JAXB を介した XML とオブジェクト間のマッピングの詳細な紹介

  //1、获取一个基于某个class的JAXBContext，即JAXB上下文
   JAXBContext jaxbContext = JAXBContext.newInstance(obj.getClass());
   //2、利用JAXBContext对象创建对象的Marshaller实例。
   Marshaller marshaller = jaxbContext.createMarshaller();
   //3、设置一些序列化时需要的指定的配置
   marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
    marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
    StringWriter writer = new StringWriter();
    //4、将对象进行序列化
    marshaller.marshal(obj, writer);

@XmlRootElement
public class Person {
 
   private Integer id;
   private String name;
   private Integer age;
   private Address address;
 
   @XmlAttribute(name = "id")
   public Integer getId() {
      returnid;
   }
 
   public void setId(Integer id) {
      this.id = id;
   }
 
   @XmlAttribute
   public String getName() {
      returnname;
   }
 
   public void setName(String name) {
      this.name = name;
   }
 
   @XmlElement
   public Integer getAge() {
      returnage;
   }
 
   public void setAge(Integer age) {
      this.age = age;
   }
 
   @XmlElement
   public Address getAddress() {
      returnaddress;
   }
 
   public void setAddress(Address address) {
      this.address = address;
   }
 
}

@XmlRootElement
public class Address {
 
   private Integer id;
   private String province;
   private String city;
   private String area;
   private String other;
 
   @XmlAttribute(name="id")
   public Integer getId() {
      returnid;
   }
 
   public void setId(Integer id) {
      this.id = id;
   }
 
   @XmlElement
   public String getProvince() {
      returnprovince;
   }
 
   public void setProvince(String province) {
      this.province = province;
   }
 
   @XmlElement
   public String getCity() {
      returncity;
   }
 
   public void setCity(String city) {
      this.city = city;
   }
 
   @XmlElement
   public String getArea() {
      returnarea;
   }
 
   public void setArea(String area) {
      this.area = area;
   }
 
   @XmlElement
   public String getOther() {
      returnother;
   }
 
   public void setOther(String other) {
      this.other = other;
   }
 
}

 @Test
   public void testMarshal() throws JAXBException {
      JAXBContext context = JAXBContext.newInstance(Person.class);
      Marshaller marshaller = context.createMarshaller();
      marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
      StringWriter writer = new StringWriter();
      Person person = new Person();
      person.setId(1);
      person.setName("张三");
      person.setAge(30);
      Address address = new Address();
      address.setId(1);
      address.setProvince("广东省");
      address.setCity("深圳市");
      address.setArea("南山区");
      address.setOther("其它");
      person.setAddress(address);
     
      marshaller.marshal(person, writer);
      System.out.println(writer.toString());
   }

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<person id="1" name="张三">
    <address id="1">
        <area>南山区</area>
        <city>深圳市</city>
        <other>其它</other>
        <province>广东省</province>
    </address>
    <age>30</age>
</person>

//1、创建一个指定class的JAXB上下文对象
   JAXBContext context = JAXBContext.newInstance(Person.class);
   //2、通过JAXBContext对象创建对应的Unmarshaller对象。
   Unmarshaller unmarshaller = context.createUnmarshaller();
   File file = new File("D:\\person.xml");
   //3、调用Unmarshaller对象的unmarshal方法进行反序列化，接收的参数可以是一个InputStream、Reader、File等
   Person person = (Person) unmarshaller.unmarshal(file);

 @Test
   public void testMarshal1() {
      Person person = new Person();
      person.setId(1);
      person.setName("张三");
      person.setAge(30);
      Address address = new Address();
      address.setId(1);
      address.setProvince("广东省");
      address.setCity("深圳市");
      address.setArea("南山区");
      address.setOther("其它");
      person.setAddress(address);
      JAXB.marshal(person, System.out);
   }
 
   @Test
   public void testUnmarshal1() {
      File xml = new File("D:\\person.xml");
      Person person = JAXB.unmarshal(xml, Person.class);
      System.out.println(person);
   }