如何通过SimpleXML解析XML

Question

我试图XML使用SimpleXML解析来解析下面的内容.
我曾在不同的方法试图解析Attributes的Element,但无法在解析XML下方获得成功.
它会生成一个列表底部的错误.

<prestashop xmlns:xlink="http://www.w3.org/1999/xlink">
  <order>
    <id>1</id>
    <id_address_delivery xlink:href="http://abc.com/add/1">1</id_address_delivery>
    <id_address_invoice xlink:href="http://abc.com/add/2">2</id_address_invoice>
  </order>
</prestashop>

Order.java

@Root(name="order")
@Namespace(reference="http://www.w3.org/1999/xlink",prefix="xlink")
public class Order {

    @Element(name="id",required=true)
    private int order_id;

    @Element(name="id_address_delivery",required=false)
    private int id_address_delivery;
    @Attribute( name="href", required=false)
    private String id_address_delivery_href;


    @Element(name="id_address_invoice",required=false)
    private int id_address_invoice;
    @Attribute(name="href", required=false)
    private String id_address_invoice_href;
}

OrderObject.java

public class OrderObject
{
    @ElementList(required=true, inline=true)
    private List<Order> list = new ArrayList<Order>();

    public List<Order>getList()
    {
        return this.list;
    }
}

我得到的例外是:

WARN/System.err(988): org.simpleframework.xml.core.PersistenceException: 
Duplicate annotation of name 'href' on field 'id_address_delivery_href' 
private java.lang.String com.prestashop.orders.Order.id_address_delivery_href
at org.simpleframework.xml.core.StructureBuilder.process(StructureBuilder.java:250)
at org.simpleframework.xml.core.StructureBuilder.process(StructureBuilder.java:173)
at org.simpleframework.xml.core.ObjectScanner.field(ObjectScanner.java:438)
at org.simpleframework.xml.core.ObjectScanner.scan(ObjectScanner.java:371)
at org.simpleframework.xml.core.ObjectScanner.<init>(ObjectScanner.java:82)
.
.

Answer 1

这个例外的原因是你的两个@Attribute注释.它们不是设置为下一个元素,而是设置为整个Order对象.您的注释会设置href两次,但值不同.

请参阅JavaDoc @Attribute:

的Attribute注释表示一个XML元素中的序列化的XML属性.[...]

但是有一个很好而且简单的解决方案:不是组合元素和属性,而是创建一个执行此操作的类.

OrderObject 类:

@Root(name = "prestashop")
@Namespace(reference = "http://www.w3.org/1999/xlink", prefix = "xlink")
public class OrderObject
{
    @ElementList(required = true, inline = true)
    private List<Order> list;


    public OrderObject()
    {
        this.list = new ArrayList<>();
    }


    public List<Order> getList()
    {
        return list;
    }


    // ...

    @Override
    public String toString()
    {
        return "OrderObject{" + "list=" + list + '}';
    }

}

注意:toString()这些类中的方法仅用于检查结果!

Order 类:

@Root(name = "order")
public class Order
{
    @Element(name = "id")
    private int id;
    @Element(name = "id_address_delivery")
    private AdressDelivery delivery;
    @Element(name = "id_address_invoice")
    private AdressInvoice invoice;


    public Order(int id, AdressDelivery delivery, AdressInvoice invoice)
    {
        this.id = id;
        this.delivery = delivery;
        this.invoice = invoice;
    }

    private Order() {  }


    // Getter / Setter etc.


    @Override
    public String toString()
    {
        return "Order{" + "id=" + id + ", delivery=" + delivery + ", invoice=" + invoice + '}';
    }


    @Root()
    public static class AdressDelivery
    {
        @Namespace(reference = "http://www.w3.org/1999/xlink", prefix = "xlink")
        @Attribute(name = "href", required = false)
        private String link;
        @Text()
        private int value;


        public AdressDelivery(String link, int value)
        {
            this.link = link;
            this.value = value;
        }

        AdressDelivery() { }



        // Getter / Setter etc.

        @Override
        public String toString()
        {
            return "AdressDelivery{" + "link=" + link + ", value=" + value + '}';
        }
    }

    @Root()
    public static class AdressInvoice
    {
        @Attribute(name = "href", required = false)
        @Namespace(reference = "http://www.w3.org/1999/xlink", prefix = "xlink")
        private String link;
        @Text()
        private int value;


        public AdressInvoice(String link, int value)
        {
            this.link = link;
            this.value = value;
        }

        AdressInvoice() { }


        // Getter / Setter etc.

        @Override
        public String toString()
        {
            return "AdressInvoice{" + "link=" + link + ", value=" + value + '}';
        }
    }

}

您可以看到组合属性和元素的AdressDelivery和AdressInvoice类.您不必将它们实现为内部类; 随意把它们写成"正常"的.你也不必将它们公开,即使是私有也是可能的(例如,在构造函数中构造它们)Order.

但是请注意Order类中没有参数的空构造函数(以及它的内部类).它们是必需的.但是你可以制作所有这些private- 不需要暴露它们.拥有一个没有参数的构造函数是非常重要的.

如何使用(例子):

File f = new File("whatever.xml");

Serializer ser = new Persister();
OrderObject orderObject = ser.read(OrderObject.class, f);

System.out.println(orderObject);

此代码从文件解析Xml并打印反序列化的对象.

输入Xml (如你的问题所示):

<prestashop xmlns:xlink="http://www.w3.org/1999/xlink">
  <order>
    <id>1</id>
    <id_address_delivery xlink:href="http://abc.com/add/1">1</id_address_delivery>
    <id_address_invoice xlink:href="http://abc.com/add/2">2</id_address_invoice>
  </order>
</prestashop>

结果(来自println()):

OrderObject{list=[Order{id=1, delivery=AdressDelivery{link=http://abc.com/add/1, value=1}, invoice=AdressInvoice{link=http://abc.com/add/2, value=2}}]}

没有明确表示,但足以看到结果:-)