Servlet
In short, a servlet is a piece of Java code that (usually) produces HTML output that gets displayed by a browser. Tomcat and Resin are popular implementations of Servlet engines.
Actually, any output can be generated: HTML, SVG, plain text, images, anything. In example, a servlet might perform a data base request and format the results as an HTML table.
Homepage: http://java.sun.com/products/servlet/
Book tip: Java Servlet Programmierung
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