Transcript Creating Web Services

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Creating Web Services
Presented by
Ashraf Memon
Hands-on
Ashraf Memon, Ghulam 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 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)
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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;
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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);
}
}
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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
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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
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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
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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
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Next Chapter
• Create Web Service to Access
ASCII file