Research And Implementation Of The Library Of Java Card

The Java Card technology formulates a specific of the Smart Card Platform with security, convenience and multi-function, which has become the mainstream trend of development about Java Card. At present Java Card is undergoing tremendous changes, and has converted from single equipment to a platform with complexity and multi-application environment, which provides so many uses, including electronic wallet, identity verification and data protection etc. Now Java Card has been widely used in financial services, public utilities, health, social insurance, business taxation, telecommunications and transport management.The Java Card technology mainly consists of three parts: Java Card API, Java Card Runtime Environment and Java Card Virtual Machine. And, Java Card API provides a stand interface for the development of Applet, reduces the development complexity of application, simplifies the development process and really realizes the conception "a preparation, running everywhere" which was declared by Java designers.At first ,it is presented the research settings,general situations and development of Java Card, analyzed the parsing flow of the interpreter to the call of the method of other package, and proposed the scheme of Java Card API with the design of the interpreter.Besides, according to Java Card API 2.2.2, this paper realizes the module of transaction mechanism, the module of transient object and the module of security with limited resources in smart card.At last, this paper extends Java Card API and realizes SMS4.