01_01 JSP Basic syntax

JSP Basic Syntax

First, comments

1. Explicit annotations, client-visible

<!-- Comment -

2. implicit annotation, client not visible

// Comment Line

/* Comment Multiple lines * /

<%--jsp Comment -

Second, Scriptlet

1. the first type of scriptlet: <%%>

Can be used to define local variables , write statements, etc.

<% int x = 10;    String info = "www.126.com";    Out.println ("
2. the second type of scriptlet: <%!%>
You can define global variables, methods, classes
<%!    public static finalString INFO =  "Www.126.com";     int x = 10;%><%!    public int add (int  x,int y) {        return x+y;    }% ><%!    class person{        private  Stringname;        private int age;         publicperson (string name, int age) {         this.name = name;        this.age =  age;        }         Public stringtostring () {        return "name="  +  this.name + ";  age=" &Nbsp;+ this.age;        }    }%><%     out.println ("
3. the third type of scriptlet: <%=%>, also known as an expression output
The main function is to output a variable or a specific constant
<% String info = "www.126.com"; int temp = 30;%><%--uses an expression to output variables and constants--%>
Output is typically output with an expression without out.println ()
Example 1:
Example 2 slightly
Third, Scriptlet label
Provide <jsp:script></jsp:script>, same as <%%> function
<jsp:script>
Java Scriptelet Code
</jsp:scipt>


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01_01 JSP Basic syntax