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Multimedia and Advance Web Technologies

By:

Dr. Mohammad Shoab

Week 7, 8 & 9

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Java platform

A Java platform comprises the JVM together with supporting class libraries.

Java 2 Standard Edition (J2SE)

(1999) provides core libraries for data structures, xml parsing, security, internationalization, db connectivity, RMI

Java 2 Platform, Enterprise Edition (J2EE)

provides more class libraries for servlets, JSPs, Enterprise Java Beans, advanced XML

Java Platform, Enterprise Edition (Java EE)

When Java Platform 5.0 was released (2004) the ‘2’ was dropped from these titles.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Java platform

Java Micro Edition (Java ME)

comprises the necessary core libraries and tools for writing Java for embedded systems and other small footprint platforms, along with some specialised libraries for specific types of device such as mobile phones.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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What is a

Java Web application?

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Java Web Application

A Java web application generates interactive web pages containing various types of markup language (HTML, XML, and so on) and dynamic content.

It is typically comprised of web components such as:

JavaServer Pages (JSP)
Servlets
JavaBeans

to modify and temporarily store data, interact with databases and web services, and render content in response to client requests.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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What is the

Java Enterprise Edition?

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Java EE (Enterprise Edition)

Java EE (Enterprise Edition) is a widely used platform containing a set of coordinated technologies that significantly reduce the cost and complexity of:

developing
deploying and
managing

multitier, server-centric applications.

Java EE builds upon the Java SE platform and provides a set of APIs (application programming interfaces) for developing and running portable, robust, scalable, reliable and secure server-side applications.

Java EE 6 is supported only by the GlassFish server v3.x.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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The Java EE platform uses a simplified programming model. XML deployment descriptors are optional. Instead, a developer can simply enter the information as an annotation directly into a Java source file, and the Java EE server will configure the component at deployment and runtime
With annotations, you put the specification information in your code next to the program element affected.

Java EE 6 Platform

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an architecture for implementing services as multitier applications that deliver the scalability, accessibility, and manageability needed by enterprise-level applications.
With this structure you can more easily change one of the tiers without compromising your entire application.
Business and presentation logic - to be implemented by the developer
Standard system services – to be provided by the Java EE platform

Java EE application model

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What is a

Java Servlet?

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Java Servlets

Servlets are Java classes that dynamically process requests and construct responses.
Server side replacement for CGI
Extensions to Java enabled web-servers
Inherently multi-threaded.
One thread per request.
Very efficient.
Platform independent.

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How do Servlets work?

Servlets run inside a Web Container - the component of the web server that runs and interacts with Servlets
Servlet is running on the server listening for requests
When a request comes in, a new thread is generated by the web container.

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What is a

Java EE Container?

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Java EE Containers

Java EE containers

are the interface between a Java component and the low-level platform-specific functionality (i.e. transaction and state management, multithreading, resource pooling, etc.) that supports the component.

provide for the separation of business logic from resource and lifecycle management.

this allows developers to focus on writing business logic rather than writing enterprise infrastructure.

The Java EE platform uses "containers" to simplify development.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Java EE Containers

When a request comes in:

a Servlet needs to be instantiated and create a new thread to handle the request.

call the Servlet’s doPost()or doGet() method and pass the HTTP request and HTTP response objects

get the request and the response to the Servlet

manage the life, death and resources of the Servlet

* All of the above are the tasks of the web container.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Java EE Containers

Java EE SERVER

From Bodoff et. al. 2005

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Figure: JEE Containers diagram

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Historically (Java Web App) �Server: response

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Client

Web browser

Operating

System

Web server

Servlet

(Java code)

Server

Operating System

Internet

Web Container Application

(Java code)

HTTP

TCP/IP

Webserver supports HTTP.

GET...

It’s the Container that gives

the Servlet the HTTP request

and response, and it’s the Container that calls the Servlet’s methods (e.g. doPost() or doGet())

<html>

<head>

</head>

<body>

...

<body>

</html>

<html>

<head>

</head>

<body>

...

<body>

</html>

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Historically (Java Web App) �Server: response

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Client

Web browser

Operating

System

Web server

Servlet

(Java code)

Server

Operating System

Internet

HTTP

TCP/IP

Webserver supports HTTP.

