JSP Directives provide instructions to the JSP container to generate the servlets responsible for processing the JSP file. Understanding the different types of JSP directives is important for building high-quality Java Server pages (JSP) applications.
Table of Contents
JSP Directive Types
Page Directive The page directive provides instructions for the entire JSP page.
Include Directive The include directive is used to include static or dynamic content into a JSP page.
Taglib Directive The taglib directive is used to declare and define custom tags for use in the JSP file.
Page Directive
The page directive is used to specify page-specific information, such as import statements and error pages.
<%@ page import="com.example.MyClass" %>
<html>
<head>
<title>My JSP Page</title>
</head>
<body>
<%
MyClass myObject = new MyClass();
out.println(myObject.myMethod());
%>
</body>
</html>
Include Directive
The include directive is used to include static or dynamic content into a JSP page.
<html>
<head>
<title>My JSP Page</title>
</head>
<body>
<%-- include the header.jsp file --%>
<jsp:include page="header.jsp" />
<p>This is the body of my JSP page.</p>
</body>
</html>
Taglib Directive
The taglib directive is used to declare and define custom tags for use in the JSP file.
<%@ taglib uri="http://example.com/mytags" prefix="my" %>
<html>
<head>
<title>Using Custom Tag Libraries</title>
</head>
<body>
<h1>My Custom Tags</h1>
<my:hello />
</body>
</html>
Conclusion
Understanding the different types of JSP directives is important for building high-quality JSP applications. Proper use of JSP directives can optimize the processing of JSP files and enable the use of custom tags.
