Developing Web Services with

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Nov 3, 2013 (3 years and 5 months ago)

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Developing Web Services with
the Eclipse Web Tools Platform

David Gallardo

My books


Java Oracle Database Development


Eclipse in Action, (lead author)


Eclipse in Action, 2
nd

edition due out in December








Preview article, Introducing the Eclipse Visual Editor
available at:



http://www.manning.com/books/gallardo2

This presentation available at:

http://www.gallardo.org

What are Web Services?


Extend the WWW from “The Web for
eyeballs” to “The Web for programs”


Move from Business2User to
Business2Business


Language/platform neutral remote
procedure calls built on HTTP infrastructure

Locating a web service

Locating a web service

Publish WSDL

Locating a web service

Query for service

Locating a web service

Obtain WSDL

Using a web service

Call web service operation

Using a web service

Receive result

Web services alphabet soup

Fundamental standards and
technologies


XML


eXtensible Markup Language: The syntax
used for Web Service messages, configuration
files, description files, etc.


HTTP


Hypertext Transfer Protocol: The
standard transport used to communicate between
Web Service servers and clients


RPC


Remote Procedure Call: The technique of
executing a method call remotely

here, the client
calling a web service’s operation.

Web Service standards and
technologies


SOAP


Simple Object Access Protocol. An
XML
-
based standard for sending messages (in a
SOAP envelope) between web services and
clients.


WSDL

Web Service Definition Language XML
-
based description of a web services public
interface. (Similar to CORBA IDL.)


UDDI

Universal Description, Discovery and
Integration. And XML
-
based registry for web
service. Interrogated with SOAP messages, returns
WSDL documents.

Eclipse Web Services Platform


Provides tools for:


Web applications using JSP/servlets


EJB


Web Service (based on Apache AXIS)


Database exploration


Java Web Service related
protocols


JAXP

Java API for XML Processing


JAX
-
RPC

Java API for XML
-
based RPC


JAXR

Java API for XML registries


SAAJ

SOAP with Attachments API for
Java


SAX

Simple API for XML processing


DOM API

Document Object Model API



The rest


We won’t worry about these for now:

DIME

Direct Internet Message Encapsulation

HTTPR

Reliable HTTP

WSCL

Web Services Conversation Language

WSCM

Web Services Component Model

WSEL

Web Services Endpoint Language

WSFL

Web Services Flow Language

WSML

Web Services Meta Language

WSXL
-
Web Services Experience Language

WSUI

Web Services User Interface

XLANG

Web Services for Business Process Design

USML

UDDI Search Markup Language

Eclipse WTP tools for
developing a Web Service


Top down:


You write the WSDL


Eclipse creates the necessary glue classes and
the service’s method stubs in a Java Bean


You implement the operations


Bottom up:


You create the web service Java Bean


Eclipse creates the glue classes and the WSDL

Demo


Install WTP from Eclipse.org update site.


Create a web service, bottom
-
up


Exploring a Web Service using the Web Services
Explorer (ideally http://www.xmethods.com, but
here we’ll just use the service we created.)


Creating a web client for the GoogleAPI web
service with WTP.


Writing our own client.