Implementation of Medicine Sales by Using J2EE Design Patterns

Abstract

Software design patterns describe solutions to specific software design problems. The usefulness of design patterns is simple to write down and catalogue common interactions between objects that programmer have frequently found useful. This system uses eight design patterns, in which Intercepting Filter pattern (log in), View Helper and Composite View patterns (helping to get rich interface), Front Controller pattern (customer, update, shopping cart, browse, payment) and Dispatcher pattern (use in dispatch to another page) are used in the Presentation tier. Transfer Object pattern (transferring data from one tier to another tier), Session Façade pattern (shopping view cart, login) are used in the Business tier to store data just in moment. Data Access Object (DAO) pattern (reduce redundancy coding to connect with database) is used in the Integration tier. The whole system is based on the model-viewcontroller patterns. The design objects are implemented the classes using Java programming language and SQL server.