<%@ page import="java.io.*" %>

<%


        // process page



    String action = request.getParameter("action");


        String yearString = request.getParameter("year");



        int year = -1;


        boolean hasError = false;
        String message = null;





    if (action == null || action.equals("Clear"))

        {
                yearString = null;
        }
        else if (yearString == null || yearString.equals(""))
        {
                hasError = true;
                message = "Enter an integer between 1 and 9999 for <i>Year</i>!";
        }
        else
        {
                try
                {
                        year = Integer.valueOf(yearString).intValue();
                }
                catch (NumberFormatException nfe)
                {
                        hasError = true;
                    message = "Enter an integer between 1 and 9999 for <i>Year</i>!";
                }
        }

        // print page




%>

<html>

<head><title>UNIX cal Utility</title></head>
<body bgcolor="white">

<font size=3>

Enter <i>Year</i> below to see the calendar of that year using the UNIX <i>cal</i> command.
<form method=POST action=Cal.jsp>

<%

        if (yearString == null || yearString.equals(""))
        {




%>

<i>Year</i> <input type=text name=year size=8 maxlength=8>
<%

        }
        else
        {




%>

<i>Year</i> <input type=text name=year value=<%= yearString %> size=8 maxlength=8>
<%


        }

%>

<p>

<i>

<input type=submit name=action value="Display">
<input type=submit name=action value="Clear">
</i>

</form>

<%


    if (action == null || action.equals("Clear"))

        {
        }
        else if (action.equals("Display"))
        {
        Runtime rt = Runtime.getRuntime();
        Process p = rt.exec("cal "+year);
        int exitValue = p.waitFor();
        if (exitValue != 0)
        {
            hasError = true;
                    message = "Enter an integer between 1 and 9999 for <i>Year</i>!";
        }

        if (!hasError)
        {
            InputStreamReader isr = new InputStreamReader(p.getInputStream());
            BufferedReader br = new BufferedReader(isr);
            String line = null;




%>

<pre>

<%

            try
            {
                while ((line = br.readLine()) != null)
                {




%>

<%= line %>

<%

                }
            }
            catch (IOException ioe) {}
        }




%>

</pre>

<%


    }


        if (hasError)
        {




%>

<%= message %>

<%


        }

%>

</font>

<hr>

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</body>

</html>