簡(jiǎn)單對(duì)象嵌套

簡(jiǎn)單對(duì)象嵌套

Order對(duì)象中包含Product對(duì)象，這在項(xiàng)目中是常見(jiàn)情形。

    public void test1() throws JAXBException {
        Product p = new Product();
        p.setId("1100");
        p.setName("Apple");

        
        Order order = new Order();
        order.setId("1101");
        order.setPrice(23.45);
        order.setProduct(p);

        
        JAXBContext context = JAXBContext.newInstance(Order.class);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        
        marshaller.marshal(order, System.out);
    }

Order對(duì)象的第三個(gè)屬性是個(gè)復(fù)雜的數(shù)據(jù)類(lèi)型。

@XmlRootElement(name = "Order")
public class Order {


    private String id;
    private Double price;
    private Product product;
    //setters, getters
}

被嵌套的 Product 不需要使用 @XmlRootElement注解，使用注解 @XmlAccessorType是因?yàn)槲蚁矚g將注解標(biāo)注在字段Filed上面。

@XmlAccessorType(XmlAccessType.FIELD)
public class Product {
    @XmlAttribute
    private String id;
    private String name;
    //setters, getters
}

生成的XML含有兩個(gè)層級(jí)。

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Order>
    <id>1101</id>
    <price>23.45</price>
    <product id="1100">
        <name>Apple</name>
    </product>
</Order>