116 lines
3.2 KiB
Java
116 lines
3.2 KiB
Java
Information Servlet
|
|
|
|
// Import standard networking I/O packages
|
|
import java.net.*;
|
|
import java.io.*;
|
|
|
|
// Enumeration from util
|
|
import java.util.Enumeration;
|
|
|
|
// Import servlet packages
|
|
import javax.servlet.*;
|
|
import javax.servlet.http.*;
|
|
|
|
//
|
|
//
|
|
// InfoServlet
|
|
//
|
|
//
|
|
public class InfoServlet extends HttpServlet
|
|
{
|
|
|
|
// Get method of servlet
|
|
public void doGet (HttpServletRequest request, HttpServletResponse response) throws IOException
|
|
{
|
|
// Define content type
|
|
response.setContentType("text/html");
|
|
|
|
// Get information about client and server
|
|
String clientBrowser = request.getHeader("User-Agent");
|
|
String clientReferer = request.getHeader("Referer");
|
|
String clientIP = request.getRemoteAddr();
|
|
String serverOS = System.getProperty("os.name");
|
|
String serverOSVersion = System.getProperty("os.version");
|
|
String serverOSArch = System.getProperty("os.arch");
|
|
|
|
// Get a servlet output stream for the response
|
|
ServletOutputStream sout = response.getOutputStream();
|
|
|
|
// Print header information
|
|
sout.println ("<HTML><HEAD><TITLE>InfoServlet Response</TITLE></HEAD>");
|
|
|
|
// Print body information
|
|
sout.println ("<BODY BGCOLOR='white' COLOR='black'>");
|
|
sout.println ("<H2>InfoServlet</H2><HR>");
|
|
|
|
// Print information about client
|
|
sout.println ("<H3>Client :-</H3>");
|
|
|
|
// Check for presence of user-agent header field
|
|
if (clientBrowser != null)
|
|
sout.println ("User-Agent : " + clientBrowser + "<BR>");
|
|
|
|
// Print IP address
|
|
sout.println ("IP Address : " + clientIP + "<BR>");
|
|
|
|
// Check for presence of referer header field
|
|
if (clientReferer != null)
|
|
sout.println ("Last page : " + clientReferer + "<BR>");
|
|
|
|
// Print information about server
|
|
sout.println ("<H3>Server</H3>");
|
|
|
|
// Check to see if each property is valid, and if so, output it
|
|
if ( (serverOS != null) & (serverOSVersion != null) )
|
|
sout.println ("Server O/S : " + serverOS + " v" + serverOSVersion + "<BR>");
|
|
|
|
if ( serverOSArch != null)
|
|
sout.println ("Server CPU : " + serverOSArch + "<BR>");
|
|
|
|
// Obtain a reference to the server context
|
|
ServletContext context = getServletContext();
|
|
|
|
if (context != null)
|
|
{
|
|
// Display information about servlets
|
|
sout.println ("<h3> Servlet information </h3>");
|
|
|
|
// Table for servlet info
|
|
sout.println ("<table border='1' width=70%>");
|
|
sout.println ("<tr><td><b>Servlet Name</b></td></tr>");
|
|
for (Enumeration e = context.getServletNames(); e.hasMoreElements();)
|
|
{
|
|
// Get name of servlet
|
|
String name = (String) e.nextElement();
|
|
|
|
sout.println ("<tr> <td>");
|
|
sout.println (name);
|
|
sout.println ("</td> </tr>");
|
|
}
|
|
|
|
sout.println ("</table>");
|
|
}
|
|
else
|
|
sout.println ("Could not determine servlet context");
|
|
// Write footer information
|
|
sout.println ("</BODY></HTML>");
|
|
|
|
// Flush
|
|
sout.flush();
|
|
}
|
|
|
|
// Post method of servlet
|
|
public void doPost (HttpServletRequest request, HttpServletResponse response) throws IOException
|
|
{
|
|
// Perform same action as get method
|
|
doGet(request, response);
|
|
}
|
|
|
|
public String getServletInfo()
|
|
{
|
|
return new String (
|
|
"InfoServlet - reports information on client connection and server state"
|
|
);
|
|
}
|
|
}
|