Detailed explanation of the steps and methods of creating JSP files-javaTutorial-php.cn

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
  <title>JSP Example</title>
</head>
<body>
  <h1 id="Hello-JSP">Hello, JSP!</h1>
</body>
</html>

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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.jsp in 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 id="The-sum-of-x-and-y-is-sum">The sum of x and y is <%= sum %></h1>

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6. Expressions in JSP

JSP files can be calculated using expressions Value, expression can be output using <%= %> tag, for example:

<h1 id="The-current-time-is-new-java-util-Date">The current time is <%= new java.util.Date() %></h1>

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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"/>

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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 id="Hello-user-getName">Hello, <%= user.getName() %>!</h1>

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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"/>

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10. Comments in JSP

JSP files can be commented using the  tag, for example:

<!-- This is a comment -->

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