February 2009
Intermediate to advanced
316 pages
9h 28m
English
Content preview from Java Web Services: Up and RunningBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 1. Java Web Services Quickstart
What Are Web Services?
Although the term web service has various, imprecise, and evolving meanings, a glance at some features typical of web services will be enough to get us into coding a web service and a client, also known as a consumer or requester. As the name suggests, a web service is a kind of webified application, that is, an application typically delivered over HTTP (Hyper Text Transport Protocol). A web service is thus a distributed application whose components can be deployed and executed on distinct devices. For instance, a stock-picking web service might consist of several code components, each hosted on a separate business-grade server, and the web service might be consumed on PCs, handhelds, and other devices.
Web services can be divided roughly into two groups, SOAP-based and REST-style. The distinction is not sharp because, as a code example later illustrates, a SOAP-based service delivered over HTTP is a special case of a REST-style service. SOAP originally stood for Simple Object Access Protocol but, by serendipity, now may stand for Service Oriented Architecture (SOA) Protocol. Deconstructing SOA is nontrivial but one point is indisputable: whatever SOA may be, web services play a central role in the SOA approach to software design and development. (This is written with tongue only partly in cheek. SOAP is officially no longer an acronym, and SOAP and SOA can live apart from one another.) For now, SOAP is just an XML (EXtensible ...
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