The Implementation Of EJB Using Method Based On Web Service

Recently, as a type of mature component technology, EJB is widely used in many fields. Because there are some limitations in traditional calling method based on RMI-IIOP and CORBA technology, it's hard to exchange message between EJB and other type of components. Web Service is a method to solve the problem of interoperability between different type of components. Web Service is a effective way to share data and function on Internet, which follows certain technique standards, and bridges the interaction between different type of components and applications.To begin with, the paper summarizes the characteristics of Web Service technology and the framework and developing process of Web Service on J2EE platform. Secondly, after analysed the limitation of RMI-IIOP and CORBA technology, we take use of Web Service technology to improve the EJB calling method.The paper brings forward a model of using EJB through Web service. In the Web Service endpoint of this model, we adopt delegate pattern and EJBHome pattern to mend the way of calling EJB component based on RMI-IIOP and using WSDL document to describe Web Service endpoint. The client can communicate with EJB components through Web Service. The model in this paper wraps the invocation process of EJB using RMI-IIOP and makes EJB components have ability to communicat with other components or applications.