this tutorial you will find yourself at a moderate level of expertise in using JSP from and graphics published in this e-book are the property of Tutorials Point (I) . 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. JSP Tutorial for Beginners - Learn JSP (Java Server Pages) in simple and easy steps starting from basic to advanced concepts with examples including Java JSP Technology including Overview, Environment PDF Version Tutorials Point.
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Kindly pay an amount of USD before you download this wonderful tutorial in PDF version. We have put lot more effort to bring it to you. DOWNLOAD. JavaServer Pages JSP is a technology for developing web pages that support dynamic . is setup as per environment setup tutorial. . Floating point: as in Java. Servlet and JSP Programming with IBM WebSphere Studio and VisualAge for Java. Installing the Choice for Clearcase as physical single point of control.
A NullPointerException was chosen for this example simply to show the syntax without cluttering the example with extra code As soon as the exception is thrown, it is passed to the processError.
The reason for this becomes obvious when you examine the source code for the generated servlet. NullPointerException ; The first line uses the page directive to indicate that this is an error-handling page and, therefore, the implicit exception object should be made available.
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This page is to tell you what you did wrong. Bear in mind that it is possible to view the processError. The out Object You can send output back to the client by using the out object.
You will notice from Listing that the out variable is of type JspWriter.
This class is a subclass of java. Writer, and provides a set of print methods that enable you to display primitives and String objects.
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The class inherits a set of write methods from its parent class, and in many of the examples in this chapter you see that the generated servlet uses both print and write methods. The print method tends to be used for anything that you embed into the page, whereas the write method is used to output the static text parts of the JSP.
However, if you look at the source code for the JspWriterImpl class that ships with Tomcat, you can see that the print methods are implemented by delegating to the write methods.
You can set the size of the output buffer of a JspWriter by using the page directive and its associated buffer attribute The out object is only really used in practice from within scriptlets. For example, you do not need to use the out object when using expression tags, where you specify an expression that can be converted to a Java String object. The generated code is shown in Listing , which does in fact call the out. There have been several examples in this chapter that use the out object to display data, either directly or within the generated servlet code, so another example is not included at this point.
The page Object This variable corresponds directly to the this reference in the generated servlet.
The page object is not typically used when writing a JavaServer Page. The type of situation where it might be useful is when there is a script on the page that needs to call methods that take a parameter that is a reference to the page itself. The pageContext Object Although each JSP container has its own implementation for the implicit objects and page attributes, there is a uniform way to access them.
Forwarding and redirection of requests is also supported, and is how error handling is internally implemented. You saw this in Listing pageContext.
PageContext class. Table Convenience Methods of the javax. PageContext Class The request Object When a user makes a request of a JSP or servlet , that request is usually modeled by an object that implements the javax.
HttpServletRequest interface. The HttpServletRequest interface inherits from the javax.
The parameter name has the value Mark, and a parameter called age with a value of To make the request take dynamic values, you can use HTML forms with named input fields. We shall explain these codes later. Revisit Java Servlets A typical Java servlet as shown below contains three groups of methods: init , destroy , and one or more service methods such as doGet and doPost.
The service methods takes two arguments: request and response, encapsulating HTTP request and response messages respectively. A PrintWriter object called out is used for writing out the response message to the client over the network. The generated servlet for "first. HttpJspBase implements org. A JspWriter called out, corresponding to servlet's PrintWriter, is allocated to write the response message over the network to the client.
Scriptlets form the program logic. The Java expression is placed inside a out. In other words, the Java expression will be evaluated, and the result of the evaluation written out as part of the response message. 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.
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For the first request, "author" parameter is absent. Destroy the container invokes jspDestroy method. After that, Servlet page is compiled by the compiler and gets converted into the class file. Moreover, all the processes that happen in Servlet are performed on JSP later like initialization, committing response to the browser and destroy.
We have saved this file as index. Put it in a folder and paste the folder in the web-apps directory in apache tomcat to run the JSP page.
We will learn scriptlet tag later.Destroy the container invokes jspDestroy method. This allows the programmers to focus on the business logic, while the web designer to concentrate on the presentation.
JSP is more convenience than servlet for dealing with the presentation, not more powerful. A JSP action may contain sub-action. An alternative would be to check a return value from functions, as in the COM programming style, to determine if a function has executed correctly.
HttpJspBase implements org.