Tutorial is a guide to developing enterprise applications for the Java 2 Platform, Enterprise Edition (J2EE) version Here we cover all the things you need. J2EE was proposed by Sun Microsystems (Now, Oracle) for developing and deploying multitier, distributed, enterprise scale business. J2EE, J2SE, JavaMail, Java Naming and Directory Interface, EJB, and JSP .. similar to The Java™ Tutorial, and in fact The Java™ Tutorial probably still has.
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Java Servlet is the foundation technology for Java server-side programming.
In brief, HTTP is a request-response protocol. The client java j2ee tutorial a request message to the server. The server, in turn, returns a response message. The messages consists of two parts: Header provides information about the messages.
The data in header is organized in name-value pairs. First "Hello-world" Servlet Let us begin by writing a servlet that says java j2ee tutorial in response to a client's request.
Java j2ee tutorial a new Webapp "helloservlet" We shall begin by defining a new webapp web application called "helloservlet" in Tomcat. A Java webapp has a standardized directory structure for storing various types of resources.
Create a directory "helloservlet" under Java j2ee tutorial "webapps" directory i. Take note that the directory names are case-sensitive. The resources must be kept in the respective directories: This directory is known as context root for the web context "helloservlet".
Basic Introduction to Java 2 Enterprise Edition ( J2EE )
These resources will be delivered to the clients as it is. You java j2ee tutorial create sub-directories such as images, css and scripts, to further categories the resources.
This directory is NOT accessible by the clients directly.
This is where you keep your application-specific configuration files such as "web. Keep the Java program source files.
It is java j2ee tutorial good practice to separate the source files and classes to facilitate deployment. Keep the Java classes compiled from the source codes. Classes defined in packages must be kept according to the package directory structure.
This directory is also NOT accessible by the clients. It keeps resources and configurations e. In this example, we shall write a servlet called "HelloServlet. A client can invoke "HelloServlet. A servlet shall be kept inside a Java j2ee tutorial package instead of the default no-name package for proper deployment.
Developing a Java EE Application - Help | IntelliJ IDEA
Let's call our package "mypkg". Use a programming text editor to enter the following source codes, and save as "HelloServlet.
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We define a Java class called HelloServlet in Line 8. Line 2 places this class in a package called mypkg.
Java Web Developer Tutorial - J2EE Programming Concept - J2EE Online Training
We need the Servlet API library to compile this program. Tomcat provides a copy of servlet API called "servlet-api.
You could copy "servlet-api.