JSP Dynamic Web Development Foundation

1. What is a Dynamic Web page?

An interactive Web page that is designed for use in a program language that is run on the server.

2. What are the advantages of dynamic Web pages?

Interactivity: The Web page dynamically changes and displays content based on the user's requirements and choices.

Automatic Update: That is, without changing the page code, will automatically generate new page content, can greatly save effort.

Randomness: This results in different page effects when different people visit the same URL at different times.

3. What is a URL?

A Uniform Resource locator that is used to describe an identity method that describes the addresses of Web pages and other resources on the Internet.

Function: An address identification method that can be defined by the same access method in order for the client program to query different information resources.

The composition of the 4.URL?

(1) Protocol: HTTP protocol, Hypertext Transfer Protocol

(2) Server domain name or IP

(3) Port number

(4) path

5.JSP page composition

(1) Static content

Static text in a JSP page, which is basically HTML text, regardless of the Java and JSP syntax.

(2) JSP directive element

Function: Controls some characteristics of a JSP page while the JSP is running by setting properties in the directive.

"<%" begins, ends with "%>"

Page directive: a directive that is set for the current page

Syntax: <%@ page Property 1 = "Property Value" Property 2 = "Property value 1, property value 2" .... Property N= "Property value"%>

Note: The same property sets multiple attribute values separated by commas.

Common Properties:

Language: Specifies the scripting language used by the JSP page, which defaults to "Java"

Import: This property refers to the class file used in the scripting language.

Contenttye: The character encoding used to specify the MIME type and the JSP page response, which defaults to "Text/html;charset=iso-8859-1".

(3) JSP scripting elements

Little Textbook <%java%>

An expression <%=java a variable or expression%>

Statement <%! %>

Comment: JSP comment <%//single line comment%>, <%/* Multiline Comment */%>

The 6.web container handles three stages of a JSP file:

(1) Translation phase: Translating a well-written JSP file into an identifiable Java source code through a JSP container

(2) Compile stage: Compile Java source files into executable bytecode files

(3) Execution phase: Execute and generate return results page

JSP Dynamic Web Development Foundation