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public void service( ServletRequest req, ServletResponse res) throws ServletException, IOException
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getInitParameterNames
public Enumeration getInitParameterNames()
Returns an enumeration of the names of the servlet s initialization parameters, or an empty enumeration if none exist
APPENDIXES
getServletContext
public ServletContext getServletContext()
Returns the ServletContext associated with the servlet
JSP: The Complete Reference
getServletName
public String getServletName()
Returns the name of the servlet instance as recorded in the webxml deployment descriptor
ServletContext
Full Name: Type: javaxservletServletContext Interface
Defines the list of methods that are available to a servlet for communicating with its servlet container The servlet context can store attributes that are available to all servlets in the application
Methods
getAttribute
public Object getAttribute(String name)
Returns the application-level attribute with the specified name, or null if it does not exist The object must be cast into the appropriate type
getAttributeNames
public Enumeration getAttributeNames()
Returns an enumeration of the attribute names in the servlet context
getContext
public ServletContext getContext(String uripath)
Returns the ServletContext object of another URL on the same server The path must begin with "/" and will be interpreted as being relative to the Web server s document root
Appendix A:
Servlet API Version 23
getInitParameter
public String getInitParameter(String name)
Returns the specified initialization parameter:
getInitParameterNames
public Enumeration getInitParameterNames()
Returns an enumeration of the names of the servlet context s initialization parameters, or an empty enumeration if there are none
getMajorVersion
public int getMajorVersion()
Returns the integer to the left of the decimal point in the Servlet API version number
getMimeType
public String getMimeType(String file)
Returns the MIME type of the specified file, or null if the MIME type is not known
getMinorVersion
public int getMinorVersion()
Returns the number to the right of the decimal place in the Servlet API version number
getNamedDispatcher
public RequestDispatcher getNamedDispatcher(String name) APPENDIXES
Returns a RequestDispatcher for the specified servlet, or null if the RequestDispatcher cannot be returned
getRealPath
public String getRealPath(String path)
JSP: The Complete Reference
Given a URI path in the current servlet context, converts the path into the absolute file name to which it refers
getRequestDispatcher
public RequestDispatcher getRequestDispatcher(String path)
Returns a RequestDispatcher for the specified resource, or null if it cannot be created The path name must begin with "/" and is interpreted as being relative to the root of the servlet context
getResource
public URL getResource(String path) throws MalformedURLException
Returns a URL for the specified resource, or null if it cannot be created The path name must begin with "/" and is interpreted as being relative to the root of the servlet context
getResourceAsStream
public InputStream getResourceAsStream(String path)
Returns an InputStream for the specified resource, or null if it cannot be created The path name must begin with "/" and is interpreted as being relative to the root of the servlet context
getResourcePaths
public Set getResourcePaths()
Returns a Set of strings representing the paths to resources held in the web application The paths begin with a leading /, and are relative to the root of the servlet context
getServerInfo
public String getServerInfo()
Returns the name and version of the servlet engine The returned value is in the form servername/version_number
Appendix A:
Servlet API Version 23
[deprecated] getServlet
public Servlet getServlet(String name) throws ServletException
No longer supported, for security reasons See HttpSessionListener for an alternative approach
getServletContextName
public String getServletContextName()
Returns the name of the Web application, corresponding to the display-name element for this ServletContext in the webxml deployment descriptor
[deprecated] getServletNames
public Enumeration getServletNames()
No longer supported, for security reasons See HttpSessionListener for an alternative approach
[deprecated] getServlets
public Enumeration getServlets()
[deprecated] log
public void log(Exception exception, String msg)
No longer supported Use log(String message, Throwable t) instead
public void log(String msg) APPENDIXES
Writes the specified message to the servlet log
public void log(String message, Throwable throwable)
JSP: The Complete Reference
Writes the specified message and a stack trace for a given Throwable to the servlet log
removeAttribute
public void removeAttribute(String name)
Removes the attribute with the specified name from the servlet context
setAttribute
public void setAttribute(String name, Object object)
Stores an object under the specified attribute name in this servlet context
ServletContextAttributeEvent
Full Name: Type: Extends: javaxservletServletContextAttributeEvent Class javaxservletServletContextEvent
Used for notifications about changes to the attributes of the servlet context of a web application
Constructors
ServletContextAttributeEvent
public ServletContextAttributeEvent( ServletContext source, String name, Object value)
Constructs a ServletContextAttributeEvent from the specified context for the specified name and value
Methods
getName
public String getName()
Appendix A:
Servlet API Version 23
Returns the name of the attribute that changed
getValue
public Object getValue()
Returns the value of the attribute that was added removed or replaced The value depends on whether the attribute was added, changed, or deleted For changes or deletions, it is the value of the old attribute For additions, it is the value of the new attribute
ServletContextAttributesListener
Full Name: Type: Superinterface: javaxservletServletContextAttributesListener Interface javautilEventListener
Classes implementing this interface will receive notification of changes to the servlet context s attribute list
Methods
attributeAdded
public void attributeAdded(ServletContextAttributeEvent scab)
Called when a new attribute is added to the servlet context
attributeRemoved
public void attributeRemoved (ServletContextAttributeEvent scab)
Called when an existing attribute is removed from the servlet context
APPENDIXES
attributeReplaced
public void attributeReplaced (ServletContextAttributeEvent scab)
Called when an existing attribute is replaced in the servlet context
JSP: The Complete Reference
ServletContextEvent
Full Name: Type: Extends: javaxservletServletContextEvent Class javautilEventObject
Event class for notifications about changes to the servlet context
Constructors
ServletContextEvent
public ServletContextEvent(ServletContext source)
Creates a ServletContextEvent from the given context
Methods
getServletContext
public ServletContext getServletContext()
Returns the ServletContext that changed
ServletContextListener
Full Name: Type: Superinterface: javaxservletServletContextListener Interface javautilEventListener
Classes implementing this interface will receive notification about changes to the servlet context
Methods
contextDestroyed
public void contextDestroyed(ServletContextEvent sce)
Called when the servlet context is about to be shut down
Appendix A:
Servlet API Version 23
contextInitialized
public void contextInitialized(ServletContextEvent sce)
Called when the Web application is ready to process requests
ServletException
Full Name: Type: Extends: javaxservletServletException Class javalangException
A generic servlet exception
Constructors
ServletException
public ServletException()
Creates a new servlet exception
ServletException
public ServletException(String message)
Creates a new servlet exception with the specified message
ServletException
public ServletException(String message, Throwable rootCause)
Creates a new servlet exception that includes a message and the root cause exception
APPENDIXES
ServletException
public ServletException(Throwable rootCause)
Creates a new servlet exception that includes the root cause exception
JSP: The Complete Reference
Methods
getRootCause
public Throwable getRootCause()
Returns the root cause exception for the current servlet exception
ServletInputStream
Full Name: Type: Extends: javaxservletServletInputStream Abstract class javaioInputStream
An input stream a servlet can use for reading binary data from a client request Typically retrieved with the ServletRequestgetInputStream() method
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