Package jakarta.servlet.jsp.jstl.core

Class Config

java.lang.Object
jakarta.servlet.jsp.jstl.core.Config
public class Config extends Object
Class supporting access to configuration settings.

  • Field Details

    • FMT_LOCALE

      public static final String FMT_LOCALE
      Name of configuration setting for application- (as opposed to browser-) based preferred locale
      See Also:

    • FMT_FALLBACK_LOCALE

      public static final String FMT_FALLBACK_LOCALE
      Name of configuration setting for fallback locale
      See Also:

    • FMT_LOCALIZATION_CONTEXT

      public static final String FMT_LOCALIZATION_CONTEXT
      Name of configuration setting for i18n localization context
      See Also:

    • FMT_TIME_ZONE

      public static final String FMT_TIME_ZONE
      Name of localization setting for time zone
      See Also:

    • SQL_DATA_SOURCE

      public static final String SQL_DATA_SOURCE
      Name of configuration setting for SQL data source
      See Also:

    • SQL_MAX_ROWS

      public static final String SQL_MAX_ROWS
      Name of configuration setting for maximum number of rows to be included in SQL query result
      See Also:

  • Constructor Details

    • Config

      public Config()

  • Method Details

    • get

      public static Object get(PageContext pageContext, String name, int scope)
      Looks up a configuration variable in the given scope.

      The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      pageContext - Page context in which the configuration variable is to be looked up
      name - Configuration variable name
      scope - Scope in which the configuration variable is to be looked up
      Returns:
      The java.lang.Object associated with the configuration variable, or null if it is not defined.

    • get

      public static Object get(ServletRequest request, String name)
      Looks up a configuration variable in the "request" scope.

      The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      request - Request object in which the configuration variable is to be looked up
      name - Configuration variable name
      Returns:
      The java.lang.Object associated with the configuration variable, or null if it is not defined.

    • get

      public static Object get(HttpSession session, String name)
      Looks up a configuration variable in the "session" scope.

      The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      session - Session object in which the configuration variable is to be looked up
      name - Configuration variable name
      Returns:
      The java.lang.Object associated with the configuration variable, or null if it is not defined, if session is null, or if the session is invalidated.

    • get

      public static Object get(ServletContext context, String name)
      Looks up a configuration variable in the "application" scope.

      The lookup of configuration variables is performed as if each scope had its own name space, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      context - Servlet context in which the configuration variable is to be looked up
      name - Configuration variable name
      Returns:
      The java.lang.Object associated with the configuration variable, or null if it is not defined.

    • set

      public static void set(PageContext pageContext, String name, Object value, int scope)
      Sets the value of a configuration variable in the given scope.

      Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      pageContext - Page context in which the configuration variable is to be set
      name - Configuration variable name
      value - Configuration variable value
      scope - Scope in which the configuration variable is to be set

    • set

      public static void set(ServletRequest request, String name, Object value)
      Sets the value of a configuration variable in the "request" scope.

      Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      request - Request object in which the configuration variable is to be set
      name - Configuration variable name
      value - Configuration variable value

    • set

      public static void set(HttpSession session, String name, Object value)
      Sets the value of a configuration variable in the "session" scope.

      Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      session - Session object in which the configuration variable is to be set
      name - Configuration variable name
      value - Configuration variable value

    • set

      public static void set(ServletContext context, String name, Object value)
      Sets the value of a configuration variable in the "application" scope.

      Setting the value of a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not replace one stored in a different scope.

      Parameters:
      context - Servlet context in which the configuration variable is to be set
      name - Configuration variable name
      value - Configuration variable value

    • remove

      public static void remove(PageContext pageContext, String name, int scope)
      Removes a configuration variable from the given scope.

      Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

      Parameters:
      pageContext - Page context from which the configuration variable is to be removed
      name - Configuration variable name
      scope - Scope from which the configuration variable is to be removed

    • remove

      public static void remove(ServletRequest request, String name)
      Removes a configuration variable from the "request" scope.

      Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

      Parameters:
      request - Request object from which the configuration variable is to be removed
      name - Configuration variable name

    • remove

      public static void remove(HttpSession session, String name)
      Removes a configuration variable from the "session" scope.

      Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

      Parameters:
      session - Session object from which the configuration variable is to be removed
      name - Configuration variable name

    • remove

      public static void remove(ServletContext context, String name)
      Removes a configuration variable from the "application" scope.

      Removing a configuration variable is performed as if each scope had its own namespace, that is, the same configuration variable name in one scope does not impact one stored in a different scope.

      Parameters:
      context - Servlet context from which the configuration variable is to be removed
      name - Configuration variable name

    • find

      public static Object find(PageContext pageContext, String name)
      Finds the value associated with a specific configuration setting identified by its context initialization parameter name.

      For each of the JSP scopes (page, request, session, application), get the value of the configuration variable identified by name using method get(). Return as soon as a non-null value is found. If no value is found, get the value of the context initialization parameter identified by name.

      Parameters:
      pageContext - Page context in which the configuration setting is to be searched
      name - Context initialization parameter name of the configuration setting
      Returns:
      The java.lang.Object associated with the configuration setting identified by name, or null if it is not defined.