Jsp with mvc

Oct 31, 2012Download as PPTX, PDF0 likes2,889 views

The document discusses the Model-View-Controller (MVC) design pattern. It explains that MVC separates an application into three main components: the Model, the View, and the Controller. The Model manages the data logic, the View displays the presentation logic, and the Controller handles user input and interaction between the Model and View. Some key benefits of MVC include flexibility to change views without affecting other components, and separating concerns for improved maintenance and testing.

Overview of Design Patterns
&
The MVC Design Pattern
Sapana Mehta

Sapana Mehta (CS-6V81)

J2EE

• Components
– Enterprise Java Beans (EJB)
– Java Server Pages (JSP)
– Servlets
• Containers (service providers)
– Web container
– Bean Container
• Connectors (connection service providers)

Sapana Mehta (CS-6V81)

J2EE and Design Patterns

• J2EE: AN OPERATING SYSTEM FOR THE WEB
Enterprise web applications, which live on
networks and are accessible through
browsers, are redefining Enterprise Web
Software. This is the next wave of computing.

• The J2EE architecture is built to enable
component developers to use a Model View
Controller (MVC) Design Pattern.

Sapana Mehta (CS-6V81)

MVC continued

• Model encapsulates the core data and
functionality
• View encapsulates the presentation of the data
there can be many views of the common data
• Controller accepts input from the user and
makes request from the model for the data to
produce a new view.

Sapana Mehta (CS-6V81)

MVC Structure for J2EE

Sapana Mehta (CS-6V81)

MVC Architecture
• The Model represents the structure of the data in the
application, as well as application-specific operations
on those data.

• A View (of which there may be many) presents data in
some form to a user, in the context of some
application function.

• A Controller translates user actions (mouse
motions, keystrokes, words spoken, etc.) and user
input into application function calls on the model, and
selects the appropriate View based on user preferences
and Model state.

Sapana Mehta (CS-6V81)

Advantages of MVC

• Separating Model from View (that is,
separating data representation from
presentation)
- easy to add multiple data presentations for
the same data,
-facilitates adding new types of data
presentation as technology develops.
-Model and View components can vary
independently enhancing maintainability,
extensibility, and testability.

Sapana Mehta (CS-6V81)

Advantages of MVC design
Pattern
• Separating Controller from View (application behavior
from presentation)
- permits run-time selection of appropriate
Views based on workflow, user preferences,
or Model state.
• Separating Controller from Model (application behavior
from data representation)
- allows configurable mapping of user actions
on the Controller to application functions on
the Model.

Sapana Mehta (CS-6V81)

Consequences or Benefits

• We make changes without bringing down the
server.
• We leave the core code alone
• We can have multiple versions of the same
data displayed
• We can test our changes in the actual
environment.
• We have achieved “separation of concerns”

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This document provides an overview of advanced I/O functions for network programming in UNIX, including socket timeouts, recv/send functions, readv/writev functions, recvmsg/sendmsg functions, ancillary data, determining queued data amounts, sockets and standard I/O, and T/TCP. It describes various ways to implement timeouts for socket I/O, flags and parameters for different I/O functions, using scatter-gather I/O, receiving ancillary protocol-specific data, and how T/TCP can avoid the three-way handshake for repeat clients and servers.

Npc08vamsitricks

This document describes how to create UDP client-server programs in C using socket functions like sendto(), recvfrom(), and connect(). It discusses key differences between TCP and UDP, such as UDP being connectionless and unreliable. Example code is provided for a UDP echo server and client that exchange datagrams. Issues like lost datagrams, lack of flow control, and determining the outgoing interface are also covered. The document concludes by showing how to create a server that handles both TCP and UDP connections using select().

Unit 3vamsitricks

Mobile IP allows mobile nodes to change their point of attachment to the internet while maintaining the same IP address. It uses home and foreign agents and a care-of address to transparently route packets to the mobile node's changing locations. The mobile node discovers agents through advertisements, registers its care-of address with its home agent, and packets are tunneled between the home and foreign agents to reach the mobile node.

Unit 5vamsitricks

The document discusses database issues related to mobile computing. It describes how mobile devices cache data from servers to reduce latency when the device is offline. The cached data is stored locally in a process called hoarding. It discusses different database architectures and cache invalidation mechanisms used to maintain consistency between cached and server data. These include stateless asynchronous, stateful asynchronous, and stateful synchronous approaches. Maintaining cache consistency through invalidation reports and periodic updates is important for reliable usage of cached data on mobile devices.

