The code segment in jsp is also called the script segment. The script segment is a JSP code snippet or script snippet, embedded in the "" tag. In the script segment, you can define variables, call methods and perform various expression operations. Add a semicolon after each line of statements (because the Java code embedded in is no different from our ordinary Java code. This is expression is different).
Use JSP script elements to embed Java code into the JSP page. These Java codes will appear in the Servlet generated by the current JSP page, allowing JSP to separate static content from dynamic content. This Java code is run when the web server responds to a request. Surrounding the script segments can be raw HTML or XML statements, where the snippet can create conditional execution of code, or call another piece of code.
The script segment uses the following format:
<% Java代码 %>
For example:
<%@ page language="java" contentType="text/html;charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%!
//int number =0;//声明计数变量number
%>
<%
//this.add();//该脚本程序调用定义的计数方法
int number =0;//声明计数变量number
%>
本网页的访问次数是：<%=++number %>次。
</body>
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