JSP Components Declaratives Scriptlets Expressions
JSP Components -
JSP has mainly six type of components.
1.JSP Declaratives
2.JSP Scriptlets
3.JSP Expressions
4.Directives
5.Implicit Objects
6.Standard Actions
JSP Declaratives -
JSP Declaratives is used for embed Java code in class label. Any code which is written in JSP Declaratives will goes to scope of a class of servlet. JSP Declaratives is open with <%! and closed with %> syntax.
If any variable is made in JSP Declaratives means this variable will be available for any where with in JSP.
Example -
<HTML>
<HEAD>
<BODY>
<%!
public int getSum(int a, int b){
return a+b;
}
%>
</BODY>
</HTML>
Servlet of this JSP will be -
package org.apache.jsp;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
public final class test_jsp extends org.apache.jasper.runtime.HttpJspBase
implements org.apache.jasper.runtime.JspSourceDependent {
public int getSum(int a, int b){
return a+b;
}
private static java.util.List _jspx_dependants;
public Object getDependants() {
return _jspx_dependants;
}
public void _jspService(HttpServletRequest request, HttpServletResponse response)
throws java.io.IOException, ServletException {
JspFactory _jspxFactory = null;
PageContext pageContext = null;
HttpSession session = null;
ServletContext application = null;
ServletConfig config = null;
JspWriter out = null;
Object page = this;
JspWriter _jspx_out = null;
PageContext _jspx_page_context = null;
try {
_jspxFactory = JspFactory.getDefaultFactory();
response.setContentType("text/html");
pageContext = _jspxFactory.getPageContext(this, request, response,
null, true, 8192, true);
_jspx_page_context = pageContext;
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;
out.write("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">\r\n");
out.write("<HTML>\r\n");
out.write(" <HEAD>\r\n");
out.write(" <BODY>\r\n");
out.write(" \t");
out.write("\r\n");
out.write(" </BODY>\r\n");
out.write("</HTML>\r\n");
} catch (Throwable t) {
if (!(t instanceof SkipPageException)){
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
out.clearBuffer();
if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
}
} finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
}
}
}
JSP Scriptlets -
JSP Scriptlets is also used for embed code with in a _jspService() methods in servelt. Any code which is written in JSP Declaratives will goes to _jspService() method of servlet. JSP Scriptlets syntax is
<%
//embed java code
%>
Example -
<html>
<body>
<%
System.out.println(“This is my first JSP Page”);
%>
</body>
</html>
JSP Expressions -
JSP Expressions is used for print any variable on JSP page. It works like out.println(); function.
Syntax of JSP Expressions -
<%= // variable will comes here %>
Example -
<HTML>
<HEAD>
<BODY>
<%="My First JSP Page"%>
</BODY>
</HTML>
JSP has mainly six type of components.
1.JSP Declaratives
2.JSP Scriptlets
3.JSP Expressions
4.Directives
5.Implicit Objects
6.Standard Actions
JSP Declaratives -
JSP Declaratives is used for embed Java code in class label. Any code which is written in JSP Declaratives will goes to scope of a class of servlet. JSP Declaratives is open with <%! and closed with %> syntax.
If any variable is made in JSP Declaratives means this variable will be available for any where with in JSP.
Example -
<HTML>
<HEAD>
<BODY>
<%!
public int getSum(int a, int b){
return a+b;
}
%>
</BODY>
</HTML>
Servlet of this JSP will be -
package org.apache.jsp;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
public final class test_jsp extends org.apache.jasper.runtime.HttpJspBase
implements org.apache.jasper.runtime.JspSourceDependent {
public int getSum(int a, int b){
return a+b;
}
private static java.util.List _jspx_dependants;
public Object getDependants() {
return _jspx_dependants;
}
public void _jspService(HttpServletRequest request, HttpServletResponse response)
throws java.io.IOException, ServletException {
JspFactory _jspxFactory = null;
PageContext pageContext = null;
HttpSession session = null;
ServletContext application = null;
ServletConfig config = null;
JspWriter out = null;
Object page = this;
JspWriter _jspx_out = null;
PageContext _jspx_page_context = null;
try {
_jspxFactory = JspFactory.getDefaultFactory();
response.setContentType("text/html");
pageContext = _jspxFactory.getPageContext(this, request, response,
null, true, 8192, true);
_jspx_page_context = pageContext;
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;
out.write("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">\r\n");
out.write("<HTML>\r\n");
out.write(" <HEAD>\r\n");
out.write(" <BODY>\r\n");
out.write(" \t");
out.write("\r\n");
out.write(" </BODY>\r\n");
out.write("</HTML>\r\n");
} catch (Throwable t) {
if (!(t instanceof SkipPageException)){
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
out.clearBuffer();
if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
}
} finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
}
}
}
JSP Scriptlets -
JSP Scriptlets is also used for embed code with in a _jspService() methods in servelt. Any code which is written in JSP Declaratives will goes to _jspService() method of servlet. JSP Scriptlets syntax is
<%
//embed java code
%>
Example -
<html>
<body>
<%
System.out.println(“This is my first JSP Page”);
%>
</body>
</html>
JSP Expressions -
JSP Expressions is used for print any variable on JSP page. It works like out.println(); function.
Syntax of JSP Expressions -
<%= // variable will comes here %>
Example -
<HTML>
<HEAD>
<BODY>
<%="My First JSP Page"%>
</BODY>
</HTML>
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