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JSP learning 1

2022-04-23 16:06:00 【If you believe】 

<%@ page contentType="text/html; charset=UTF-8" pageEnconding="UTF-8" %>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
        <title> know jsp</title>
    </head>
    <body>
        1、<%--jsp notes --%>
         And html Notes <!----> difference : The front page can see html Notes , and jsp Your comments won't be seen 


        2、jsp Of Java Code block 
        <%--
         stay jsp Want to write in Java Code , And the execution needs to be written to 
            <%
            Java Code block 
            %>
         Must end with a semicolon , You cannot add an access control character when declaring variables （ Such as ：private）, Can't define method , Static code blocks cannot be defined 
        --%>
        <%
        String a=" handsome guy ";
        System.out.println(a);
        %>

        3、 Declaration block 
        <%-- 
        <%! Statement statement %>
         You can add access , You can define methods , You can define static code blocks 
        --%>
        <%!
        public void hu(){
    
            System.out.println("lllll");
        }
        %>
        <%
        hu();
        %>

        4、 Expression block 
        <%
        String a="kkk";
        %>
        <%=a%><%-- Plus the equal sign can be output directly --%>
    </body>
    
</html>

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