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Java.NET: Integration of Java and .NET

Sukhpal Singh Gill Computer Science and Engineering Department, Thapar University, Patiala, Punjab, India-147004

ssgill[at]thapar[dot]edu

Introduction

This article describes how integrate Java with Microsoft Technology. Sometimes there may be

need an application where integrate both technologies. This article describes how to call some

Java methods from .NET code, and pass some values to Java or .NET and vice versa. This is a

simple ASP.NET application, which interacts with Java Applets while performing

another operation. The application is very simple to do, but the main thing behind the scene is

the idea and implementation logic.

Background

Two IDE used for this Application

1. Visual Studio 2005

2. Eclipse

This diagram describes the main flow between Java and .NET.

The main concept behind the scene is Applet, created a JAR file which contains one applet and

called Java methods using applet from .NET. Once you get the data using JavaScript, it is up to

you to decide how you going to use it on the server side.

Using the Code

First of all, create a JAR file using Java. As already explained, used Eclipse, just take a look the

hierarchy of Java applet and function.

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These methods are created and created a "Jar" file, named JavaNet.Jar. Now going to interact

with this using .NET. The following is the Java Applet code.

//Welcome Methods will call from .NET

public void WelcomeToJava()

{

JOptionPane.showMessageDialog(null,"Hi .NET Welcome To Java");

}

//Return Value To .NET

public String MessageForNetFromJava()

{

return "Hi .NET, Nice To Meet you !!";

}

//Take Argument from .NET and Reply

public String MessageFromNETServerSide(String Message)

{

return "From Java : " + Message ;

}

Now, in the ASP.NET page, used an Applet tag for invoking the applet. Now from the

ID, MyJavaApplet, call any Java methods from file.

The following is the JavaScript using to call all Java methods

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var ID= "<%=txtnum1.ClientID%>"; //Read Client ID of TextBox

//Call Java Welcome Message

function btnCallJava_onclick()

{

MyJavaApplet.WelcomeToJava();

}

// Get Message From Java

function btnNetMessage_onclick() {

var message=MyJavaApplet.MessageForNetFromJava();

alert(message);

}

//Pass Argument To Java Methods

function btnServerValueSend_onclick()

{

var Message= document.getElementById(ID);

var result=MyJavaApplet.MessageFromNETServerSide(Message.value);

alert(result);

}

OutPut

Call Welcome Message

Send Server Side Value To Java

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Get Message From Java

Points of Interest

.NET and Java, both are leading the world's technology, and by integrating both of them to do

anything that you want to do.

Sukhpal Singh Gill obtained the Degree of Master of Engineering in Software Engineering from Thapar

University, Patiala. Mr. Singh received the Gold Medal in Master of Engineering in Software Engineering.

Presently he is pursuing Doctoral degree in Cloud Computing from Thapar University, Patiala. Mr. Singh

is on the Roll-of-honor being DST INSPIRE FELLOW as a SRF Professional. He has done certifications

in Cloud Computing Fundamentals, including Introduction to Cloud Computing and Aneka Platform (US

Patented) by ManjraSoft Pty Ltd, Australia and Certification of Rational Software Architect (RSA) by IBM

India. His research interests include Software Engineering, Cloud Computing, Operating System and

Databases. He has more than 20 research publications in reputed journals and conferences.

Please write your detailed thoughts on how you might think that we can work together @

ssgill[at]thapar[dot]edu