How to use 'for' loop in jsp page ?
This is detailed java code that shows how to use 'for'
loop in jsp page. 'if' statement is used to test conditions while 'for'
loop is used to define a loop that reiterates statements. It specifies initialization variables,
exit condition and the
statements to be executed for the
loop. In this example, we have developed use_for_loop.jsp
page which shows the use of 'for' in JSP.
use_for_loop.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<HEAD>
<TITLE>table generator.</TITLE>
</HEAD>
<BODY bgcolor="#6E6E6E">
<FORM NAME="form1" ACTION="use_for_loop.jsp" METHOD="get">
<table bgcolor="#D8D8D8">
<p><font color="#F8E0F7">Enter number
for which you want to create <br>table
and limit of table here.</font></p>
<tr>
<td> Enter number </td>
<td><input type="text" name="num"></td>
</tr>
<tr>
<td> Enter limit </td>
<td><input type="text" name="limit"></td>
</tr>
<tr align="center"><td></td>
<td><INPUT TYPE="submit" VALUE="show table"></td>
</table><br>
<table bgcolor="#F6E3CE" border="1" width="23%">
<%
/* here if statement will check that text boxes are
empty or value in text boxes
are null */
if (request.getParameter("num") != null &&
request.getParameter("limit") != null){
if (request.getParameter("num") != "" &&
request.getParameter("limit") != "") {
// use for loop
for (int i = 0;
i < Long.parseLong(request.getParameter("limit"));
i++) {
%>
<tr align="center">
<td><%= request.getParameter("num")%> * <%= (i + 1)%></td>
<td>
<%= (Long.parseLong(request.getParameter("num")) * (i + 1))%></td>
</tr>
<% }
}
}%>
</FORM>
</body>
</html>
Save this code as a .jsp file named "use_for_loop.jsp" in the application directory of tomcat server and run this jsp page with url "http://localhost:8080/user/use_for_loop.jsp" in address bar of the browser.
When user enter integer value in appropriate text box
and click on show table button.
For this example, suppose user enters number is 5
and limit is 10.
This page show the table of 5 of the limit 10.