The Code for the Business Logic
You will be writing a Web service which will have a String doSomeWork(String work). This method is implemented by the BusinessLogic.java interface and BusinessLogicImpl.java class. The functionality of this method is that it can do whatever you need. Here is the sample interface:
package us.prokhorenko.springaxis;
public interface BusinessLogic {
public String doSomeWork(String work);
}
Here's the code for the class, implementing the interface:
package us.prokhorenko.springaxis;
public class BusinessLogicImpl implements BusinessLogic {
public String doSomeWork(String work) {
String ret;
ret = "The work " + " is done.";
return ret;
}
}
This code is simple and does not require any comments. The business logic can contain any methods you want.
The Code for the Web Service
The Web service requires you to have an interface and an implementation. First comes the interface, WebService.java:
package us.prokhorenko.springaxis.soap;
public interface WebService extends java.rmi.Remote {
public String doSomeWork(String work) throws java.rmi.RemoteException;
}
The interface needs to extend java.rmi.Remote and its method can throw java.rmi.RemoteException exception. The implementation of this interface will look a bit more complex, but I will try to vanish all your fears. So, this is the WebServiceImpl.java class:
package us.prokhorenko.springaxis.soap;
import us.prokhorenko.springaxis.BusinessLogic;
import us.prokhorenko.springaxis.BusinessLogicImpl;
import org.springframework.remoting.jaxrpc.ServletEndpointSupport;
public class WebServiceImpl extends ServletEndpointSupport implements WebService {
private BusinessLogic logic;
protected final void onInit() {
this.logic = (BusinessLogicImpl)getWebApplicationContext()
.getBean("bizLogic");
}
public String doSomeWork(String work)
throws java.rmi.RemoteException {
return logic.doSomeWork(work);
}
}
This implementation is much like the business logic (except the fact that it does not include method itself). This class extends the org.springframework.remoting.jaxrpc.ServletEndpointSupport abstract
class. This is one of the key elements of intergrating of Spring and Axis.
Extending this class provides a reference to the current Spring application
context—like looking up a bean or resource loading.
Using the Spring framework, initialize the BusinessLogic logic variable, to let String doSomeWork(String work) make a call to the method in the business logic, which will do the actual work. Next, define a private variable for logic and leave its initialization to the onInit() method. This is the method that performs callbacks for custom initialization after the context has been set up. bizLogic is the name of the bean, which defines the business logic.
The Spring Configuration
The Spring configuration starts in the web.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app version="2.4">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<servlet>
<servlet-name>springaxis</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springaxis</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
</web-app>
This configures Spring's application context path and sets the mapping of *.html to the springaxis servlet. It will require the springaxis-servlet.xml configuration file, which you'll leave empty for now. The last step is to configure the application context and beans in the applicationContext.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="bizLogic" class="us.prokhorenko.springaxis.BusinessLogicImpl" />
</beans>
Note: The Web service servlet needs to run in the same Web application as the Spring context to allow for access to Spring's facilities.
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