Detailed explanation of the steps and methods of creating JSP files
Detailed explanation of the creation methods and steps of JSP files
1. Preparation
Before creating a JSP file, you need to ensure that the following software has been installed :
- Java Development Kit (JDK)
- Apache Tomcat Server
- Text Editor (such as Notepad, Notepad or Sublime Text)
2. Create a JSP file
- Open a text editor and create a new file.
- Save the file as .jsp, such as
index.jsp. - Enter the following code in the file:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <title>JSP Example</title> </head> <body> <h1>Hello, JSP!</h1> </body> </html>
3. Run the JSP file
- to start the Apache Tomcat server.
- Copy the JSP file to Tomcat's webapps directory.
- Enter
http://localhost:8080/index.jspin the browser.
4. Detailed explanation of JSP files
- <%@ page... %>: This is a JSP instruction, used to specify JSP The file's language, content type, and character encoding.
- : This is the HTML document type declaration.
<html>: This is the HTML root element.<head>: This is the HTML head element used to place metadata.<title>: This is the HTML title element used to specify the title of the web page.<body>: This is the HTML body element used to place the content of the web page.<h1>: This is an HTML first-level title element, used to display the title of the web page.
5. Java code in JSP
JSP files can contain Java code, which allows the JSP file to dynamically generate HTML code. Java code can be wrapped using <% %> tags, for example:
<% int x = 10; int y = 20; int sum = x + y; %> <h1>The sum of x and y is <%= sum %></h1>
6. Expressions in JSP
JSP files can be calculated using expressions Value, expression can be output using <%= %> tag, for example:
<h1>The current time is <%= new java.util.Date() %></h1>
7. Actions in JSP
JSP files can be executed using actions Certain operations and actions can be specified using <jsp:action ... %> tags, for example:
<jsp:forward page="login.jsp"/>
8. Tag library in JSP
JSP Files can use tag libraries to simplify code. Tag libraries can be specified using the <jsp:useBean ... %> and <jsp:setProperty ... %> tags. , for example:
<jsp:useBean id="user" class="com.example.User"/> <jsp:setProperty name="user" property="name" value="John Doe"/> <h1>Hello, <%= user.getName() %>!</h1>
9. Error handling in JSP
JSP files can use the <jsp:errorPage ... %> tag to specify the error page, for example ：
<jsp:errorPage page="error.jsp"/>
10. Comments in JSP
JSP files can be commented using the <!-- --> tag, for example:
<!-- This is a comment -->
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