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