A Java servlet is a platform independent web application component that is hosted in a JSP/servlet container. Servlets talk with a web client like in "internet explorer" by means of a request/response model managed by the JSP/servlet container.
There are 2 main java packages which make up the servlet architecture, javax.servlet and javax.servlet.http. The javax.servlet package containes generic interfaces and classes that are implemented and extended by all servlets. The second, javax.servlet.http package contains all servlet classes that are HTTP protocol specific. An example would be a simple servlet that responds using HTML.
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