The Application Of Design Patterns In J2ee Projects

Coordinated all the logistics business today is highly concerned by many enterprises to enhance the competition. Now the rapid development of the logistics industry, the demand for information systems is volatile. So the development and maintenance of the Logistics Information System brings a tremendous challenge. The author of this article involved in the process of development logistical system from the design, coding to testing. For design pattern's exploration, the author raised one idea ,that is design should be done based on business and team conditions to find a reasonable solution not only from technical dimension. Author's concrete work included following area: The Author choose Struts from many MVC model as a basic framework of the project. Design pattern for presentation layer's improvements .The author used template design pattern for common certification. For special business certification author use Tag and Dispatch technology. Author used Java Applet and buffer design pattern to improve performance. Design pattern for business layer's improvements. The author used Cglib and proxy design pattern to solve business code and log function code's coupling problem. Transaction management using JDBC and template design pattern to reduce the combination of the code coupling. Pessimistic concurrency control design pattern used in the enterprise model, reducing the chances of conflict. Velocity and construction pattern used in JavaMail to do a variety of formats mail sent. Visitors pattern used in Error-handling model to make wrong handling very easily. Design Patterns for Persistence layer's improvements. JDBC, DbUtils and template patterns's combination to reduce the code coupling. For automatic test, The author used factory design pattern and state tagged technology to solve switching status in real operation and testing operations .In the conclusion part of this paper ,the author focused on the system design should...