JSP Tutorial in PDF - Learn JSP (Java Server Pages) in simple and easy steps starting from basic to advanced concepts with examples including Java JSP. Java Server Pages (JSP) is a server-side programming technology that JSP have access to the entire family of Java APIs, including the JDBC API to access. Introduction to JSP. JavaServer Pages (JSP) is a technology based on the Java language and enables the development of dynamic web sites. JSP was.
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Learn about Java Server Pages(JSP). JSP is a front end framework used in Java Enterprise applications. This tutorial teaches JSP by progressing from very. JSP: The Complete Reference Part I The Web Programming Environment. 1 The Web Marketplace. Part IV JSP and Other Web Components. Servlet and JSP Programming with IBM WebSphere Studio and VisualAge for Java. May SG International Technical Support Organization.
Subsequent accesses to the this JSP page will be much faster, because they will be re-directed to the translated and compiled servlet directly no JSP-to-servlet translation and servlet compilation needed again , unless the JSP page has been modified. They are: request, response, out, session, application, config, and page. It is often used to retrieve the query parameters in the request message. You can use session's attributes to pass information between pages within this session, via methods getAttribute "name" and setAttribute "name", object.
You can use the application's attributes to pass information between JSP pages and servlets, via methods getAttribute "name" and setAttribute "name", object. Servlet servlet, javax.
ServletRequest request, javax. ServletResponse response, java. In a servlet, you need to use out. Pieces of Java codes written by programmer are embedded into the HTML file to perform the business logic.
The presentation and business logic can be cleanly separated. This example displays a form with checkboxes, and echos your selections.
The default "action" is the current page i. The JSP scriptlet checks if the query parameter "author" exists. For the first request, "author" parameter is absent. Once the user fills in and submits the form, "author" will be present in the HTTP request.
The values are echoed back to the client in an unordered list. The Java expression will be placed inside a out.
Hence, the expression will be evaluated and resultant value printed out as part of the response message. Any valid Java expression can be used. There is no semi-colon at the end of the expression. Date ; out. The Java codes must be syntactically correct, with Java statements terminated by a semi-colon. That is, scriptlets are safe and secure! These information will be written to the response message's header. The default is "true". Setting to "false" could reduce the server's load, if session tracking is not needed in your application.
You can use include directive to include navigation bar, copyright statement, logo, etc.
You can use the taglib directive to tell Tomcat what libraries to load and where they are. A JSP action may contain sub-action. The syntax is as follows. Tomcat clears the output buffer upon executing a forward action. It does not have public variables. It is defined in a named package. It can not be kept in the default no-name package. For a private variable xxx, there is a public getter getXxx or isXxx for boolean and a public setter setXxx.
It implements Serializable interface, so that its state can be stored and retrieved to and from external storage, for persistent. JavaServer PagesTM JSPTM technology provides specification and serving of documents that combine static markup language elements and elements created dynamically by Java programming language objects.
You define how the tag, its attributes, and its body are interpreted, then group your tags into collections called tag libraries that can be used in any number of JSP files.
The ability to define tag libraries in this way permits Java developers to boil down complex server-side behaviors into simple and easy-to-use elements that content developers can easily incorporate into their JSP pages.
Custom tags accomplish some of the same goals as beans that are accessed with jsp:useBean - encapsulating complex behaviors into simple and accessible forms. There are several differences, however. First, beans cannot manipulate JSP content; custom tags can.
Second, complex operations can be reduced to a significantly simpler form with custom tags than with beans. Third, custom tags require quite a bit more work to set up than do beans. Fourth, beans are often defined in one servlet and then used in a different servlet or JSP page whereas custom tags usually define more self-contained behavior.
Finally, custom tags are available only in JSP 1. Visual manipulation tools and other programs can automatically discover information about classes that follow this format and can then create and manipulate the classes without the user having to explicitly write any code. Full coverage of JavaBeans is beyond the scope of this book. The jsp:useBean action lets you load a bean to be used in the JSP page.