Szoftverfejlesztés J2EE platformon - Labor: Web Service

← Vissza az előző oldalra – Szoftverfejlesztés J2EE platformon

Web Service laborok más tárgyakból

Integrált információs rendszerek — Visual Studio 2005 + Web Service Enhancement 3
Elosztott rendszerek — Visual Studio 2003

Devizaváltó Web Service implementálása

New Project / Enterprise Application
- Name: WSLabor EJB es Web Application Module is kell
New Project / Web Application
- Name: WSLaborService
- Add to Enterprise Application: WSLabor
WSLaborService / Source Packages / New Java Class...
- Name: RateDescriptor
- Package: ws.labor
WSLaborService / Source Packages / New Java Class...
- Name: Converter
- Package: ws.labor

RateDescriptor bean

package ws.labor;

public class RateDescriptor {
	 private String from;
	 private String to;
				
	 public RateDescriptor() {
	 }
	 
	 public RateDescriptor(String from, String to) {
		  this.setFrom(from);
		  this.setTo(to);
	 }

	 // getterek es setterek generalasa:
	 // context menuben Refactor / Encapsulate Fields...
	 public String getFrom() {
		  return from;
	 }

	 public void setFrom(String from) {
		  this.from = from;
	 }

	 public String getTo() {
		  return to;
	 }

	 public void setTo(String to) {
		  this.to = to;
	 }

	 // Ctrl+I: felsorolja az override-olhato metodusokat
	 public boolean equals(Object obj) {
		  if (!(obj instanceof RateDescriptor)) return false;
		  if (this==obj) return true;
		  RateDescriptor d = (RateDescriptor) obj;
		  return from.equals(d.from) && to.equals(d.to);
	 }

	 public String toString() {
		  return from + " -> " + to;
	 }

	 public int hashCode() {
		  return from.hashCode() ^ to.hashCode();
	 }
}

Converter service

package ws.labor;

import java.util.HashMap;
import java.util.Map;
import javax.jws.WebMethod;
import javax.jws.WebService;

@WebService()
public class Converter {
	 
	 Map<RateDescriptor, Double> rates = new HashMap<RateDescriptor, Double>();
	 
	 public Converter() {
		  rates.put(new RateDescriptor("HUF", "EUR"), 260.0);
		  rates.put(new RateDescriptor("HUF", "USD"), 210.0);
	 }
	 
	 @WebMethod
	 public Double getRate1(RateDescriptor d) {
		  return rates.get(d);
	 }
				
	 // Web Service nem tamogatja az overload-olt metodus neveket
	 @WebMethod
	 public Double getRate2(String from, String to) {
		  return rates.get(new RateDescriptor(from, to));
	 }
}

Deploy, majd a szerver logból másoljuk ki az url-t es írjuk utána, hogy =?wsdl=. =<xsd:schema>/<import>@schemaLocation= alatt vannak a metódus deklarációk.

Devizaváltó Web Service meghívása

WSLabor-war / Source Packages / New Servlet
- name: Converter

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
	 response.setContentType("text/html;charset=UTF-8");
	 PrintWriter out = response.getWriter();

	 out.println("<html>");
	 out.println("<head>");
	 out.println("<title>Servlet Converter</title>");
	 out.println("</head>");
	 out.println("<body>");
	 out.println("<h1>Servlet Converter at " + request.getContextPath () + "</h1>");

	 out.println("<form method='post'>");
	 out.println("From: <input type='text' name='from'><br>");
	 out.println("To: <input type='text' name='to'><br>");
	 out.println("<input type='submit' value='Get Rate!'><br>");
	 out.println("</form>");

	 String from = request.getParameter("from");
	 String to = request.getParameter("to");

	 if (from!=null && to!=null) {

	 }

	 out.println("</body>");
	 out.println("</html>");
	 out.close();
}

WSLabor-war / New / Web Service Client
- Project: Browse-zal valasszuk ki a Convertert
- Package: ws.labor.client
WSLabor-war / Web Service References / ConverterService / ConverterService / ConverterPort / getRate2-t huzzuk at az =if (from!=null && to!=null) { }= blokk belsejebe.

Deploy
Ha nem megy, mert nem talalja a web service-t, Runtime / Servers / Sun AppServer / Applications / Web Applications / WSLaborService / Undeploy, majd deploy ujra.

Járatkereső Web Service implementálása EJB modulban

WSLabor-ejb-ben New Java Class
- Name: AirLineBean
- Package: ws.labor.ejb

public class AirLineBean {
	 private int id;
	 private String source, destination;
	 private double price;
	 private String currency;

	 // + default es parameterezett konstruktorok

	 // + getterek es setterek
}

Hozzunk letre egy Stateless Session beant ugyanabba a package-be TravelSession neven.

TravelSessionBean

package ws.labor.ejb;

import java.util.ArrayList;
import java.util.List;
import javax.ejb.Stateless;
import javax.jws.WebMethod;
import javax.jws.WebService;

@Stateless
@WebService()
public class TravelSessionBean implements ws.labor.ejb.TravelSessionLocal {
	 
	 List<AirLineBean> airlines = new ArrayList<AirLineBean>();
	 
	 public TravelSessionBean() {
		  airlines.add(new AirLineBean(1, "Budapest", "New York", 200000.0, "HUF"));
		  airlines.add(new AirLineBean(2, "Budapest", "New York", 180000.0, "HUF"));
		  airlines.add(new AirLineBean(3, "Budapest", "Parizs", 30000.0, "HUF"));
	 }

	 @WebMethod()
	 public AirLineBean[] searchAirLine(String source, String destination) {
		  List<AirLineBean> result = new ArrayList<AirLineBean>();
		  for (AirLineBean alb : airlines) {
				if ((source==null || alb.getSource().equals(source)) &&
						 (destination==null || alb.getDestination().equals(destination))) {
					 result.add(alb);
				}
		  }
		  return result.toArray(new AirLineBean[result.size()]);
	 }
}

Tesztelés

Runtime / Servers / Sun AppServer / View Admin Console
Web Services / TravelSessionBean / Test
Probaljuk ki ugy is, hogy a kiindulasi es a cel allomast is megadjuk es ugy is, hogy csak az egyiket.

Önálló feladat

Keszitsunk egy webes klienst a TravelSessionBean-hez
A kliens kerje le a talalatokat, es hivja meg a Converter service-t, ha nem stimmel a penznem.

-- Peti - 2006.11.08.