"基于WEB的J2EE信息系统方法研究"

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Abstract: This research paper discusses the methodology behind developing information systems based on J2EE for the web. The study explores the reasons for the establishment of development frameworks in the IT industry and the importance of following best practices in design and development. The paper outlines the concept of a project based Java development framework and its application in IT project development. The research sheds light on the significance of standardizing and streamlining the design and development processes to improve efficiency and effectiveness in creating web-based information systems. Through this study, valuable insights are provided for practitioners and developers in the field of J2EE technology, guiding them towards the successful implementation of web-based information systems.

The development framework provides a good practice for separating the deployment interfaces

(from the service consumer contact) from the service interface (with the business logic of the

application).. The deployment interface in Java is the external representation of the WDSL

interface for services. Classes that implement this interface must represent the class that

implements the service implementation interface. This ensures that all business logic is kept in a

right place. Service interface is a kind of Java interface, representing treasure logic. In most

cases, the deployment interface contains a method subset from the service interface.

Axis 1.2.4 Web Apache service framework is the standard of Web services. To develop Web

services, there are two different methods for first [9]:contract and last contract. The distinction

between first Contract and last WDSL is first created or generated from code. Contract.

When the service consumers or providers of external suppliers, they can use different

techniques to implement a web service (they can use. Net is not Java) [10], the contract first

approach to the development of web service is a good practice.

Four. The integration of the middle layer

Integration with external resources has a variety of technologies, such as database and Web

services. The development framework is called the "integration" layer by the logic layer.. The

goal of this design is: (1) the database access through JDBC or Hibernate must be encapsulated

in the data access object (DAO).. (2) Web services should be as simple as possible. (3) all

external data formats are converted to an application domain object to be limited to this layer. (4)

the simplicity of the application of the test class in this layer unit.

The development framework supports access to the relational database using Hibernate and

direct JDBC calls. Use the template class of the Spring framework: JdbcTemplate and

HibernateTemplate are recommended. When accessing the relational database directly from the

JDBC, the DAOs of the application is proposed to inherit from the Spring framework of the

JdbcDaoSupport. JdbcTemplate class management access database (e.g. PreparedStatement)

resources. The development framework uses the application profile to insert datasource into

DAOs. When using the Hibernate access relational database, the SessionFactory Hiberate is

injected into the application's DAOs by application profile..

Five, the development of life cycl

The focus of the development framework can clearly define the structure of the role and its

interaction in a development team. Three roles are described as follows. The interaction of these

roles is the key to the successful application of the project.. (a) front end developers focus on

JSPs, Action/ActionForm and external Web services. (b) service developers focus on developing

applications and integrating different parts of these services. (c) the integrated document that the

project integrator focuses on mainly to develop, such as DAOs or consumer Web services.

A basic problem in the development is how to develop and integrate code when its

dependencies are not ready or unavailable. Development framework through to declarative

injection simulation object "the structure to solve the problem, and in the process of the

development life cycle with the actual object instead of simulation object. Because our

application is configured by different configuration sets, it becomes possible for this to be. The

framework enables teams to test a component of the development process. This makes it possible

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