BuildingWebApplicationsWithTheStrutsFrameworkCraig.ppt

Building Web Applications With The Struts FrameworkCraig McClanahanAmy RohSlides: /~craigmccO’Reilly Open Source ConventionJuly 7 - 11, 2003 Tutorial Outline Technology Backgrounder Introduction To Struts Our First Struts Application Web Application Architecture Decisions A More Advanced Struts Application Struts and Emerging Technologies Information Resources TechnologyBackgrounder Technology Backgrounder Struts is based on a host of foundational technologies It behooves web application developers to be familiar with the basic characteristics of these technolgoies World Wide Web (WWW) Standards: HTTP, HTML, JavaScript Java API Standards: Servlet, JavaServer Pages (JSP) Technology Backgrounder: HTTP Hypertext Transfer Protocol (HTTP) is the fundamental communications protocol of the World Wide Web Simple to implement (client and server) Request/response oriented Stateless (no client identity across requests) HTTP/1.0 – TCP connection per request HTTP/1.1 – Supports persistent connections, for better throughput Technology Backgrounder: HTTP So, what really happens when you type a URL like http://localhost:8080/index.html into your browsers location bar? Your browser sends the following text, with CR/LF at the end of each line (signified by the ? symbol): GET /index.html HTTP/1.1? Host: localhost:8080? If-Modified-Since: (cache-timestamp)? User-Agent: (browser-id-string)? ? Technology Backgrounder: HTTP And the server returns something like this: HTTP/1.1 200 OK? Last-Modified: Fri, 30 May 2003 12:56:38 GMT? Content-Type: text/html? Content-Length: xxx? Server: Apache-Coyote/1.1? ? html head titleWelcome To My Web Site/title /head ... Technology Backgrounder: HTTP Does the “.html” extension mean that this response was from a static HTML page? Only your server knows for sure :-) How do redirects work? HTTP/1.1 302 Temporary Redirect? Location: http://foo.bar/baz.html? What about BASIC authentication? HTTP/1.1 401 Not Authorized