Package org.apache.jasper.servlet
Class JspServlet
- java.lang.Object
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- jakarta.servlet.GenericServlet
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- jakarta.servlet.http.HttpServlet
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- org.apache.jasper.servlet.JspServlet
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- All Implemented Interfaces:
Servlet
,ServletConfig
,java.io.Serializable
,PeriodicEventListener
public class JspServlet extends HttpServlet implements PeriodicEventListener
The JSP engine (a.k.a Jasper). The servlet container is responsible for providing a URLClassLoader for the web application context Jasper is being used in. Jasper will try get the Tomcat ServletContext attribute for its ServletContext class loader, if that fails, it uses the parent class loader. In either case, it must be a URLClassLoader.- Author:
- Anil K. Vijendran, Harish Prabandham, Remy Maucherat, Kin-man Chung, Glenn Nielsen
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description JspServlet()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
destroy()
Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.int
getJspCount()
Returns the number of JSPs for which JspServletWrappers exist, i.e., the number of JSPs that have been loaded into the webapp with which this JspServlet is associated.int
getJspQueueLength()
Gets the number of JSPs that are in the JSP limiter queueint
getJspReloadCount()
Gets the number of JSPs that have been reloaded.int
getJspUnloadCount()
Gets the number of JSPs that have been unloaded.void
init(ServletConfig config)
Called by the servlet container to indicate to a servlet that the servlet is being placed into service.void
periodicEvent()
Execute a periodic task, such as reloading, etc.void
service(HttpServletRequest request, HttpServletResponse response)
Receives standard HTTP requests from the publicservice
method and dispatches them to thedo
Method methods defined in this class.void
setJspReloadCount(int count)
Resets the JSP reload counter.-
Methods inherited from class jakarta.servlet.http.HttpServlet
doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service
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Methods inherited from class jakarta.servlet.GenericServlet
getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log
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Method Detail
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init
public void init(ServletConfig config) throws ServletException
Description copied from class:jakarta.servlet.GenericServlet
Called by the servlet container to indicate to a servlet that the servlet is being placed into service. SeeServlet.init(jakarta.servlet.ServletConfig)
.This implementation stores the
ServletConfig
object it receives from the servlet container for later use. When overriding this form of the method, callsuper.init(config)
.- Specified by:
init
in interfaceServlet
- Overrides:
init
in classGenericServlet
- Parameters:
config
- theServletConfig
object that contains configuration information for this servlet- Throws:
ServletException
- if an exception occurs that interrupts the servlet's normal operation- See Also:
UnavailableException
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getJspCount
public int getJspCount()
Returns the number of JSPs for which JspServletWrappers exist, i.e., the number of JSPs that have been loaded into the webapp with which this JspServlet is associated.This info may be used for monitoring purposes.
- Returns:
- The number of JSPs that have been loaded into the webapp with which this JspServlet is associated
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setJspReloadCount
public void setJspReloadCount(int count)
Resets the JSP reload counter.- Parameters:
count
- Value to which to reset the JSP reload counter
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getJspReloadCount
public int getJspReloadCount()
Gets the number of JSPs that have been reloaded.This info may be used for monitoring purposes.
- Returns:
- The number of JSPs (in the webapp with which this JspServlet is associated) that have been reloaded
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getJspQueueLength
public int getJspQueueLength()
Gets the number of JSPs that are in the JSP limiter queueThis info may be used for monitoring purposes.
- Returns:
- The number of JSPs (in the webapp with which this JspServlet is associated) that are in the JSP limiter queue
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getJspUnloadCount
public int getJspUnloadCount()
Gets the number of JSPs that have been unloaded.This info may be used for monitoring purposes.
- Returns:
- The number of JSPs (in the webapp with which this JspServlet is associated) that have been unloaded
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service
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException
Description copied from class:jakarta.servlet.http.HttpServlet
Receives standard HTTP requests from the publicservice
method and dispatches them to thedo
Method methods defined in this class. This method is an HTTP-specific version of theServlet.service(jakarta.servlet.ServletRequest, jakarta.servlet.ServletResponse)
method. There's no need to override this method.- Overrides:
service
in classHttpServlet
- Parameters:
request
- theHttpServletRequest
object that contains the request the client made of the servletresponse
- theHttpServletResponse
object that contains the response the servlet returns to the client- Throws:
ServletException
- if the HTTP request cannot be handledjava.io.IOException
- if an input or output error occurs while the servlet is handling the HTTP request- See Also:
Servlet.service(jakarta.servlet.ServletRequest, jakarta.servlet.ServletResponse)
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destroy
public void destroy()
Description copied from class:jakarta.servlet.GenericServlet
Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. SeeServlet.destroy()
.- Specified by:
destroy
in interfaceServlet
- Overrides:
destroy
in classGenericServlet
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periodicEvent
public void periodicEvent()
Description copied from interface:PeriodicEventListener
Execute a periodic task, such as reloading, etc.- Specified by:
periodicEvent
in interfacePeriodicEventListener
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