Creating Web Services

1

Creating Web Services

Presented by

Ashraf Memon


Hands
-
on

Ashraf Memon, Ghulam Memon



2

Overview

•
Writing service classes in Java

•
Generating service

•
Deploying services with Apache
Axis

•
Generating client files and testing
them

3

Writing service classes in Java

•
Service classes are similar to
normal Java classes

–
Any existing Java Class can be
converted into web service

–
Keep the input/output interface
simple (primitive types such as
String, int, boolean, double)

4

Writing service classes in Java

•
Class contains 1
function

which
performs addition.

•
Function
signature
is

public String sum(int num1, int num2)

•
Function implementation is

int answer = num1+num2;

return "Sum of "+num1+" and "+num2+"

is "+answer;

5

Writing service classes in Java

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;

Math sampleProgram = new Math();


String reply = sampleProgram.getSum(3,4);


System.out.println(reply);


}

}

6

Generating Service

•
Navigate to solutions directory
c:
\
data
\
csig05
\
ws
\
solutions

•
Open command prompt by right clicking on the math
directory and selecting “Command Prompt Here”

•
Change to math directory by typing following at the
command prompt


cd math

•
Compile Math.java file by typing following at command
prompt


javac Math.java

•
Run program by typing following at command prompt


java Math

•
Output should be


Sum of 3 and 4 is 7

•
Type exit on the command prompt to quit

7

Deploying services with Apache Axis

•
Copy generated class file to
C:
\
tools
\
tomcat4.1
\
webapps
\
axis
\
WEB
-
INF
\
classes
\


•
Open using any text editor deployMath.wsdd from
C:
\
tools
\
tomcat4.1
\
webapps
\
axis
\
WEB
-
INF
\
classes
\


•
Get yourself familiar with the contents

8

Deploying services with Apache Axis

•
Navigate to C:
\
tools
\
tomcat4.1
\
webapps
\
axis
\
WEB
-
INF
\

•
Open command prompt by right clicking on the classes
directory and selecting “Command Prompt Here”

•
Change to classes directory by typing following at the
command prompt


cd classes

•
Set classpath by typing classpath.bat on the command
prompt

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

•
This will deploy math webservice on Axis SOAP Server

•
Test it by going to
http://localhost/axis/

and navigating
to Math Service

9

Generating client files and testing them

•
Change directory to c:
\
data
\
csig05
\
ws
\
solutions
\
math


by typing “cd c:
\
data
\
csig05
\
ws
\
solutions
\
math” on the
command prompt

•
Compile MathServiceClient.java by typing following on
the command prompt

javac MathServiceClient.java

•
Execute Client by typing following on the command
prompt

java MathServiceClient

•
Output should be


MathService.getSum(100,333) = Sum of 100 and 333 is
433

10

•
Create Web Service to Access
ASCII file

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