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Understand the JSP syntax structure and let's explore it together!

王林

Jan 31, 2024 pm 09:19 PM

lspinclude page directives

Understand the JSP syntax structure and lets explore it together!

JSP syntax structure

JSP is a dynamic web page technology that allows web developers to embed Java code in HTML pages. JSP pages are executed on the server side and rendered as HTML pages on the client side.

The JSP syntax structure is similar to HTML syntax, but it contains some additional tags and instructions for embedding Java code in the page. These tags and instructions begin and end with and <code>%>.

JSP tag

JSP tag is used to execute Java code in the page. There are two types of JSP tags: standard tags and custom tags.

Standard tags

Standard tags are tags defined in the JSP specification. Standard tags include:

## and %>: used to execute Java code.
: used to output the value of Java expression in the page.
: Used to include another JSP page.
: Used to forward the request to another JSP page.
: Used to create or find JavaBeans.
: Used to set the properties of JavaBean.
: Used to obtain the properties of JavaBean.

Custom tags

Custom tags are tags defined by developers themselves. Custom tags can be used to encapsulate complex Java code and make JSP pages easier to read and maintain.

JSP directive

JSP directive is used to configure the JSP page. JSP directives start and end with

JSP instructions include:

: used to configure the properties of the JSP page, such as page encoding and content Type and buffer size.
: used to include another JSP page.
: used to import custom tag libraries.

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 Example</title>
</head>
<body>
<%
  int x = 10;
  int y = 20;
  int sum = x + y;
%>

<h1 id="Sum-of-x-and-y-is-sum">Sum of <%= x %> and <%= y %> is <%= sum %></h1>
</body>
</html>

When this JSP page is executed on the server side, it will Output the following HTML code:

<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>

<h1 id="Sum-of-and-is">Sum of 10 and 20 is 30</h1>

</body>
</html>

JSP advantages

JSP has the following advantages:

powerful functions.
Tightly integrated with the Java platform.
Cross-platform support.

JSP Disadvantages

JSP also has some disadvantages:

Security issues.
Difficult to debug.

JSP application scenarios

JSP is often used in the following scenarios:

Web application development.
E-commerce website development.
Content management system development.

JSP learning resources

The following are some JSP learning resources:

JSP Tutorial: https://www.tutorialspoint.com/jsp/
JSP Books:
- 《JSP and Servlets: A Developer's Handbook》
- 《JavaServer Pages》

Summary

JSP is a dynamic web page technology that allows web developers to embed Java code in HTML pages. JSP pages are executed on the server side and rendered as HTML pages on the client side. JSP syntax structure is similar to HTML syntax, but it contains some additional tags and instructions for embedding Java code in the page. JSP has the advantages of being easy to learn and use, powerful, tightly integrated with the Java platform, and cross-platform support. However, it also has disadvantages such as poor performance than static HTML pages, security issues, and difficulty in debugging. JSP is commonly used in dynamic web page development, Web application development, e-commerce website development, content management system development and other scenarios.

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