GET...

It’s the Container that gives

the Servlet the HTTP request

and response, and it’s the Container that calls the Servlet’s methods (e.g. doPost() or doGet())

<html>

<head>

</head>

<body>

...

<body>

</html>

<html>

<head>

</head>

<body>

...

<body>

</html>

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(Java Web App) Server: response

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Client

Web browser

Operating

System

Web server + Container

Servlet

(Java code)

Server

Operating System

Internet

HTTP

TCP/IP

Webserver supports HTTP.

GET...

It’s the Container that gives

the Servlet the HTTP request

and response, and it’s the Container that calls the Servlet’s methods (e.g. doPost() or doGet())

<html>

<head>

</head>

<body>

...

<body>

</html>

Grizzly is now the HTTP front end of the application server

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Java Servlets

Java Servlets simplify web development by providing infrastructure for component, communication, and session management in a web container that is integrated with a web server.

Writing Servlets is like writing Java codes that place an HTML page inside a Java class (this is the worst part of Servlets!)

(Historically!) requires a deployment descriptor (DD). This is in the form of an XML file.

Servlets do not have a main() method.
Servlets are under the control of another Java application called a Container

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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JavaBeans

manage the data flow between the following:

JavaBeans components are not considered Java EE components by the Java EE specification.

JavaBeans components have properties and have get and set methods for accessing the properties.

Client/Database	Server
application client or applet	components running on the Java EE server
database	Server components

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Enterprise JavaBeans (EJB)

Enterprise JavaBeans container handles:

distributed communication
threading
scaling
transaction management, etc.

has a new packaging! (see figure)

New EJB 3.1 Packaging

Older EJB Packaging

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Netbeans IDE

create a simple web application using NetBeans IDE
deploy it to a server, and
view its presentation in a browser

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NetBeans

A 3rd party Java Integrated Development Environment (IDE)

Comes with Java EE class libraries
bundled with GlassFish Sever Open Source Edition
Can deploy servlets, JSPs, and web services

Class libraries for Servlets, JSPs, Enterprise Java Beans, advanced XML

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Example: NetBeans Project

A Quick Tour of the IDE (v.6.9)

JSP, Java Bean, User-defined Java Class & Package, Get Method, User Interface

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Sample Project

Index.jsp

NameHandler.java

Main interface, Html with form

Invokes response.jsp through form action.

response.jsp

Class NameHandler containing user data

Generates the server’s response

Defines a JavaBean to connect the class NameHandler to

the user’s input via a form text field (name).

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Creating a new Web Application

New Project / Java Web

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Creating a new Web Application

Specify Project Name

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Creating a new Web Application

GlassFish Server

Web profile

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Java Application Server: Glassfish

GlassFish

is an open source application server project led by Sun Microsystems for the Java EE platform. The proprietary version is called Oracle GlassFish Enterprise Server. GlassFish is free software

It uses a derivative of Apache Tomcat as the servlet container for serving Web content, with an added component called Grizzly which uses Java NIO for scalability and speed.

Before the advent of the Java New I/O API (NIO), thread management issues made it impossible for a server to scale to thousands of users

Sun is the original creator of Tomcat

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Java Application Server: Glassfish

GlassFish is an open source (full) application server project led by Sun Microsystems for the Java EE platform. The proprietary version is called Oracle GlassFish Enterprise Server. GlassFish is free software.

It uses a derivative of Apache Tomcat as the servlet container for serving Web content, with an added component called Grizzly which uses Java NIO for scalability and speed.

On 25 March 2010, soon after the acquisition of Sun Microsystems, Oracle issued a Roadmap for versions 3.0.1, 3.1, 3.2 and 4.0 with themes revolving around clustering, virtualization and integration with Coherence and other Oracle technologies.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Glassfish vs. Tomcat

Historically, if you wanted to get good HTTP performance from Tomcat you really needed to have an Apache web server to sit in front of Tomcat which involved more setting up and extra administrative work.

Since GlassFish v1 (May 2006), Grizzly is the HTTP frontend of the application server.

It's a 100% Java NIO framework that provides the same performance as Apache, only it's written in Java and integrated straight into the application server.

