GenericServlet Methods


public abstract class GenericServlet
extends java.lang.Object
implements Servlet, ServletConfig, java.io.Serializable

Defines a generic, protocol-independent servlet. To write an HTTP servlet for use on the Web, extend HttpServlet instead.

destroy

public void destroy()

Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. See Servlet.destroy().

Specified by

destroy in interface Servlet

getInitParameter

public java.lang.String getInitParameter(java.lang.String name)

Returns a String containing the value of the named initialization parameter, or null if the parameter does not exist.
This method is supplied for convenience. It gets the value of the named parameter from the servlet's ServletConfig object.

Specified by:

getInitParameter in interface ServletConfig

Parameters:

name - a String specifying the name of the initialization parameter

Returns:

String a String containing the value of the initialization parameter

getInitParameterNames

public java.util.Enumeration getInitParameterNames()

Returns the names of the servlet's initialization parameters as an Enumeration of String objects, or an empty Enumeration if the servlet has no initialization parameters.
This method is supplied for convenience. It gets the parameter names from the servlet's ServletConfig object.

Specified by:

getInitParameterNames in interface ServletConfig

Returns

Enumeration an enumeration of String objects containing the names of the servlet's initialization parameters

getServletConfig

public ServletConfig getServletConfig()
Returns this servlet's ServletConfig object.

Specified by:

getServletConfig in interface Servlet

Returns:

ServletConfig the ServletConfig object that initialized this servlet

getServletContext

public ServletContext getServletContext()

Returns a reference to the ServletContext in which this servlet is running.
This method is supplied for convenience. It gets the context from the servlet's ServletConfig object.

Specified by

getServletContext in interface ServletConfig

Returns:

ServletContext the ServletContext object passed to this servlet by the init method.

getServletInfo

public java.lang.String getServletInfo()

Returns information about the servlet, such as author, version, and copyright. By default, this method returns an empty string. Override this method to have it return a meaningful value.

Specified by:

getServletInfo in interface Servlet

Returns:

String information about this servlet, by default an empty string

init

public void init(ServletConfig config)


throws ServletException

Called by the servlet container to indicate to a servlet that the servlet is being placed into service.
This implementation stores the ServletConfig object it receives from the servlet container for later use. When overriding this form of the method, call super.init(config).

Specified by:

init in interface Servlet

Parameters

config - the ServletConfig object that contains configutation information for this servlet

Throws

ServletException - if an exception occurs that interrupts the servlet's normal operation

init

public void init()


throws ServletException
A convenience method which can be overridden so that there's no need to call super.init(config).
Instead of overriding init(ServletConfig), simply override this method and it will be called by GenericServlet.init(ServletConfig config). The ServletConfig object can still be retrieved via getServletConfig().

Throws:

ServletException - if an exception occurs that interrupts the servlet's normal operation

log

public void log(java.lang.String msg)

Writes the specified message to a servlet log file, prepended by the servlet's name. See ServletContext.log(String).

Parameters

msg - a String specifying the message to be written to the log file

log

public void log(java.lang.String message,
java.lang.Throwable t)

Writes an explanatory message and a stack trace for a given Throwable exception to the servlet log file, prepended by the servlet's name. See ServletContext.log(String, Throwable).

Parameters

message - a String that describes the error or exception
t - the java.lang.Throwable error or exception

References : tomcat.apache

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