IBM WebSphere 开发者技术期刊: Web 服务中关于继承的考虑

				
        
package com.bat.order;
public class Order {
	protected float total;
	protected float tax;
	protected float net;
	protected Item[] item;
	/* getters & setters omitted */
}
public class Item {
	protected String name;
	protected String description;
	protected String sku;
	protected float price;
	/* getters & setters omitted */
}
public class Labor extends Item {
	protected String skill;
	protected float hours;
	protected float rate;
	/* getters & setters omitted */
}
public class Part extends Item {
	String vehicleCode;
	/* getters & setters omitted */
}
public class Wiper extends Part {
	int length;
	/* getters & setters omitted */
}
public class Carburetor extends Part {
	protected int barrels;
	/* getters & setters omitted */
}
      

				
        
package com.bat.order;
public class OrderService {
	public Order getOrder(int id) {
		Order order = new Order();
		Item[] items = new Item[2];
		order.setItem(items);
		Wiper w = new Wiper();
		w.setDescription("fancy double bladed wiper insert");
		w.setName("XYZ wiper insert");
		w.setPrice(5.67f);
		w.setSku("4320");
		w.setVehicleCode("X43B");
		items[0] = w;
		Labor l = new Labor();
		l.setDescription("install wiper insert");
		l.setHours(0.1f);
		l.setName("ServCo wiper insert installation");
		l.setRate(55.00f);
		l.setSkill("A");
		l.setSku("3451");
		items[1] = l;
		return order;
	}
}
      

				
        
<?xml version="1.0" encoding="UTF-8"?>
   <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 		 			
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance">
      <soapenv:Body>
         <getOrderResponse xmlns="http://order.bat.com">
            <getOrderReturn>
               <net>11.17</net>
               <tax>1.12</tax>
               <total>12.29</total>
               <item>
                  <description>fancy double bladed wiper insert</description>
                  <name>XYZ wiper insert</name>
                  <price>5.67</price>
                  <sku>4320</sku>
               </item>
               <item>
                  <description>install wiper insert</description>
                  <name>ServCo wiper insert installation</name>
                  <price>0.0</price>
                  <sku>3451</sku>
               </item>
            </getOrderReturn>
         </getOrderResponse>
      </soapenv:Body>
   </soapenv:Envelope>
      

				
        
<wsdl:types>
<schema elementFormDefault="qualified" targetNamespace="http://order.bat.com" 
xmlns="http://www.w3.org/2001/XMLSchema" 	
xmlns:impl="http://order.bat.com" 
xmlns:intf="http://order.bat.com" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <element name="getOrder">
    <complexType>
     <sequence>
      <element name="id" type="xsd:int"/>
     </sequence>
    </complexType>
   </element>
   <complexType name="Order">
    <sequence>
     <element name="net" type="xsd:float"/>
     <element name="tax" type="xsd:float"/>
     <element name="total" type="xsd:float"/>
     <element maxOccurs="unbounded" name="item" nillable="true" 
    type="impl:Item"/>
    </sequence>
   </complexType>
   <complexType name="Item">
    <sequence>
     <element name="description" nillable="true" type="xsd:string"/>
     <element name="name" nillable="true" type="xsd:string"/>
     <element name="price" type="xsd:float"/>
     <element name="sku" nillable="true" type="xsd:string"/>
    </sequence>
   </complexType>
   <element name="getOrderResponse">
    <complexType>
     <sequence>
      <element name="getOrderReturn" nillable="true" 
    type="impl:Order"/>
     </sequence>
    </complexType>
   </element>
  </schema>
 </wsdl:types>
      

				
        
   <complexType name="Part">
   	<complexContent>
   	  <extension base="impl:Item">
   	    <sequence>
   		<element name="vehicleCode" type="xsd:string"></element>
          </sequence>
   	  </extension>
   	</complexContent>
   </complexType>
   <complexType name="Labor">
   	<complexContent>
   	  <extension base="impl:Item">
   	    <sequence>
   		<element name="skill" type="xsd:string"></element>
   		<element name="hours" type="xsd:float"></element>
   		<element name="rate" type="xsd:float"></element>
   	    </sequence>
   	  </extension>
   	</complexContent>
   </complexType>
   <complexType name="Wiper">
   	<complexContent>
   	  <extension base="impl:Part">
   	    <sequence>
   		<element name="length" type="xsd:int"></element>
   	    </sequence>
   	  </extension>
   	</complexContent>
   </complexType>
   <complexType name="Carburetor">
   	<complexContent>
   	  <extension base="impl:Part">
   	    <sequence>
   		<element name="barrels" type="xsd:int"></element>
   	    </sequence>
   	  </extension>
   	</complexContent>
   </complexType> 
      

				
        
<?xml version="1.0" encoding="UTF-8"?>
   <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance">
      <soapenv:Body>
         <getOrderResponse xmlns="http://order.bat.com">
            <getOrderReturn>
               <net>11.17</net>
               <tax>1.12</tax>
               <total>12.29</total>
               <ns-11:item 
        xsi:type="ns-11:Wiper" xmlns:ns-11="http://order.bat.com">
                  <ns-11:description>fancy double bladed wiper insert</ns-11:description>
                  <ns-11:name>XYZ wiper insert</ns-11:name>
                  <ns-11:price>5.67</ns-11:price>
                  <ns-11:sku>4320</ns-11:sku>
                  <ns-11:
        vehicleCode>X43B</ns-11:vehicleCode>
                  <ns-11:
        length>0</ns-11:length>
               </ns-11:item>
               <ns-11:item 
        xsi:type="ns-11:Labor" xmlns:ns-11="http://order.bat.com">
                  <ns-11:description>install wiper insert</ns-11:description>
                  <ns-11:name>ServCo wiper insert installation</ns-11:name>
                  <ns-11:price>0.0</ns-11:price>
                  <ns-11:sku>3451</ns-11:sku>
                  <ns-11:
        skill>A</ns-11:skill>
                  <ns-11:
        hours>0.1</ns-11:hours>
                  <ns-11:
        rate>55.0</ns-11:rate>
               </ns-11:item>
            </getOrderReturn>
         </getOrderResponse>
      </soapenv:Body>
   </soapenv:Envelope>
      

				
        
public static void main(String[] args) {
	OrderServiceProxy proxy = new OrderServiceProxy();
	Order order = null;
	try {
		order = proxy.getOrder(1);
	} catch (RemoteException e) {
		e.printStackTrace();
	}	
	Item[] items = order.getItem();
	for (int i=0; i<items.length; i++){
		Class iClass = items[i].getClass();
		if (iClass.getSuperclass().equals(Part.class)) {
			if (iClass.equals(Wiper.class)){
			    System.out.println("item["+i+"]="+"Wiper");
			} else if (iClass.equals(Carburetor.class)) {
			    System.out.println("item["+i+"]="+"Carburetor");
			}
		} else if (iClass.equals(Labor.class)) {
			System.out.println("item["+i+"]="+"Labor");	
		}
	}
}