Context log : Log « Servlets « Java

Context log

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, {

    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"));
      context.log("Here is the visitor's message: " + yourMessage);

    response.setContentType("text/html"); 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>");
  } //end doGet


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