Unit 2vamsitricks

The document discusses various medium access control (MAC) protocols for wireless networks. It describes challenges with applying carrier sense multiple access with collision detection (CSMA/CD) to wireless networks due to problems like hidden and exposed terminals. It then covers different MAC schemes like space division multiple access (SDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), and code division multiple access (CDMA) that aim to address these challenges. Specific protocols discussed include Aloha, slotted Aloha, and how TDMA can be used for fixed or dynamic allocation of time slots.

Unit 7vamsitricks

Mobile ad hoc networks (MANETs) are wireless networks without a fixed infrastructure. Each node acts as both a host and a router, forwarding packets for other nodes. Routing in MANETs is challenging due to the dynamic topology from node mobility. Common routing protocols for MANETs include proactive (table-driven) protocols that maintain up-to-date routing tables and reactive (on-demand) protocols that find routes only when needed to limit overhead. Dynamic Source Routing (DSR) is a reactive routing protocol that uses source routing, where the data packet carries the complete hop-by-hop route to the destination.

Unit 6vamsitricks

This document discusses different mechanisms for data dissemination to mobile devices. It describes push-based mechanisms where data is broadcast from servers to devices without requests. Pull-based mechanisms allow devices to request specific data from servers. Hybrid mechanisms combine push and pull. The document focuses on communication asymmetry in mobile networks and how this impacts efficient data dissemination. It provides examples and classifications of different data delivery approaches for wireless applications.

Unit 4vamsitricks

The document discusses TCP and its mechanisms for reliable data transfer over networks. TCP uses congestion control mechanisms like slow start and congestion avoidance to gradually increase transmission rates and avoid overwhelming network capacity. It also uses fast retransmit and fast recovery to address packet losses without causing unnecessary slow starts. However, TCP faces challenges in wireless environments like mobile networks due to factors such as packet losses and handoffs.

Unit4wtvamsitricks

The document discusses JavaBeans, which are reusable software components that can be visually manipulated in builder tools, and outlines their characteristics including having public properties, events, and methods, as well as how they are used to create reusable components and integrate with development tools. It also covers concepts related to JavaBeans such as properties, events, customization, and how they are deployed and used as client-side components.

Unit3wtvamsitricks

Unit2wtvamsitricks

JavaScript is used to add interactivity to web pages. It can validate forms, detect browsers, create cookies, and more. JavaScript is the most popular scripting language on the internet and works in all major browsers. JavaScript code is usually embedded directly into HTML pages and is an interpreted language. Java and JavaScript are two completely different languages - Java is more complex while JavaScript is lightweight.

Unit 6vamsitricks

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Npc08vamsitricks

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Jsp with mvc

1. Overview of Design Patterns & The MVC Design Pattern Sapana Mehta

2. Sapana Mehta (CS-6V81) J2EE • Components – Enterprise Java Beans (EJB) – Java Server Pages (JSP) – Servlets • Containers (service providers) – Web container – Bean Container • Connectors (connection service providers)

3. Sapana Mehta (CS-6V81)

4. Sapana Mehta (CS-6V81) J2EE and Design Patterns • J2EE: AN OPERATING SYSTEM FOR THE WEB Enterprise web applications, which live on networks and are accessible through browsers, are redefining Enterprise Web Software. This is the next wave of computing. • The J2EE architecture is built to enable component developers to use a Model View Controller (MVC) Design Pattern.

5. Sapana Mehta (CS-6V81) MVC continued • Model encapsulates the core data and functionality • View encapsulates the presentation of the data there can be many views of the common data • Controller accepts input from the user and makes request from the model for the data to produce a new view.

6. Sapana Mehta (CS-6V81) MVC Structure for J2EE

7. Sapana Mehta (CS-6V81) MVC Architecture • The Model represents the structure of the data in the application, as well as application-specific operations on those data. • A View (of which there may be many) presents data in some form to a user, in the context of some application function. • A Controller translates user actions (mouse motions, keystrokes, words spoken, etc.) and user input into application function calls on the model, and selects the appropriate View based on user preferences and Model state.

8. Sapana Mehta (CS-6V81) Advantages of MVC • Separating Model from View (that is, separating data representation from presentation) - easy to add multiple data presentations for the same data, -facilitates adding new types of data presentation as technology develops. -Model and View components can vary independently enhancing maintainability, extensibility, and testability.

9. Sapana Mehta (CS-6V81) Advantages of MVC design Pattern • Separating Controller from View (application behavior from presentation) - permits run-time selection of appropriate Views based on workflow, user preferences, or Model state. • Separating Controller from Model (application behavior from data representation) - allows configurable mapping of user actions on the Controller to application functions on the Model.

10. Sapana Mehta (CS-6V81) Consequences or Benefits • We make changes without bringing down the server. • We leave the core code alone • We can have multiple versions of the same data displayed • We can test our changes in the actual environment. • We have achieved “separation of concerns”

Jsp with mvc

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