Sun is the original creator of Tomcat

Not a full-application server

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Other Java web application-capable Servers

Blazix from Desiderata Software (1.5 Megabytes, JSP, Servlets and EJBs)
TomCat from Apache (Approx 6 Megabytes)
WebLogic from BEA Systems (Approx 40 Megabytes, JSP, Servlets and EJBs)
WebSphere from IBM (Approx 100 Megabytes, JSP, Servlets and EJBs)

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Commercial Deployment

Oracle GlassFish Server

delivers a flexible, lightweight and extensible Java EE 6 platform. It provides a small footprint, fully featured Java EE application server that is completely supported for commercial deployment and is available as a standalone offering.

Oracle WebLogic Server

designed to run the broader portfolio of Oracle Fusion Middleware and large-scale enterprise applications.
industry's most comprehensive Java platform for developing, deploying, and integrating enterprise applications.

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Creating a new Web Application

JSP File

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Creating a new Web Application

Sample Run

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Project: HelloWeb

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HelloWeb: Directories and Files

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Adding a Java source package and a source file

NameHandler.java

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Java Package

Right-click Source Packages

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Java Package

Add a Java Class, specify Package name

Java Package

a mechanism for organizing Java classes into namespaces
can be stored in compressed files called JAR files, allowing classes to download faster as a group rather than one at a time.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Java Package

Add a Java Class

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Java Package

Edit the Java Class

Declare a String variable inside the class declaration.

String name;

Add a constructor to the class:

public NameHandler()

Add the following line in the NameHandler() constructor:

name = null;

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Generating Getter and Setter Methods

Right-click name field in the Source editor

Selection: Name Field / Refactor / Encapsulate Fields

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Generating Getter and Setter Methods

Notice that Fields' Visibility is by default set to private, and Accessors' Visibility to public, indicating that the access modifier for class variable declaration will be specified as private, whereas getter and setter methods will be generated with public and private modifiers, respectively.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Generating Getter and Setter Methods

Select the Refactor button.

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Multimedia and Advance Web Technologies

Department of Computer Science

New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Notice that the variable declaration has changed.

set to private

Get and set functions with implementation have been added as well.

access modifier: public

Results of Refactoring

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Multimedia and Advance Web Technologies

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New I/O, usually called NIO, is a collection of Java programming language, is a collection of Java programming language APIs, is a collection of Java programming language APIs that offer features for intensiveI/O, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems, is a collection of Java programming language APIs that offer features for intensiveI/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] As of 2006, an extension to NIO, called NIO2, is being developed under JSR 203; JSR 203 is scheduled to be included in Java SE 7 ("Dolphin")

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Editing the Default JSP file

Adding and Customising

a Form, input text field, submit button

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Invoke the palette: from the menu, select (Window/Palette): or press Ctrl+Shift+8

expand HTML Forms

Inserting a Form

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expand HTML Forms and drag a Form item to a point after the <h1> tags in the Source Editor.

The Insert Form dialog box displays.

Inserting a Form

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Specify the following values:

Click OK.

Specifying an action

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An HTML form is automatically added to the index.jsp file.

Source Generated

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Drag a Text Input item to a point just before the </form> tag, then specify the following values:

Name: name
Type: text

Adding an Input Text Field

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Input Text Field

Source Generated

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Drag a Button item to a point just before the </form> tag. Specify the following values:

Label: OK
Type: submit

Click OK. An HTML button is added between the <form> tags.

Adding a Submit Button

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Type Enter your name: just before the first <input> tag, then change the default Hello World! text between the <h1> tags to Entry Form.

Adding some extra labels, tidying up your code

Right-click within the Source Editor and choose Format

(Alt-Shift-F) to tidy the format of your code.

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index.jsp: Source Generated

We would like to pass this to our server

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Creating a JSP file that generates the server’s response

response.jsp

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In the Projects window, right-click the HelloWeb project node and choose New > JSP. The New JSP File wizard opens.

Name the file response, and click Finish.

Notice that a response.jsp file node displays in the Projects window beneath index.jsp, and the new file opens in the Source Editor.

