//file: ShowSession.java
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import java.util.Enumeration;
public class ShowSession extends HttpServlet {
public void doPost(
HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doGet( request, response );
}
public void doGet(
HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
HttpSession session = request.getSession( );
boolean clear = request.getParameter("clear") != null;
if ( clear )
session.invalidate();
else {
String name = request.getParameter("Name");
String value = request.getParameter("Value");
if ( name != null && value != null )
session.setAttribute( name, value );
}
response.setContentType("text/html");
PrintWriter out = response.getWriter( );
out.println(
"<html><head><title>Show Session</title></head><body>");
if ( clear )
out.println("<h1>Session Cleared:</h1>");
else {
out.println("<h1>In this session:</h1><ul>");
Enumeration names = session.getAttributeNames();
while ( names.hasMoreElements() ) {
String name = (String)names.nextElement();
out.println( "<li>"+name+" = " +session.getAttribute( name ) );
}
}
out.println(
"</ul><p><hr><h1>Add String</h1>"
+ "<form method=\"POST\" action=\""
+ request.getRequestURI( ) +"\">"
+ "Name: <input name=\"Name\" size=20><br>"
+ "Value: <input name=\"Value\" size=20><br>"
+ "<br><input type=\"submit\" value=\"Submit\">"
+ "<input type=\"submit\" name=\"clear\" value=\"Clear\"></form>"
);
}
}
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