Understand the JSP syntax structure and let's explore it together!
- 王林Original
- 2024-01-31 21:19:071073browse
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>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>Sum of 10 and 20 is 30</h1> </body> </html>
JSP advantages
JSP has the following advantages:- Easy to learn and use.
- powerful functions.
- Tightly integrated with the Java platform.
- Cross-platform support.
JSP Disadvantages
JSP also has some disadvantages:- Performance is not as good as static HTML pages.
- Security issues.
- Difficult to debug.
JSP application scenarios
JSP is often used in the following scenarios:- Dynamic web development.
- Web application development.
- E-commerce website development.
- Content management system development.
JSP learning resources
The following are some JSP learning resources:- JSP official documentation: https://docs. oracle.com/javaee/6/jsp/
- JSP Tutorial: https://www.tutorialspoint.com/jsp/
- JSP Books:
- 《Head First JSP & Servlets》
- 《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.The above is the detailed content of Understand the JSP syntax structure and let's explore it together!. For more information, please follow other related articles on the PHP Chinese website!