Java three ways to embed JSP

I. Expression tags <%=%>

Effect: 1. Evaluate the value of an expression <%=1+1%>

2. Display the value of an expression on the page

<%=pagecontext.getattribute ("ting")%>

Note that:<%=%> cannot have semicolons.

Two. Declaring an expression <%! %>

Function: Declare variables and functions that can be called by Java code. such as <%! String name= "Yvwenting"%>

Note: 1.<%! Semicolons can appear in%>

2. The declaration script can be placed at the bottom of the page, or can be placed above the page.

3. It is not recommended to declare a variable in a declaration script, which can lead to thread insecurity.

Three. General Script <%%>

Role: In addition to the inability to declare scripts, other Java code can be placed in script code, more used to declare variables and control process code.

Java three ways to embed JSP