【正文】 ④ The easy system is expanded : If need to add the new function to the system , only need to define a new label to finish this function, do not need to do any change to other respects of the system. Can inherit JSP normal characteristics of various fields in the label storehouse. Can expand and increase the function of JSP unrestrictedly like this, and does not need to wait for the appearance of the next edition JSP . Systematic position and realizing： (1) The system making up This system is made up of four parts mainly： The database joins some: This system supports several daily databases , including Oracle, Sybase, MSSQLServer, MySQL and DB2, use JDBC and database to link to each other according to database type and database name , user name , password that users offer that users choose. The basic form of system produces some: After joining with the database , produce the basic form TCTables and TCColumns of two systems according to the user name linking to each other with the database , TCTables form includes English name , Chinese name and some attribute of form belonging to this user in this database , for instance can revise , can inquire about 。t be experts who design webpage either. This can define Web template in JSP page with Javas , in order to set up websites made up of a page with similar appearance. Java pletion data offer, have Java code among template, this mean template these can write by one HTML person is it maintain to e. JSP develops technology as the webpage of the mainstream at present, has the following characteristics： (1) Separate the formulation and showing of the content : Using JSP technology, the page developer of Web can use HTML or XML identification to design and format the final page . Use JSP identification or bound foot turn into dynamic content of page actually (whether content according to is it e change to ask). Produce logic of content of the identification and JavaBeans package , truss up of the little script encapsulation, all scripts run in the end of the server. If key logic among identification and JavaBeans, then other people, such as Web administrative staff and page designer encapsulation, can edit and use JSP page , and does not influence the formulation of the content . (2) Emphasize the reusable package : Most JSP pages depend on the reusable one, the package stepping the platform finish more plicated treatment with required application program. Benefitting from the independence of operating platform of Java, the developer can be very convenient to share and exchange and carry out the ordinary package that operated, or make these packages used by more users. The method based on package has accelerated the total development course, the efficiency of improving the project and developing wholly greatly. Though JSP is powerful, it requires the webpage developer should be quite familiar with Java. There are still relatively few Java programmers now, for general webpage developer, the grammar of JSP is more difficult to grasp . So, need a kind of webpage developing instrument and offer monly used JSP application to general webpage developer, is it understand general page develop developer of technology (HTML ) can use strong function of JSP too only to let. Systematic design object and main technology of use： (1) Design object System this design object for understand but HTML understand general webpage developer of JSP offer a webpage developing instrument at all only, enable them to follow the systematic file, use the daily function of JSP through the label, produce one finally and only include static HTML and dynamic JSP webpage of JSP label. (2) Main technology This system is in the design, consider using the technology of the template and JSP label to realize mainly. Technology of the template The technology of the template is widely applied to various kinds of development and application system. It produces some monly used frame structure in advance , uses the family to choose the template from the template storehouse conveniently according to the needs of one39。s logic are correlated with through using JavaBeans , EJB and Servlet , and only assign the work shown to JSP page to finish. Con