Page instruction (page directive)

page Instruction (page directive)Properties of page directive:
(1) Language: Specifies the scripting language used in JSP pages;
(2) ContentType: Specifies the MIME type and character encoding used when server-side sends data to the browser end, the default value is "text/html;" Charset=iso-8859-1 ";
(3) Pageencoding: Specifies the character encoding of the JSP page itself;
(4) Import: importing Java classes;
(5) Session: Specifies whether the session object can be used, and the default value is true. If you set session= "false", the session object cannot be used in this JSP page;
(6) Buffer: Set the size of the Out object, the default value is 8KB (8192);
(7) AutoFlush: Sets whether to automatically refresh when the buffer fills up, and the default value is true. When the buffer fills up, if autoflush= "true", the buffer is automatically refreshed, and if autoflush= "false", an exception is generated. If buffer= "None", AutoFlush cannot be set to false;
(8) IsThreadSafe: Specifies whether the JSP page is thread safe and the default value is true. If isthreadsafe= "true", the JSP container is allowed to send concurrent requests to the JSP page, and if isthreadsafe= "false", the JSP container can send only one request at a time. Isthreadsafe= "False" is not recommended because it affects system performance; second, if the server uses the scenario shared by the instance, the specified IsThreadSafe is false or does not meet the purpose of prohibiting concurrent requests;
(9) Info: The content of info can be obtained by Servlet.getservletinfo () method;
(a) ErrorPage: Specifies the page to which the JSP page jumps when the error occurs;
(one) Iserrorpage: The default value is False, if you set iserrorpage= "true", you can use the exception object in this JSP page;
(a) Iselignored: Specifies whether El expressions in the JSP file are ignored, and if iselignored= "true", the El expression is ignored;
(extends): Specifies the parent class of the JSP page;