Example program to illustrate about jsp:forward and jsp:param tags:
Develop a web application to add or sub of two numbers using jsp:forward and jsp:param tags
Steps:
Maintain the folder structure:
Home.html
<html>
<head>
<title>ActionTags
</title>
</head>
<body>
<pre>
<form action="FronJSP.jsp" method="get">
<b>Enter value of A </b><input type="text" name="field1"/>
<b>Enter value of B</b><input type="text" name="field2"/>
<input type="submit" name="submit" value="Add"/>
<input type="submit" name="submit" value="Sub"/>
</form>
</pre>
</body>
</html>
FronJSP.jsp
<%@page errorPage="/Home.html"%>
<%
String s1=request.getParameter("field1");
String s2=request.getParameter("field2");
Integer.parseInt(s1);
Integer.parseInt(s2);
String s3=request.getParameter("submit");
if(s3.equals("Add"))
{
%>
<jsp:forward page="/AddJsp.jsp"/>
<%
}
else if(s3.equals("Sub"))
{
%>
<jsp:forward page="/SubJsp.jsp"/>
<%
}
else
{%>
<jsp:forward page="/Home.html"/>
<% }%>
//AddJsp.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int a=Integer.parseInt(request.getParameter("field1"));
int b=Integer.parseInt(request.getParameter("field2"));
int result=a+b;
%>
<jsp:forward page="/Result.jsp">
<jsp:param value="<%=result%>" name="output"/>
</jsp:forward>
SubJsp.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int a=Integer.parseInt(request.getParameter("field1"));
int b=Integer.parseInt(request.getParameter("field2"));
int result=a-b;
%>
<jsp:forward page="/Result.jsp">
<jsp:param name="output" value="<%=result%>"></jsp:param>
</jsp:forward>
Result.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int a=Integer.parseInt(request.getParameter("field1"));
int b=Integer.parseInt(request.getParameter("field2"));
int result=a-b;
%>
<jsp:forward page="/Result.jsp">
<jsp:param name="output" value="<%=result%>"></jsp:param>
</jsp:forward>
Go to WEB-INF folder, create web.xml file (this is optional)
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>ActionTag</display-name>
<welcome-file-list>
<welcome-file>Home.html</welcome-file>
</welcome-file-list>
</web-app>
Ho
Jsp Action Tags:
Develop a web application to add or sub of two numbers using jsp:forward and jsp:param tags
Steps:
Maintain the folder structure:
Home.html
<html>
<head>
<title>ActionTags
</title>
</head>
<body>
<pre>
<form action="FronJSP.jsp" method="get">
<b>Enter value of A </b><input type="text" name="field1"/>
<b>Enter value of B</b><input type="text" name="field2"/>
<input type="submit" name="submit" value="Add"/>
<input type="submit" name="submit" value="Sub"/>
</form>
</pre>
</body>
</html>
FronJSP.jsp
<%@page errorPage="/Home.html"%>
<%
String s1=request.getParameter("field1");
String s2=request.getParameter("field2");
Integer.parseInt(s1);
Integer.parseInt(s2);
String s3=request.getParameter("submit");
if(s3.equals("Add"))
{
%>
<jsp:forward page="/AddJsp.jsp"/>
<%
}
else if(s3.equals("Sub"))
{
%>
<jsp:forward page="/SubJsp.jsp"/>
<%
}
else
{%>
<jsp:forward page="/Home.html"/>
<% }%>
//AddJsp.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int a=Integer.parseInt(request.getParameter("field1"));
int b=Integer.parseInt(request.getParameter("field2"));
int result=a+b;
%>
<jsp:forward page="/Result.jsp">
<jsp:param value="<%=result%>" name="output"/>
</jsp:forward>
SubJsp.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int a=Integer.parseInt(request.getParameter("field1"));
int b=Integer.parseInt(request.getParameter("field2"));
int result=a-b;
%>
<jsp:forward page="/Result.jsp">
<jsp:param name="output" value="<%=result%>"></jsp:param>
</jsp:forward>
Result.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
int a=Integer.parseInt(request.getParameter("field1"));
int b=Integer.parseInt(request.getParameter("field2"));
int result=a-b;
%>
<jsp:forward page="/Result.jsp">
<jsp:param name="output" value="<%=result%>"></jsp:param>
</jsp:forward>
Go to WEB-INF folder, create web.xml file (this is optional)
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>ActionTag</display-name>
<welcome-file-list>
<welcome-file>Home.html</welcome-file>
</welcome-file-list>
</web-app>
Jsp Action Tags:
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