//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 {
response.setContentType("text/html");
PrintWriter out = response.getWriter( );
out.println(
"<html><head><title>Show Session</title></head><body>");
HttpSession session = request.getSession( );
out.println("<h1>In this session:</h1><ul>");
String [] names = session.getValueNames( );
for (int i=0; i< names.length; i++)
out.println(
"<li>"+names[i]+" = "+session.getValue( names[i] ));
// add new name-value to session
String name = request.getParameter("Name");
if ( name != null ) {
String value = request.getParameter("Value");
session.putValue( name, value );
}
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\"></form>"
);
out.close( );
}
}
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