Creating Web Services

Presented byAshraf Memon

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Overview

• Writing service classes in Java• Generating service• Deploying services with Apache Axis• Generating client files and testing them

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Writing service classes in Java

• Service classes are exactly similar to normal Java classes:– Nothing new to learn from development

perspective– Any existing Java Class can be converted into

web service.• Next slide explains fragments of simple

Java class which adds two numbers.

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Writing service classes in Java (contd)

• Class contains 1 function which performs addition.

• Function signature ispublic String sum(int num1, int num2)

• Function implementation isint answer = num1+num2;return "Sum of "+num1+" and "+num2+" is "+answer;

• Complete class code follows on next slide.

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Writing service classes in Java (contd)

public class Math {public String getSum(int num1, int num2){

int answer = num1+num2; return "Sum of ” + num1 + " and "+ num2 + " is ” + answer; }public static void main(String[] args) { int num1=3; int num2=4;

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Writing service classes in Java (contd)

Math sampleProgram = new Math(); String reply = sampleProgram.getSum(3,4); System.out.println(reply); }}

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Generating Service

• Download MathService directory from ftp://dotnet.sdsc.edu/CSIG-WS/

• Save directory to C:\training\user\code• Compile Math.java file by typing following at

command promptjavac Math.java

• Run program by typing following at command prompt

java Math

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Generating Service (contd)

• Output should beSum of 3 and 4 is 7

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Deploying services with Apache Axis

• Copy generated class file to C:\training\tools\tomcat\webapps\axis\WEB-INF\classes\

• Open deployMath.wsdd in Textpad (Explanation by instructor)

• Close file.

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Deploying services with Apache Axis(contd)

• Set classpath by typing classpath at command prompt

• Execute deployment descriptor by typing deploy deployMath.wsdd at command prompt.

• This deploys webservice on Axis SOAP Server.

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Generating client files and testing them(contd)

• Compile MathServiceClient.java by typing following at command prompt– javac MathServiceClient.java

• Execute Client by typing following at command prompt– java MathServiceClient

• Output should beMathService.getSum(5,6) = Sum of 5 and 6 is 11