a presentation for COMP6017 coursework

1. Group15 Rest
Yuan Gao
Ning Ma
Bin Cai

2. Overview
Introduction
Technologies and toolkits
Architecture
Implementation & Security
Deploy & Test
Analysis and evaluation

3. Introduction
RESTful Web Services is different from SOAP-
style services
using HTTP GET PUT POST DELETE
Unique URI to describe Resource

4. Introduction
Client
3 Services:
TravelAgent, Flight, Hotel
Resources:
/flight
/hotel
/booking
/query

5. Technologies and
Toolkits
AJAX: send request and receive response
XML: store and transmit data
JAX-RS (JSR 311): Java API for RESTful Web
Services

6. Technologies and
Toolkits
Maven: project management
Jersey: JAX-RS Reference Implementation for
building RESTful Web services
Grizzly: Web application container

7. Architecture
Diagram

8. Implementation
define classes:
import import
javax.xml.bind.annotation.XmlRootElement; javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement @XmlRootElement
public class Flight { public class Hotel {
! ! private int Id;
! private int flightNo; ! private String Name;
! private String from; ! private int price;
! private String to; ! private String address;
! private int departTime; ! public Hotel() {}
! private int arriveTime; ...
! private int price;
! public Flight() {}
...
TravelAgent, FlightResource, HotelResource...etc...

9. Implementation
Jersey API annotation:
@Path
@GET
@POST
@Produces
...
Let’s look at some pieces of code as example:

10. Some code...
@Path("/flight")
@Produces("application/xml")
public class FlightResource {
!
! public TreeMap<Integer, Flight> flightMap = new TreeMap<Integer, Flight>();
...
! @GET
! public List<Flight> getFlights() {
! List<Flight> flights = new ArrayList<Flight>();
! flights.addAll(getFlightMap().values());
! return flights;
! }

11. Some code...
...
@GET
! @Path("{flightNo}")
! public Flight getFlight(@PathParam("flightNo") int cId) {
! return getFlightMap().get(cId);
! }
...

12. Security
HTTPS: use class HTTPSProperties to set
javax.net.ssl.HostnameVerifier and
javax.net.ssl.SSLContext
@Context SecurityContext customer
if (customer.isUserInRole("user") {
return new Flight();
} else {
return “please provide effective customer”;
}

13. Deploy
<web-app>
<servlet>
<servlet-name>Jersey Web Application</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>uk.ac.soton.ecs.comp6017</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey Web Application</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>

14. Test
use Jersey client api to set up test case
try {
! ! System.out.println("==> Test 1: Get all flight ");
!
! ! ClientConfig config = new DefaultClientConfig();
! ! Client client = Client.create(config);
! ! client.getProperties().put(ClientConfig.PROPERTY_FOLLOW_REDIRECTS, true);
! ! WebResource service = client.resource("http://localhost:8080/");
System.out.println(service.path("rest2011").path("travelagent").type(MediaType.APPLICATION_FORM_
URLENCODED).get(String.class));
System.out.println("n");
! ｝
...

15. Analysis and
evaluation
Understanding REST architecture
Use toolkits to implement scenario
Challenges
Work as a team

16. Thank you!