Adding a JSP File

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JSP Source File Generated: response.jsp

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In the Palette to the right of the Source Editor, expand JSP and drag a Use Bean item to a point just below the <body> tag in the Source Editor.

The Insert Use Bean dialog opens.

Specify the values shown in the following figure.

Adding a Use Bean item

The class NameHandler belongs to the package we have set earlier

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JSP Source File Generated: response.jsp

Notice that the <jsp:useBean> tag is added beneath the <body> tag.

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Drag a Set Bean Property item from the Palette to a point just before the <h1> tag and click OK.

In the <jsp:setProperty> tag that appears, delete the empty value attribute and edit as follows. Delete the value = "" attribute if the IDE created it! Otherwise, it overwrites the value for name that you pass in index.jsp.

Adding a Set Bean property item

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Drag a Set Bean Property item from the Palette to a point just before the <h1> tag and click OK.

In the <jsp:setProperty> tag that appears, delete the empty value attribute and edit as follows. Delete the value = "" attribute if the IDE created it! Otherwise, it overwrites the value for name that you pass in index.jsp.

Adding a Set Bean property item

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Drag a Get Bean Property item from the Palette and drop it after the comma between the <h1> tags.

Specify the following values in the Insert Get Bean Property dialog:

Bean Name: mybean
Property Name: name

Adding a Get Bean property item

Insert a Get Bean Property item here!

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the user input coming from index.jsp becomes a name/value pair that is passed to the request object.

When you set a property using the <jsp:setProperty> tag, you can specify the value according to the name of a property contained in the request object.

JSP Source Code Generated

Therefore, by setting property to name, you can retrieve the value specified by user input.

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Sample Run

User input

Response from the JSP file

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Sample Run

User input

Response from the JSP file

Index.jsp

NameHandler.java

Main interface, Html with form

Invokes response.jsp through form action.

response.jsp

Class NameHandler containing user data, get and set methods

Generates the server’s response

Defines a JavaBean to connect the class NameHandler to

the user’s input via a form text field (name).

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Project

Index.jsp

NameHandler.java

Main interface, Html with form

Invokes response.jsp through form action.

response.jsp

Class NameHandler containing user data, get and set methods

Generates the server’s response

Defines a JavaBean to connect the class NameHandler to

the user’s input via a form text field (name).

http://java.sun.com/blueprints/code/projectconventions.html

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The Java EE specification defines how the web application can be archived into a web application archive (WAR)

• WAR files are

– Java archives with a .war extension

– Packaged using the same specification as zip files

– Understood by all Java EE compliant application servers

• WAR files can be directly deployed in servlet containers such as Tomcat

Packaging Web Applications

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To make a WAR for your NetBeans project, right click on the project node and select Build Project.

• The WAR file will be placed in the “dist” sub-directory of your project folder

NetBeans WAR files

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The End

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Exercise

Q1. Explain J2SE, JEE and J2EE.

Q2. Explain Java web applications with its components.

Q3. What is Java Servlets.

Q4. How do servlets work?

Q5. Explain JEE containers with diagram.

Q6. Explain Java Servlets.

Q7. Explain Java Beans

Q8. What is EJB?

Q9. Explain Glassfish.

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Q10. What is the difference between Glassfish and Tomcat.

Q11. Explain Oracle GlassFish server and Oracle WebLogic server.

Q12. Explain the Web Application Archive (WAR).

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Q13. A Java platform comprises with supporting class libraries and .

Java ME
J2SE
J2EE
JVM

Q14. A Java web application generates interactive web pages containing various types of markup language and.

Ordered content
Static content
Dynamic content
None of the above

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Q15. Java EE builds upon the Java SE platform and provides a set of

CGI
APIs
SGI
FCI

Q16. XML deployment descriptors are.

Optional
Mandatory
Necessary
None of the above

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Q17. Servlets run inside a

Database query
Web container
Web architecture
XML

Q18. Servlets do not have a.

Override method
onCreate() method
main() method
All of the above

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Q19. GlassFish uses a derivative of Apache Tomcat as the

Servlet container
Web container
DB container
Object container

Q20. To make a WAR for your NetBeans project, right click on the project node and select

Debug project
Run project
Build project
Execute project

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