A HISTORICAL REVIEW ABOUT JAVA WEB APPLICATION DEVELOPMENT – Develop Java Web Applications to Access Databases

8.1   A HISTORICAL REVIEW ABOUT JAVA WEB APPLICATION DEVELOPMENT Java Web applications are based on the Servlet technique, and the Servlet works as a Web server that provides all support, such as receiving requests from the client and sending responses back to the client. That is, a Servlet is a server class built in the … Read moreA HISTORICAL REVIEW ABOUT JAVA WEB APPLICATION DEVELOPMENT – Develop Java Web Applications to Access Databases

Using JavaServer Pages Technology for Java Web Applications 2 – Develop Java Web Applications to Access Databases

In fact, JavaServer Pages can handle more complicated jobs, such as business logic, JDBC-related database connections, data processing and JSP switching. Generally, a main or controller JSP takes charge of passing parameters between the server and clients, forwarding the user to the other target JSP or Web pages based on the run result of the … Read moreUsing JavaServer Pages Technology for Java Web Applications 2 – Develop Java Web Applications to Access Databases

Using JavaServer Pages Technology for Java Web Applications – Develop Java Web Applications to Access Databases

8.1.2   Using JavaServer Pages Technology for Java Web Applications In fact, the JavaServer Pages technique provides a way of using Java code within an HTML page, which means that you can embed a piece of Java code or part of Servlet’s functions into the code on the client side with appropriate tags. The embedded Java … Read moreUsing JavaServer Pages Technology for Java Web Applications – Develop Java Web Applications to Access Databases

Using Java Help Class Files for Java Web Applications 3 – Develop Java Web Applications to Access Databases

Now let’s build our LogInQuery.jsp page, which works as a part of the server, to receive and handle the Form data, including the login information sent by the index.jsp page. Figure 8.9 shows the code for this page. Let’s have a closer look at this piece of code to see how it works. A. A … Read moreUsing Java Help Class Files for Java Web Applications 3 – Develop Java Web Applications to Access Databases

Using Java Help Class Files for Java Web Applications 2 – Develop Java Web Applications to Access Databases

I. The executeQuery() method is executed to perform the query, and the returned result is assigned to the ResultSet object rs.J. A while loop is used to pick up any possible matching username and password. In fact, only one row is returned, and thus this loop can run only one time. The getString() method is … Read moreUsing Java Help Class Files for Java Web Applications 2 – Develop Java Web Applications to Access Databases

Using Java Help Class Files for Java Web Applications – Develop Java Web Applications to Access Databases

8.1.3  Using Java Help Class Files for Java Web Applications To distinguish between database-related data processing and display of run results, we can separate a Java Web application into two parts: JDBC-related database processing and business logic, such as checking and confirming a username and password pair located in a Java help class file, and … Read moreUsing Java Help Class Files for Java Web Applications – Develop Java Web Applications to Access Databases

Using the JSP Implicit Object Session for Java Web Applications – Develop Java Web Applications to Access Databases

8.1.4   Using the JSP Implicit Object Session for Java Web Applications As we mentioned in Section 8.1.2, the session is a JSP implicit object used to help developers build professional Java Web applications. “Implicit” means that those objects, including the session object, can be created automatically when a new JSP is executed. The specific property … Read moreUsing the JSP Implicit Object Session for Java Web Applications – Develop Java Web Applications to Access Databases

Build the Transaction JSP File, FacultyQuery.jsp – Develop Java Web Applications to Access Databases

8.1.4.2  Build the Transaction JSP File, FacultyQuery.jspThe purpose of this file is to transfer data and information between our main display page,FacultyPage.jsp, and our working help class file, FacultyBean, which performs all JDBC- and database-related operations and business logic. The code for this file is shown in Figure 8.14. Let’s take a closer look at … Read moreBuild the Transaction JSP File, FacultyQuery.jsp – Develop Java Web Applications to Access Databases

Build the Help Class FacultyBean 2 – Develop Java Web Applications to Access Databases

The operational sequence and data transformation structure of the Faculty Name are shown in Figure 8.16, where the faculty name is used as an example to illustrate how to transfer data between the client and the help class. The operational sequence is: 1) First the desired faculty name is entered by the user into the … Read moreBuild the Help Class FacultyBean 2 – Develop Java Web Applications to Access Databases

Build the Help Class FacultyBean – Develop Java Web Applications to Access Databases

8.1.4.3   Build the Help Class FacultyBean This class is a help class but is very similar to a real Java bean class. The code for this class is shown in Figure 8.15. FIGURE 8.15   The code for the FacultyBean help class. Let’s have a closer look at this piece of code to see how it … Read moreBuild the Help Class FacultyBean – Develop Java Web Applications to Access Databases



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