The server-side program receives the query parameters, queries the database based on these parameters, and returns the query result to the client-side program.The client-side program sends the query parameters to a server-side program.The user fills up the query criteria inside the form and submits the form.The HTTP server returns an HTML form (client-side program), which is loaded into the client’s browser.A user, via a web browser (HTTP client), issues a URL request to an HTTP server to start a webapp.Server-Side Programs: could be written in Java Servlet/JSP, ASP, PHP, Perl, Python, CGI, and others.Client-Side Programs: could be written in HTML Form, JavaScript, VBScript, Flash, and others.Database: E.g., Open-source MySQL, Apache Derby, mSQL, SQLite, PostgreSQL, OpenOffice’s Base Commercial Oracle, IBM DB2, SAP SyBase, MS SQL Server, MS Access and others.HTTP Client (or Web Browser): E.g., Internet Explorer (MSIE), FireFox, Chrome, Safari, and others.HTTP Server: E.g., Apache HTTP Server, Apache Tomcat Server, Microsoft Internet Information Server (IIS), nginx, Google Web Server (GWS), and others.Examples of webapps are google, amazon, ebay, facebook and twitter.Ī webapp is typically a 3-tier (or multi-tier) client-server database application run over the Internet as illustrated in the diagram below. IntroductionĪ web application (or webapp), unlike standalone application, runs over the Internet. You can check your JDK version via command “javac -version”. If your JDK is below 1.7, upgrade it (See JDK How-To). Take note that Tomcat 8 requires JDK 1.7. This installation and configuration guide is applicable to Tomcat 7 and 8, and possibly the earlier versions. This practical can be completed in a 3-hour session. How to Install Apache Tomcat 8 (on Windows, Mac OS, Ubuntu) and Get Started with Java Servlet Programming
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