This document provides an introduction to RESTful web services, explaining the stateless client-server architecture and the use of HTTP methods to interact with these services. It discusses the Java API for RESTful web services (JAX-RS) and its annotations that facilitate web service development. The document also includes practical examples for setting up a database and creating tables for a user web service application.

1. Distributed Systems
Lecture -6-
Created by :
Eng. Ghadeer Al Hasan
Restful Web Services

2. Intro 1
• REST is the acronymfor REpresentational State Transfer.
• REST is an architectural style for developing applications that can be accessed over the network.
• Restful Web Services is a statelessclient-server architecture where web services are resources and can
be identified by their URIs.
• REST Client applications can use HTTP GET/POSTmethods to invoke Restful web services.
• REST doesn’t specify any specificprotocol to use, but in almost all casesit’s used over HTTP/HTTPS.
• We can use XML, JSON, text or any other type of data for request and response.

3. Java RESTful Web Services API 2
• Java API for RESTful Web Services (JAX-RS) is the Java API for creating RESTweb services.
• JAX-RS uses annotations to simplifythe development and deployment of web services.
• JAX-RSis part of JDK, so you don’t needto include anything to use it’s annotations

4. Restful Web Services Annotations 3
Some of the importantJAX-RS annotations are:
• @Path: used to specify the relative path of classand methods. We can get the URI of a webservice
by scanning the Pathannotationvalue.
• @GET , @PUT , @POST , @DELETEand @HEAD: usedto specify the HTTPrequest type for a
method.
• @Produces , @Consumes : usedto specify therequest and responsetypes.
• @PathParam: used to bindthe method parameter to pathvalue by parsing it.

5. UserWS Example

6. Requirement 5
- Install “Wamp Server” on your machine
- Create Database “RestWS”
- Create Tables…

7. Create Tables 6
create table Accounts (
accountId bigint not null primary key AUTO_INCREMENT,
username varchar(100) not null,
password varchar(100) not null);
)
create table Users(
userId bigint not null primary key AUTO_INCREMENT,
firstName varchar(200) not null,
lastName varchar(200) not null,
BirthDate varchar(30) not null,
gender bit not null, accountId bigint not null,
foreign key (accountId) references Accounts(accountId)
);

8. AccountsFacadeREST Class 7

9. AccountsFacadeREST Class 8

10. UsersFacadeREST Class 9

11. UsersFacadeREST Class… 10

12. Test Services 11

13. Test Services 12

14. References 13
- YouTube link
https://www.youtube.com/playlist?list=PLtDIUAtyP4lhV7CsYfLuIx26UeG4J-ujZ
- GitHub
https://github.com/Ghadeerof

15. End Lecture