Explore JSP syntax structure: understand its essence!
JSP (JavaServer Pages) is a dynamic web page technology based on Java technology, which allows programmers to embed Java code in HTML pages to create dynamic and interactive web pages. The JSP syntax structure is simple and easy to learn, but it is powerful and can meet various complex web development needs.
Overview of JSP syntax structure
JSP syntax structure mainly includes the following parts:
-
Directives: Directives are used to specify Various configuration information of JSP pages, such as page encoding, content type, imported class libraries, etc. The command starts with
and ends with <code>%>. -
Expressions: Expressions are used to embed Java code in JSP pages, so that HTML content can be dynamically generated. The expression starts with
and ends with <code>%>. -
Scripts: Scripts are used to write Java code in JSP pages, so that more complex business logic can be implemented. The script starts with
<script></script>and ends with. -
Actions: Actions are used to perform specific operations in JSP pages, such as forwarding requests, including other pages, etc. The action starts with
<jsp:> and ends with <code>/>. -
Comments : Comments are used to add comments to JSP pages to make it easier for programmers to understand the code. Comments start with
and end with <code>--%>.
JSP code example
The following is a simple JSP code example:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>JSP示例</title>
</head>
<body>
<h1 id="JSP示例">JSP示例</h1>
<%
// 输出当前时间
out.println("当前时间：" + new Date());
%>
</body>
</html>This code first uses directive specifies the encoding, content type and other information of the page. Then use the expression in the tag to output the current time. Finally, use the and
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