JavaBeat » WebService

EJB Webservices in JBoss application server sample code

JavaBeat — Thu, 25 Sep 2008 00:52:37 +0000

Employee Service.java
----------------------
package com.crm.services;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import com.crm.bean.Employee;
/**
* @author AnilKumar
*
*/
@WebService
@SOAPBinding(style = SOAPBinding.Style.RPC)
public interface EmployeeService {
public Employee getEmployee(long pin);
}
 
EmployeeServiceImpl.java
-------------------------
package com.crm.services;
 
import javax.ejb.Stateless;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
 
import com.crm.bean.Employee;
import com.crm.model.EmployeeDAO;
import com.crm.modelinterface.cmsEmployee;
/**
* @author AnilKumar
*
*/
@Stateless
@WebService(endpointInterface = "com.crm.services.EmployeeService")
@SOAPBinding(style = SOAPBinding.Style.RPC)
public class EmployeeServiceImpl {
 
@WebMethod(operationName = "getEmployee")
public Employee getEmployee(@WebParam(name = "pin")
long pin) {
cmsEmployee employee2 = new EmployeeDAO();
// Employee employee2 = employeeDAO.getEmployeebyemployee(pin);
 
Employee employee = employee2.getEmployeebyemployee(pin);
 
System.out.println(employee.getFirstname());
return employee;
}
 
}

deploy above two classes by archieving in a jar and copy it to deploy folder of jboss
then run ur jboss server with url http://localhost:8080/jbossws there u will get all ur
web services running in your server. the client program will be like this

package com.crm.serviceClient;
 
import java.net.MalformedURLException;
import java.net.URL;
 
import javax.xml.namespace.QName;
import javax.xml.ws.Service;
import javax.xml.ws.WebEndpoint;
import javax.xml.ws.WebServiceClient;
 
import com.crm.bean.Employee;
import com.crm.services.EmployeeService;
/**
* @author AnilKumar
*
*/
@WebServiceClient(name = "EmployeeServiceImplService", targetNamespace = "http://services.crm.com/",
wsdlLocation = "http://localhost:8080/jarfilename/EmployeeServiceImpl?wsdl")
public class EmployeeServiceClient extends Service {
protected EmployeeServiceClient(URL wsdlDocumentLocation,
QName serviceName) {
super(wsdlDocumentLocation, serviceName);
// TODO Auto-generated constructor stub
}
 
public EmployeeServiceClient() throws MalformedURLException {
super(new URL(
"http://localhost:8080/jarfilename/EmployeeServiceImpl?wsdl"),
new QName("http://services.crm.com/",
"EmployeeServiceImplService"));
}
 
@WebEndpoint
public EmployeeService getEmployeeServiceport() {
return (EmployeeService) super.getPort(new QName(
"http://services.crm.com/", "EmployeeServiceImplPort"),
EmployeeService.class);
 
}
 
public static void main(String[] args) throws MalformedURLException {
 
try {
EmployeeService service = new EmployeeServiceClient().getEmployeeServiceport();
 
if (service != null) {
System.out.println("Serrvice not null");
Employee employee1 = service.getEmployee(18);
 
System.out.println(employee1.getFirstname());
System.out.println(employee1.getLastname());
}
 
} catch (Exception e) {
e.printStackTrace();
}
 
}
 
}

Benefits of using Web Services

JavaBeat — Fri, 19 Sep 2008 13:03:48 +0000

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Benefits of using Web Services

Exposing the function on to network: A Web service is a unit of managed code that can be remotely invoked using HTTP, that is, it can be activated using HTTP requests. So, Web Services allows you to expose the functionality of your existing code over the network. Once it is exposed on the network, other application can use the functionality of your program.

Connecting Different Applications: Web Services allows different applications to talk to each other and share data and services among themselves. Other applications can also use the services of the web services. For example VB or .NET application can talk to java web services and vice versa. So, Web services is used to make the application platform and technology independent.

Standardized Protocol: Web Services uses standardized industry standard protocol for the communication. All the four layers (Service Transport, XML Messaging, Service Description and Service Discovery layers) uses the well defined protocol in the Web Services protocol stack. This standardization of protocol stack gives the business many advantages like wide range of choices, reduction in the cost due to competition and increase in the quality.

Low Cost of communication: Web Services uses SOAP over HTTP protocol for the communication, so you can use your existing low cost internet for implementing Web Services. This solution is much less costly compared to proprietary solutions like EDI/B2B.

Support for Other communication means: Beside SOAP over HTTP, Web Services can also be implemented on other reliable transport mechanisms. So, it gives flexibility use the communication means of your requirement and choice. For example Web Services can also be implemented using ftp protocol (Web services over FTP).

Loosely Coupled Applications: Web Services are self-describing software modules which encapsulates discrete functionality. Web Services are accessible via standard Internet communication protocols like XML and SOAP. These Web Services can be developed in any technologies (like c++, Java, .NET, PHP, Perl etc.) and any application or Web Services can access these services. So, the Web Services are loosely coupled application and can be used by applications developed in any technologies. For example, I have heard of people developing Web Services using Java technologies and using the Web Services in VB or .NET applications.

Web Services Sharing: These days due to complexness of the business, organizations are using different technologies like EAI, EDI, B2B, Portals etc. for distributing computing. Web Services supports all these technologies, thus helping the business to use existing investments in other technologies.

Web Services are Self Describing: Web Services are self describing applications, which reduces the software development time. This helps the other business partners to quickly develop application and start doing business. This helps business to save time and money by cutting development time.

Automatic Discovery: Web Services automatic discovery mechanism helps the business to easy find the Service Providers. This also helps your customer to find your services easily. With the help of Web Services your business can also increase revenue by exposing their own Web Services available to others.

Business Opportunity: Web Services has opened the door to new business opportunities by making it easy to connect with partners.

What is SOA?

JavaBeat — Fri, 19 Sep 2008 13:03:06 +0000

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SOA

Service Oriented Architecture or SOA for short is a new architecture for the development of loosely coupled distributed applications. In fact service-oriented architecture is collection of many services in the network. These services communicate with each other and the communications involves data exchange & even service coordination. Earlier SOA was based on the DCOM or Object Request Brokers (ORBs). Nowadays SOA is based on the Web Services.

Broadly SOA can be classified into two terms: Services and Connections.

Services

A service is a function or some processing logic or business processing that is well-defined, self-contained, and does not depend on the context or state of other services. Example of Services are Loan Processing Services, which can be self-contained unit for process the Loan Applications. Other example may be Weather Services, which can be used to get the weather information. Any application on the network can use the service of the Weather Service to get the weather information.

Connections

Connections means the link connecting these self-contained distributed services with each other, it enable client to Services communications. In case of Web services SOAP over HTTP is used to communicate the between services.

The following figure is a typical example of the service-oriented architecture. It shows how a service consumer sends a service request to a service provider. After accepting the request, service provider send a message to the service consumer. In this case a service provider can also be a service consumer.

Different Technologies Used

SOA is much different from point-to-point architectures. SOA comprise loosely coupled, highly interoperable application services. These services can be developed in different development technologies (such as Java, .NET, C++, PERL, PHP), the software components become very reusable i.e. the same C# (C Sharp) service may be used by a Java application and / or any other programming language. WSDL defines an standard, which encapsulates / hides the vendor / language specific implementation from the calling client / service.