JSP made easy with concepts explained in simple terms, example codes with screenshots
JSP prerequisites to learn JSP Knowledge of HTML (especially forms) is essential. Core Java concepts of java.lang and java.util classes (not required networking, multithreading, inner classes and AWT etc.) are essential. Requires practice of Java OOPs programming. A little bit of Servlet knowledge is preferred but not compulsion because sometimes, I compare JSP with Servlets …
What is JSP? What is JSP ? stands for "Java Server Pages" and is a server-side Java Web technology to communicate between a Web client and Web server. It was released to the market in 1999 by Sun Microsystems (now purchased by Oracle Corp.). JSP is most powerful and easy to use technology for Web-site …
JSP Advantages Servlets are difficult to code which are overcome in JSP. Other way, we can say, JSP is almost a replacement of Servlets, (by large, the better word is extension of Servlets), where coding decreases more than half. In Servlets, both static code and dynamic code are put together. In JSP, they are separated. …
To execute a JSP file (known as JSP page), the Web server should be loaded with a software capable to execute JSPs. The software loaded should provide an environment for a JSP to execute. This environment is known as JSP engine or JSP container. Similarly, a Servlet container provides environment for a Servlet to execute. …
1. What is JSP Architecture? Following steps includes the JSP Architecture as shown in the above figure. Web client sends request to Web server for a JSP page (extension .jsp). As per the request, the Web server (here after called as JSP container) loads the page. JSP container converts (or translates) the JSP file into …
Install Tomcat server of your choice version by downloading from Apache site. Many versions of Tomcat can be found in the following link. http://tomcat.apache.org/download-60.cgi Check with the documentation of what JDK or JRE version is compatible to the specific Tomcat version. For example I have loaded Tomcat 5.0 and is compatible with JDK 6.0. While …
Following is your simple JSP Example File Name: Hello.jsp Open in notepad with the file name "Hello.jsp" and type the following your simple program. Every one see, this is my first JSP Program without any JSP tags printing Hello world Output Screenshot of JSP Example Your first JSP Example is over. You may wonder how …
In this first example, client sends user name and password to JSP on the Server. Server receives, validates and sends back the validation result to client as response. JSP User Name Password Login Example Following is the client-side HTML file calling Validation.jsp File Name: UserPass.html Enter User Name Enter Password <form method="get" action="http://localhost:8888/india/Validation.jsp"> In the …
request is an object of HttpServletRequest and is one of the 9 implicit objects, JSP supports. request object is used to retrieve client’s system (like IP address) information, client’s browser (header) information and the data entered by the client in the <form> fields. To retrieve what the client entered in the <form> fields, request object …
One of the advantages of JSP over Servlets is Implicit Objects. Implicit objects make JSP coding simple. In Servlets, the Programmer should create these objects and then use, example, objects of HttpSession, ServletConfig, PrintWriter etc. But in case of JSP, just use them as they are implicitly created and supplied by JSP container. Programmer can …
Infact, I don’t think that there are any implicit methods in JSP but I know there are 9 implicit objects. The methods of these 9 implicit objects and classes readily available for the Programmer, I call them, as JSP implicit methods. I concentrate especially on 4 interfaces because the methods of these interfaces are useful …
Scriptlet is one of the three JSP coding (constructs) elements and the other two being Expression and Declaration. Scriptlet includes maximum dynamic code. It is the processing zone where Programmer writes actual JSP coding. Scriptlet is almost equivalent to the service() method of a Servlet (interms of coding volume and callback). This tutorial focuses on …
Note: It is advised to read Scriptlet tutorial before proceeding this page. The main building blocks of JSP code are Scriptlet, Expression and Declaration. In this tutorial let us see how to and where to use JSP Expression. We know a JSP page contains both static code (written by Web Designer in simple HTML) and …
Note: It is advised to go through Scriptlet and Expression before proceeding this Declaration. We know the three building blocks of JSP code are Scriptlet, Expression and Declaration. Let us focus on JSP Declaration here. JSP Declaration represents the global area of a JSP page where you can write global (instance) variables and methods. These …
Scriptlet, Expression and Declaration are the three building blocks of JSP code. Let us see the appropriate places when to use them and finally we will do one example where all the three are used. Note: It is advised to go through the separate examples on Scriptlets, expressions and declarations before going through this. Here, …
Note: It is advised to go through "JSP Scriptlet, Expression and Declaration – all in one example" to know their scope and usage in JSP coding before proceeding this topic. We know earlier, JSP Declaration represents a global area for the whole JSP file where programmer can declare variables and methods that can be used …
In the example, client sends user name to login (no password for simplicity). Server validates and sends back result of validation. If user name is successful, sends message "Login is Success" and fails sends a new login form to client to enter a new user name and repeat the process until login is successful. To …
JSP file web.xml alias name Giving alias name for a JSP file is optional. So far, we have executed all JSPs without alias name by writting the JSP file name in the action attribute of <form> tag. In this code, let us give alias name to JSP file and call it from action attribute. I …
Mapping JSP file in web.xml file with alias name Read More »
After learning Scriptlets, Expressions, Declarations and our own methods – all in one example, it is the time to learn about comments used in JSP. We know JSP code contains static HTML code and dynamic JSP code. There are two types of of comments supporting static HTML and one type of comment supporting dynamic JSP …
"out" is one of the 9 implicit objects, Java supports. It represents an object of javax.servlet.jsp.JspWriter, a subclass of character stream java.io.Writer. Any data given to implicit object out JSP goes as output stream which is sent to client as response. That is, Programmer uses out object to send data to client. It is equivalent …
