ContextLog.java Source code

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import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ContextLog extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, java.io.IOException {

        String yourMessage = request.getParameter("mine");
        //Call the two ServletContext.log methods
        //the javax.servlet.GenericServlet.getServletContext method
        ServletContext context = getServletContext();
        if (yourMessage == null || yourMessage.equals(""))
            //log version with Throwable parameter
            context.log("No message received:", new IllegalStateException("Missing parameter"));
        else
            context.log("Here is the visitor's message: " + yourMessage);

        response.setContentType("text/html");
        java.io.PrintWriter out = response.getWriter();
        //logging servlets probably want to display more HTML; this is 'lazy
        // HTML'
        out.println("<html><head><title>ServletContext logging</title></head><body>");
        out.println("<h2>Messages sent</h2>");
        out.println("</body></html>");
    } //end doGet
}