        this.students = students;    }    @XmlElementWrapper(name = "interests")    @XmlElement(name = "interest")    public Set<String> getInterests() {        return interests;    }    public void setInterests( Set<String> interests ) {        this.interests = interests;    }//    can not use XmlElementWrapper, because "Map" is not a "Collection"//    @XmlElementWrapper(name = "phones")//    @XmlElement(name = "phone")    //  也可以不加任何注解，JAXB，会提供一个默认的注解    @XmlJavaTypeAdapter(MapAdapter.class)    @XmlElement(name = "phones")    public Map<String, String> getPhones() {        return phones;    }    public void setPhones( Map<String, String> phones ) {        this.phones = phones;    }}

 

//JAXB support Collection(List,Set),does not support Map(not Collection).//XmlAdapter<ValueType,BoundType> : !use List to implement Map's feature,like (List students)!!!//<ValueType> : to be persisted format, The type that JAXB knows how to handle out of the box//<BoundType> : memory format, The type that JAXB doesn't know how to handlepublic class MapAdapter extends XmlAdapter<MapAdapter.AdaptedMap, Map<String, String>> {         public static class AdaptedMap {                 public List<Entry> entry = new ArrayList<Entry>();      }         public static class Entry {                 public String key;                 public String value;       }     @Override    public Map<String, String> unmarshal(AdaptedMap adaptedMap) throws Exception {        Map<String, String> map = new HashMap<String, String>();        for(Entry entry : adaptedMap.entry) {            map.put(entry.key, entry.value);        }        return map;    }     //use List to implement Map's feature,like (List students)!    @Override    public AdaptedMap marshal(Map<String, String> map) throws Exception {        AdaptedMap adaptedMap = new AdaptedMap();        for(Map.Entry<String, String> mapEntry : map.entrySet()) {            Entry entry = new Entry();            entry.key = mapEntry.getKey();            entry.value = mapEntry.getValue();            adaptedMap.entry.add(entry);        }        return adaptedMap;    } }

 

@XmlRootElementpublic class Address {    private String area;        private String street;     @XmlElement(name = "area")    public String getArea() {        return area;    }    public void setArea( String area ) {        this.area = area;    }    @XmlElement(name = "street")    public String getStreet() {        return street;    }     public void setStreet(String street) {        this.street = street;    } }