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The skeleton class is the class that sits between the Axis (SOAP) engine and the actual service implementation. The name of this skeleton class is the name of the binding with Skeleton appended at the end.
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TABLE 15.4
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Server-Side Files Generated by WSDL2Java Java Class(es) or Files Created A skeleton class An implementation template class One deploy.wsdd le One undeploy.wsdd le
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WSDL Section For each binding For all services
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The skeleton class generated by the WSDL2Java tool would be similar to the one shown in the Listing 15-14.
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Listing 15-14
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public class AddressBookSOAPBindingSkeleton implements AddressBook org.apache.axis.wsdl.Skeleton { private AddressBook addressBook; public AddressBookSOAPBindingSkeleton () { this.addressBook = new AddressBOOKSOAPBindingImpl (); } public AdressBookSOAPBindingSkeleton (AddressBook impl) this.addressBook = impl; } public void addEntry (String name, Address address ) throws java.rmi.RemoteException { addressBook.addEntry ( name, address); } } {
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This skeleton contains an implementation of the AddressBook service. Either the implementation is passed into the skeleton upon invoking the constructor or an instance of the implementation is created. When the Axis(SOAP) engine calls the skeleton s addEntry method, it simply delegates the invocation to the real implementation s addEntry method.
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Implementation Template
The WSDL2Java tool also generates an implementation template from the binding. This template can be used for the actual implementation. The template looks similar to the one shown in Listing 15-15.
Listing 15-15
public class AddressBookSOAPBindingImpl implements AddressBook { public void addEntry (String name, Address address ) throws java.rmi.RemoteException { } }
The developer will fill out the addEntry method in this template to provide the real implementation of the service operation.
Deployment Descriptors
The WSDL2Java tool also generates deploy.wsdd and undeploy.wsdd files for each service. These files can be used to deploy the service once
Web Services Implementation
the developer has filled in the methods of the implementation class, compiled the code, and made the classes available to the Axis engine. Bottom-Up Approach In this approach, the developer either creates a Java interface (or class) or uses an existing Java class (or interface). Then the developer uses the automated tool, Java2WSDL, to generate a WSDL service description document. Finally, WSDL2Java is used to generate the binding and the artifacts needed on the server side and the client side. We now briefly cover these steps using a simple example of a Java interface that provides two methods for setting and getting the price of a car model. The Java code for this interface is shown in Listing 15-16.
Listing 15-16
package example; public interface CarPrice { public void setCarPrice (String modelName, string price); public String getCarPrice (String modelName); }
The creation of this code for the Java interface constitutes the first step mentioned previously. We store this interface definition in the file CarPrice.java. In the second step, we use the Java2WSDL interface definition file to generate a WSDL file that contains the service description. Listing 15-17 shows the command line use of the tool.
Listing 15-17
%java org.apache.axis.wsdl.Java2WSDL o carprice.wsdl -l http://localhost:8080/services/CarPrice -n "urn:example" p "examples" "urn:example" examples.CarPrice
The various options used in this command line are summarized in Table 15.5.
TABLE 15.5
Explanation of the Options in Listing 15-17
Option -o -l -n -p
Description Speci es the name of the output WSDL le. In this case, we have chosen the name carprice.wsdl. This option describes the location of the service. This option speci es the namespace for the WSDL le. This option de nes the mapping from the Java package name to a namespace. You can specify multiple mappings like the one shown.
Fifteen The Generated Files from Listing 15-18 Description A new interface that extends Java.rmi.remote. The Java le containing the default server implementation of the CarPrice Web Service. The developer will need to modify the *SoapBindingImpl le. A Java le containing the client-side service interface. This le contains client-side service implementation class. This le contains the generated server-side skeleton. This le contains the client-side service stub. The deployment descriptor le for the Web Service. This le contains the descriptor for undeploying the Web Service.
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