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Web Services Implementation
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public void setAreaCode ( int areaCode) { this.areaCode=areaCode; } public java.lang.String getExchange () { return exchange; } public void setExchange ( java.lang.String exchange) { this.exchange=exchange; } public java.lang.String getNumber () { return number; } public void setNumber ( java.lang.String number ) { this.number = number ; } public boolean equals (Object obj) { ..} public int hashCode () { .. } }
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The first thing to notice in the generated code is that the class name is Phone, whereas the XML name was phone. Therefore, the tool has capitalized the first letter of the name to match the Java convention that class names begin with an uppercase letter. The second thing to notice from the generated code that corresponds to the three elements of the complexType in XML, is that the bean has three properties. The types of these elements are mapped according to Table 15.2. All three properties of the bean have getter and setter methods. Finally, notice that this bean implements the java.io.serializable interface so that the bean can be transported over the network. In addition to this bean, the tool also generates a holder class from the types section of the WSDL file, as shown in Listing 15-4. This holder class is typically used as an inout or out parameter. This is because Java does not have the concept of inout/out parameters. In order to achieve this behavior, JAX-RPC specifies the use of the holder class. (A holder class is simply a class that contains an instance of its type.) The holder for the Phone class is shown in Listing 15-4.
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Listing 15-4
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Public final class PhoneHolder implements javax.xml.rpc. holders.Holder { public Phone value; public PhoneHolder () { } public PhoneHolder () { } public PhoneHolder ( Phone value) { this.value = value; } }
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A holder class is generated for a type if that type is used as an inout or out parameter. Note that the holder class has the suffix Holder appended to its name.
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The portTypes Section
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Next, we consider the tool-generated Java code that corresponds to the portType section of the WSDL service definition file. In this case, the tool generates a Java interface called Service Definition Interface (SDI) for each portType. For example, given the WSDL shown in Listing 15-5, the WSDL2Java tool will generate the Java code in Listing 15-6.
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Listing 15-5
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<message name="empty"/> <message name="AddEntryRequest"> <part name="name" type="xsd:string"/> <part name="address" type=types"address"/> </message> <portType name="AddressBook"> <operation name="addEntry"> <input message="tns:AddEntryRequest"/> <output message="tns:empty"/> </operation> </portType>
Listing 15-6
public interface AddressBook extends java.rmi.Remote { public void addEntry (String name, Address address) java.rmi.RemoteException; } throws
It is important to note that although the name of the SDI is typically the name of the portType, the WSDL2Java tool needs information from both the portType and the binding portion of the WSDL file. This feature adds some complexity, the discussion of which is beyond the scope of this chapter.
The binding Section
The WSDL2Java tool generates a stub class for each binding. This stub s name is the binding name with the suffix Stub appended. This stub class implements the SDI generated in the last subsection. The stub class contains the Java code that turns the method invocations into SOAP calls using the Axis Service and Call objects. The stub class stands in as a proxy for the remote service, allowing you to call the service as if it were a local object. In other words, you do not need to deal with the end point URL, namespace, or parameter arrays involved in the dynamic invocation via the Service and Call objects. Listing 15-7 shows the binding section of a WSDL document.
Web Services Implementation
Listing 15-7
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