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Class Acme.Serve.servlet.GenericServlet

java.lang.Object
   |
   +----Acme.Serve.servlet.GenericServlet

public abstract class GenericServlet

extends Object

implements Servlet

This is an abstract object that implements the Servlet interface. Servlet has to be an interface so that things that must inherit from another object, such as RMI, can also be Servlets. However, most of the time a Servlet will not need to be anything else, and it will be somewhat more convenient to extend this class and just provide the service() routine.

This is taken from JavaSoft's Servlet API documentation.

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See Also:

Servlet

GenericServlet()

destroy()

Destroys the servlet and cleans up whatever resources are being held.

getInitParameter(String)

Gets an initialization parameter of the servlet.

getInitParameterNames()

Gets a hash table of the initialization parameters of the servlet.

getServletConfig()

Returns a servlet config object, which contains any initialization parameters and startup configuration for this servlet.

getServletContext()

Returns the servlet context.

getServletInfo()

Returns a string containing information about the author, version, and copyright of the servlet.

init()

Initializes the servlet.

init(ServletConfig)

Initializes the servlet.

log(String)

Write information to the servlet log.

service(ServletRequest, ServletResponse)

Services a single request from the client.

 public GenericServlet()

 public String getServletInfo()

Returns a string containing information about the author, version, and copyright of the servlet.

 public void init() throws ServletException

Initializes the servlet. This is called by the system when the servlet is first loaded.

Throws: ServletException

when an exception has occurred

 public abstract void service(ServletRequest req,
                              ServletResponse res) throws ServletException, IOException

Services a single request from the client.

Note that the server only creates a single instance of your Servlet subclass, and calls the service() method of that one instance multiple times, possibly at the same time in different threads. This is somewhat unusual in the Java world. The implication is that any instance variables in your class behave more like class variables - they are shared among multiple concurrent calls. So, be careful.

Parameters:

req - the servlet request

req - the servlet response

Throws: ServletException

when a servlet exception has occurred

Throws: IOException

when an I/O exception has occurred

 public void destroy()

Destroys the servlet and cleans up whatever resources are being held. This is called by the system when the servlet is being destroyed.

 public void init(ServletConfig config) throws ServletException

Initializes the servlet. This is called by the system when the servlet is first loaded.

Parameters:

config - servlet initialization information

Throws: ServletException

when an exception has occurred

 public ServletConfig getServletConfig()

Returns a servlet config object, which contains any initialization parameters and startup configuration for this servlet.

 public void log(String message)

Write information to the servlet log.

Parameters:

message - the message to log

 public ServletContext getServletContext()

Returns the servlet context. The servlet context lets a servlet access the environment of the server in which it is running.

 public String getInitParameter(String name)

Gets an initialization parameter of the servlet.

Parameters:

name - the parameter name

 public Enumeration getInitParameterNames()

Gets a hash table of the initialization parameters of the servlet.

Parameters:

name - the parameter name

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