Apresentação sobre Web Services

1. Gustavo Loureiro dos Reis
Leonardo César de Sousa Campos
Victor da Silva Montalvão

2. • Componentes da Aplicação
• utilizam Protocolos Abertos
• Completo e Autodescrito
• Disponibilizados através da
Web para outras aplicações

3. Arquivo .asmx – extensão ASP.NET para XML Web Services
<%@ WebService Language="VBScript" Class="TempConvert" %>
Imports System
Imports System.Web.Services
Public Class TempConvert :Inherits WebService
<WebMethod()> Public Function FahrenheitToCelsius
(ByVal Fahrenheit As String) As String
dim fahr
fahr=trim(replace(Fahrenheit,",","."))
if fahr="" or IsNumeric(fahr)=false then return "Error"
return ((((fahr) - 32) / 9) * 5)
end function
<WebMethod()> Public Function CelsiusToFahrenheit
(ByVal Celsius As String) As String
dim cel
cel=trim(replace(Celsius,",","."))
if cel="" or IsNumeric(cel)=false then return "Error"
return ((((cel) * 9) / 5) + 32)
end function
end class
http://www.w3schools.com/webservices/ws_example.asp

5. Transport Protocol
• HTTP, FTP, SMTP
Messaging Protocol
• SOAP, WS-Addressing
Description Protocol
• Public Interface
• WSDL
Discovery Protocol
• Available Services
• UDDL*

6. • Protocolo baseado em XML
• Troca de informações via HTTP
Blocks
Envelope
Header
Body
Fault

7. POST /InStock HTTP/1.1
Host: www.example.org
Content-Type: application/soap+xml; charset=utf-8
Content-Length: nnn
<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
<soap:Body xmlns:m="http://www.example.org/stock">
<m:GetStockPrice>
HTTP/1.1 200 OK
<m:StockName>IBM</m:StockName>
Content-Type: application/soap+xml; charset=utf-8
</m:GetStockPrice>
Content-Length: nnn
</soap:Body>
<?xml version="1.0"?>
</soap:Envelope>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-
encoding">
<soap:Body xmlns:m="http://www.example.org/stock">
<m:GetStockPriceResponse>
<m:Price>34.5</m:Price>
</m:GetStockPriceResponse>
</soap:Body>
</soap:Envelope>

8. public HTTPRequest()
{
try {
HttpClient httpclient = new DefaultHttpClient();
String body="Data";
String bodyLength=new Integer(body.length()).toString();
System.out.println(bodyLength);
URI uri=new URI("SOMEURL?Param1=1234&Param2=abcd");
HttpPost httpPost = new HttpPost(uri);
httpPost.addHeader( "SOAPAction", strReferenceToSoapActionValue );
StringEntity entity = new StringEntity(body,
"text/xml",HTTP.DEFAULT_CONTENT_CHARSET);
httpPost.setEntity(entity);
RequestWrapper requestWrapper=new RequestWrapper(httpPost);
requestWrapper.setMethod("POST");
requestWrapper.setHeader( "SOAPAction", strReferenceToSoapActionValue );
requestWrapper.removeHeaders("Host");
requestWrapper.setHeader("Host", “...");
HttpResponse response = httpclient.execute(requestWrapper);
} catch (Exception e) { e.printStackTrace(); }
}

9. • XML-based Language for
Locating and Describing
Web Services

14. • JAX-WS é uma biblioteca de chamadas
remotas de procedimento (RPC), que
permite implementar serviços baseados
nas normas XSD, WSDL e SOAP

15. ...Definir o mapeamento de
WSDL para Java e vice-versa
... implementar Web Services partindo de
um contrato WSDL ou de código Java
...criar código cliente de
invocação de Web Services

16. Chamadas remotas de procedimento, passo-a-passo:

17. OBS: Definição do acordo WSDL entre cliente e servidor