The document describes how to create and consume a simple web service using ASP.NET and XML. It includes code to define a temperature conversion web service that exposes methods to convert between Fahrenheit and Celsius. The service utilizes SOAP, WSDL, and HTTP to allow other applications to remotely call its methods to perform temperature conversions in a standardized way.

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