Java Platform, Enterprise Edition (Java EE) 8 The Java EE Tutorial |
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A servlet is a Java programming language class used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. Although servlets can respond to any type of request, they are commonly used to extend the applications hosted by web servers. For such applications, Java Servlet technology defines HTTP-specific servlet classes.
The javax.servlet
and javax.servlet.http
packages provide interfaces
and classes for writing servlets. All servlets must implement the
Servlet
interface, which defines lifecycle methods. When implementing
a generic service, you can use or extend the GenericServlet
class
provided with the Java Servlet API. The HttpServlet
class provides
methods, such as doGet
and doPost
, for handling HTTP-specific
services.
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