Presentation 15 SOAP on the Microsoft Platform (.NET)

Presentation 15

SOAP on the Microsoft Platform (.NET)

Ingeniørhøjskolen i ÅrhusSlide 2

Outline

• You have already been introduced to SOAP, WSDL & UDDI on the JAVA platform using AXIS

• Now we will take a look at the MS . NET platforms SOAP capabilities

• Luckily – SOAP & WSDL are well standardized – so we do not need to look at these again

• Instead we will:– Show the counterpart of the AXIS project in .NET - IIS– Show the alternatives to JAVA development – using the

tools from .NET framework & Microsoft Visual Studio .NET


Apache Tomcat vs. Microsoft Internet Information Server

• Apache Tomcat with AXIS & J2SE Java SDK– Works on:

• Windows, UNIX, LINUX• Open source Can be compiled to any platform (with some work)

– Server listening for events: • HTTP on port 80 (test http 8080 at startup)• Executes Servlets/JSP and JavaBeans

– AXIS is an embedded project within the Tomcat environment but works with most J2EE compliant AS

• Microsoft Internet Information Server with the .NET Framework SDK (ASP.NET)– Works on:

• Only Windows platforms (Windows NT, 2000, XP)– Server listening for events:

• HTTP on port 80 (optional)• Executes Web resources – ASP.NET, Web services, Web forms (resulting in client side HTML ), .NET code

– Tightly integrated with the Visual Studio .NET – for easy deployment & debugging

SOAP ClientJava, C++, C#,

Delphi, VB Application

SOAP over HTTP

Web ServerMS Internet Information Server

& the .NET Framework SDK(ASP.NET)

(vs. Apache Tomcat, with AXIS & J2SE SDK)

Web Forms

WebService

C++ unman.

Managedcode

Common code base – but only MS!


Web service enabling Windows

• You need to:– Install .NET Framework SDK

• Download from Microsoft (130 MB)• Comes standard with Visual Studio 2003 / 2005

– Install Internet Information Server• Enabled via the Control Panel• Remember to shut down after using!!!

– Visual Studio .NET• Already installed (versions 7,7.1, 8 and 9)

• More detailed instructions will follow for the LAB exercise


Not a Windows .NET course• You will NOT be required to be an expert on .NET• You will be required to be knowledgeable about it

• History:– Open source, Java, Linux the WWW threatened MS– Especially Java was gaining widespread support

amongst developers for its ease of use, productivity and heterogeneity

– The Empire Strikes back = the .NET Framework


Benefits of .NET

• Changes EVERYTHING– Takes all that was nice in Java and enhances it– End of DLL incompatibilities, DLL Hell, COM registry hell – Enter world of VM’s and Java like code (C#) including Garbage

collection – BUT with easy support for legacy unmanaged code (e.g. C++ for speed) and COM

– Performs much better than Java, and almost equivalent with Win32 C++ applications

– Still only support Microsoft operating systems BUT– .NET and C# is ECMA standard: Mono (www.go-mono.org) for

Linux is being developed– IIOP.NET (http://iiop-net.sourceforge.net/index.html) for CORBA

interop

http://www.go-mono.org/

http://iiop-net.sourceforge.net/index.html


The .NET Framework Components

Win32Win32

MessageMessageQueuingQueuing

COM+COM+(Transactions, Partitions, (Transactions, Partitions,

Object Pooling)Object Pooling)IISIIS WMIWMI

Common Language RuntimeCommon Language Runtime

.NET Framework Class Library.NET Framework Class Library

ADO.NET and XMLADO.NET and XML

XML Web ServicesXML Web Services User InterfaceUser Interface

VisualBasic C++ C# Perl JScript …

Application services. E.g. IIS, Message Queuing etc.

CLR:runtime execution environment. Equlas JVM of Java. Microsoft Intermediate Language (MSIL) equals Java ByteCode

A collection of class libraries (over 9000) wraps Win32 like Java API

ActiveX Data Objects

3 types of user interfaces: Web forms, Windows forms (Win32), Command Console

For inter-process communications

Any language conforming to the Common Language Specification (CLS) may be used.

