session 6 - rmi and mail

8/3/2019 Session 6 - RMI and Mail

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Session 6

Remote Method Invocation

JavaMail



Slide 2/27

Introduction to I18N and L10N

Why need I18N and L10N?

How to implements?

Components of I18N and L10N

Networking

Concept of Socket

Using of Socket Datagram and using Datagram



Slide 3/27

Module 1 : Introduce to R MI

Module 2 : JavaMail API



Slide 4/27

Introduction to R MI

R MI Architecture

Implement R MI



Slide 6/27

RMI

Client invokingmethods of remote

Java objects

RemoteJava Object

RemoteJava

Object

RemoteJava Object

RMI allows objects in one JVM toinvoke methods of objects in anotherJVM.

Distributed object systems require that objects running in different addressspaces be able to communicate witheach other.



Slide 7/27

Although Java provides you with Socket Programming, it is

a low level technology which only transmits bytes and not

objects. R MI allows to serialize and transmit objects.

Allow developers can create distributed application using

java.



Slide 8/27

RMI architecture

Stub/ Skeleton layer

Remote reference layer

Transport layer

Stub proxy for remoteobject .Skeleton remote proxy

for object .

Remote reference layer -Supports communicationbetween stub and skeleton.

Transport Layer - Sets up andmanages connectionsbetween different JVMs.



Slide 9/27

RMI architecture Contd«

Client Server

Application

Stub Layer

Remote ReferenceLayer

Transport Layer

Application

Skeleton Layer

Remote ReferenceLayer

Transport LayerNetwork



Slide 10/27

The components of a R MI application are

Remote Interface

Implement class

Stub

Skeleton



Slide 11/27

Define an interface which extends java.rmi.Remote

Declare the remote methods signatures

All these methods should be qualified to throw

java.rmi.RemoteException



Slide 12/27

Define a class which extends java.rmi.server.UnicastRemoteObject

Implement the remote interface(s)

Provide a constructor which throws RemoteException

Provide the implementation of all remote methods



Slide 14/27



Slide 15/27

A R MI Client is any application which needs to invoke the

remote methods of a R MI Server.

Lookup in the R MIRegistry for the name

Use the Remote object reference to invoke methods

Use the Remote object reference to invoke methods



Slide 16/27

Introduction to JavaMail APIs

JavaMail API

Steps for E-mail



Slide 17/27

The JavaMail API is not a part of the core package. It is a

standard extension and has to be downloaded separately. The

JavaMail API is used to read, compose and send electronic

messages.

Mail Protocols

SMTP (Simple message transfer protocol

POP (Post Office Protocol)

IMAP (Internet Message Access Protocol)

MIME (Multipurpose Internet Mail Extensions)



Slide 18/27

In the context of a mailing system, a session is lasting

connection between a user and a host, usually a server.

Session starts when the service is first provided and closes

when the service is ended.

The javax.mail package provides a class Session to define a

basic mail session.



Slide 19/27

The Session class provides the following two methods to create osession

public static Session getInstance(Properties props)

public static session getDefaultInstance(Properties p)



Slide 20/27

The javax.mail.internet.MimeMessage class is a subclassof the Message class and is used to create a message object.

Create an empty message object from a session

Set the attributes required

Set the content type of the message

Set the content of the message



Slide 21/27

The address is an Internet email address of a user for specificdomain. Generally the address is of the form

[email protected].

The javax.mail.internet.InternetAddress is generally used

to create the address required for sender and its recipients.



Slide 22/27

Once the message object is create and its required attributesare set, the final step involves sending the message. The

javax.mail.Transport class is used to send the message to

all its recipients.



Slide 23/27

send(Message msg)

send(Message msg, Address[] address)



Slide 24/27

A mail service provider maintains a store which contains the

folder where your messages are kept. To retrieve a messagefrom email service, you have to gain access to the store first.

The POP3 protocol maintains its own store. Similarly, the

IMAP maintains its own store.



Slide 26/27

Folder is the namespace where your message are available.

For the protocol POP3 there is only one folder INBOX.

Retrieve the default folder

± Folder getDefaultFolder()

From the default folder retrieve the INBOX

± Folder getFolder(String name)

Open the INBOX folder

± open(int mode)

Retrieve the message ± Message[] getMessages()



Slide 27/27

Introduction to R MI

Need for R MI Architecture

R MI Architecture

Working of R MI

Implement R MI Application

Introduction to JavaMail API

Components of JavaMail

Working of JavaMail

session 6 - rmi and mail

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