JSP语法(国外英文资料).docVIP

JSP语法(国外英文资料) JSP syntax (1) -- HTML comments HTML comments display an annotation on the client side. JSP syntax ! -- comment [ % = expression % ] Example 1 ! This file displays the user login screen Generate the same data in the HTML source code on the client side: ! This file displays the user login screen Example 2 ! This page was loaded on new java.util.date ()).tolocalestring () The HTML source code in the client side is shown as: ! -- This page was loaded on January 1, 2000 - - describe This comment is similar to HTML, which is what you can see in the view source. The only difference is that you can use expressions in this annotation (see example 2). This expression is indeterminate, its different from the page, you can use any expression, as long as its legal. (2) -- hidden comments Hide the comments Write in the JSP program, but not to the customer. JSP syntax % - comment - % Example: % @page language = Java % HTML head title A Comment Test / title / head The body h2 A Test of Comments / h2 This comment will not be visible in the page source The / body The / HTML describe Characters that are marked with hidden comments are ignored when the JSP is compiled. This comment is useful when you want to hide or annotate your JSP program. JSP compiler will not between % - and - % statement is compiled, it will not display in the client browser, also wont see in the source code between % -- -- % , you can write any comment statements, but cant use -- % , if you must use please use -- % \ . JSP syntax (3) - declarations Declare the valid variables and methods in the JSP program JSP syntax The %! Declaration; [declaration;] +... % example The %! Int I = 0; % The %! Int a, b, c; % The %! Circle a = new Circle (2.0); % describe Declare the variables and methods you will use in the JSP program. You must do the same, otherwise you will make a mistake. You can declare multiple variables and methods at once, just by saying ; At the end, of