August 2013
Intermediate to advanced
360 pages
10h 47m
English
Content preview from Java Web Services: Up and Running, 2nd EditionBecome 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. Web Services Quickstart
Although the term web service has various, imprecise, and evolving meanings, a working definition should be enough for the upcoming code example, which consists of a service and a client, also known as a consumer or requester. As the name suggests, a web service is a kind of webified application—an application typically delivered over HTTP (HyperText Transport Protocol). HTTPS (HTTP Secure) adds a security layer to HTTP; hence, a service delivered over HTTPS likewise counts as a web service. Until the main topic of interest is web service security, HTTP should be understood to include HTTPS.
Amazon, a pioneer in web services, is well known for its various websites, among which is the E-Commerce site for shopping. Amazon has other popular websites as well. Of interest here is that the data and functionality available at Amazon websites are likewise available as Amazon web services. For example, someone can use a browser to shop interactively at the Amazon E-Commerce site, but this person also could write a program, as later examples show, to do the shopping through the corresponding Amazon E-Commerce web service. Amazon is particularly good at pairing off its websites with web services.
Web services can be programmed in a variety of languages, old and new. The obvious way to publish a web service is with a web server; a web service client needs to execute on a machine that has network access, usually over HTTP, to the web server. In more technical ...
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