Sourcecode Compiler

IntermediateLanguage

.NETFramework

Other ILlibraries

LinkerLinked

Program JIT-compilerExecutableProgram

JIT-compiler only runs first time!

Here we find the .NET Remoting libraries


Multiple Language Support• The .NET Framework is designed to support many

languages– More than 20 languages currently supported– Microsoft provides Visual Basic .NET, C#,

Visual J# .NET, and JScript .NET (backwards compatible with JScript) – others: Delphi (object pascal)

• Benefits of multiple-language support– Code modules are reusable– API access is the same for all languages– The right language is used for the right task– Performance is roughly equal between all languages

(which was not the case in ASP)


The Common Language Runtime

• One runtime for all . NET-Based Languages• Manages threads and memory

– Garbage collection• Enforces code security• Eliminates DLL versioning problems

– Multiple versions of a DLL can run simultaneously– Applications can specify a version of a DLL to use

• Reminds one of the Java Virtual Machine


Ressources for learning more

• Feel free to learn more about ASP.NET:– Getting started with the .NET framework– http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpcongettingstarte

dwithnetframework.asp

– Link can be found at the course site– Books on the subject

• Beginning .NET Web Services using C# by Joseph Bustos and Karli Watsom (WROK forlag)

• More will be listed on the course site

• Other relevant courses at IHA:– Windows programming (WIN1)– Komponent baseret udvikling (KPU1)

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpcongettingstartedwithnetframework.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpcongettingstartedwithnetframework.asp


Making the HelloWorld application

• Using Notepad !• Using Microsoft Visual Studio .NET• First:

– Install .NET Framework– Install IIS

• Then:– Produce code

• Manually for Notepad• Wizard for Visual Studio

– Deploy in the IIS folder • \inetpub\wwwroot\• As an .asmx file

– Test the Web service• Using the build-in functionality

– Write the Client – and all is well


C# Notepad HelloWorldName(missing): identifies localname of service

Namespace: the default namespace for the service Description: a purely

descriptive text information

WebService processing directive for the ASP.NET environment, e.g. class & language info

WebService Attribute, for configuration “behind the scenes” programming

WebMethod Attribute: indicates that the following method is to be exposed as a Web Service method (only public methods are allowed of course). Allowed properties: -BufferResponse, CacheDuration, Description, EnableSession, MessageName, TransactionOption

MUCH LIKE JWS DEPLOYMENT! Finally: simply store it i web folder


Using Visual Studio (managed C++)Wizards Available: for Managed C++ (see below example VB and C#

Code-behind: generates .asmx file and code behind (e.g. .cpp in C++ or .cs in C#)


Deploy & Test – access via browserIIS test : supports viewing WSDL & code testing via browser

WSDL: using ?WSDL

SOAP request & test: small test program generated


Developing the Client application

• Support for using Web services in a Visual Studio application

• Stubs are automatically compiled by Visual Studio using the “Add Web Reference” function OR

• You may simply use command line tools

Command line usage:

wsdl "http://localhost/hello.asmx" /out:hello.cs

This will produce the hello.cs file which must be compiled as a DLL (using the C# .NET SDK compiler)

csc hello.cs /t:library /out:hello.dll /r:System.Web.Service.dll /r:System.Xml.dll

See example at: http://www.csharpfriends.com/Articles/getArticle.aspx?articleID=35

http://www.csharpfriends.com/Articles/getArticle.aspx?articleID=35


New Application & Add Web Reference

Add Web Reference: Visual Studio support for generating a proxy using WSDL document


Discover & bind the Web serviceAdd Web Reference: Just enter the Web service endpoint address


Visual Studio produces a Proxy DLL

Performed by Visual Studio tool:a DLL is generated (Web Service Proxy Generator), and a header fileand a WSDL support document is madeavailable


Proxy class DLL

• DLL is generated by Visual Studio • The generated Proxy class derives from

System.Web.Service.Protocols.SoapHttpClientProtocol • It contains the following properties

– ClientCertificates allows clients to pass Authenticode X.509 v.3 certificates

– CookieContainer for handling state– Credentials for authentication purposes– PreAuthenticate saves the roundtrip by sending credentials first– Proxy use this property if you need to pass a proxy– Timeout default 100.000 milisseconds – may be set for infinite– Url from the location attribut of the service used


using System.Diagnostics;using System.Xml.Serialization;using System;using System.Web.Services.Protocols;using System.ComponentModel;using System.Web.Services;

/// <remarks/>[System.Diagnostics.DebuggerStepThroughAttribute()][System.ComponentModel.DesignerCategoryAttribute("code")][System.Web.Services.WebServiceBindingAttribute(Name="HelloWorldSoap", Namespace="http://www.wagner.dk/webservices")]public class HelloWorld : System.Web.Services.Protocols.SoapHttpClientProtocol { public HelloWorld() { this.Url = "http://192.168.1.100/hello.asmx"; } [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://www.wagner.dk/webservices/Hello", RequestNamespace="http://www.wagner.dk/webservices", ResponseNamespace="http://www.wagner.dk/webservices", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] public string Hello(string myName) { object[] results = this.Invoke("Hello", new object[] { myName}); return ((string)(results[0])); }

public System.IAsyncResult BeginHello(string myName, System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("Hello", new object[] { myName}, callback, asyncState); } public string EndHello(System.IAsyncResult asyncResult) { object[] results = this.EndInvoke(asyncResult); return ((string)(results[0])); }}

The Proxy code generated by theWSDL Proxy generator


Write the C++ code


Try it out

Not that much fun with command line … lets make a proper Windows solution


Piece of Cake – Now C#Add Web Reference: Again we use the Web service endpoint address with the “Add Web Reference” feature

We add a button, a text field and a label. Clicking the button gives access to the event handler “OnClick” of the button

Simple C# Windows Form Application:No point in producing another command line app


C# - coding the connection

Using the Proxy DLL: We recognize the connection between the WSDL, the DLL and the C# client code


Heterogeneous system C# to Java

Proxy DLL stubgenerated by VS

Proxy skeleton classgenerated by AXIS

// Hello World.Java

public class HelloWorld {

public HelloWorld() { } public String getHelloWorldMessage(String name) { return "Hello World to "+name; }}private void button1_Click(object sender,

System.EventArgs e){ localhost.HelloWorldService hello = new localhost.HelloWorldService(); textBox1.Text = hello.getHelloWorldMessage("Stefan");}

C# to Java Lets change it to our Axis Web service

Add Web Reference: We need to generate a new Proxy DLL

Other way around: and of course it also works the other way around

Proxy: if we are not using .JWS deployment, we need to generate the skeleton classes in AXIS as well


Try it with C++

• WARNING: In VS7 there seems to be a bug!– Problem with port 8080– Need to manually paste the

WSDL file and compile the proxy stub DLL

– This works fine in C#– No problem in VS7.1– Not tested with VS 8.0 / 9.0


NOT ONLY .NET

• You may use legacy C++ with ATL to create non .NET Web services & clients

• Producing a server:– http://msdn.microsoft.com/library/default.asp?url=/librar

y/en-us/vccore/html/vcconatlserverprovidingwebservices.asp

• Producing a client:– http://msdn.microsoft.com/library/default.asp?url=/librar

y/en-us/vccore/html/vcconATLServerCreatingWebServiceClients.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcconatlserverprovidingwebservices.asp



http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcconATLServerCreatingWebServiceClients.asp




Not Only VS IDE Support – Java as Well

IDE backed by SUN (free): Netbeans – has WS support



Ohter Java IDE’s with WS support

• Netbeans (SUN backed, free)• Eclipse(IBM backed, free)• JDeveloper (Oracle tool, free)• JBuilder (Borland, commercial)• IntelliJ-Idea (IntelliJ, commercial)• Others?

Documents

Presentation 15 SOAP on the Microsoft Platform (.NET)