Logger Servlet
//Log4j from Apache is required
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import javax.servlet.*;
import javax.servlet.http.*;
public class LoggerServlet extends HttpServlet {
private Logger log = null;
public void init() {
String realPath = getServletContext().getRealPath("/");
String fileSep = System.getProperty("file.separator");
if (realPath != null && (!realPath.endsWith(fileSep)))
realPath = realPath + fileSep;
System.out.println(realPath);
//load the configuration for this application's loggers using the
// servletLog.properties file
PropertyConfigurator.configure(realPath
+ "WEB-INF/classes/servletLog.properties");
//create the logger for this servlet class
//it will use the configuration for the logger com.java2s.LoggerServlet
//or inherit from the logger com.java2s if one exists, and so on
log = Logger.getLogger(LoggerServlet.class);
log.info("LoggerServlet started.");
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
//display a DEBUG level message
log.debug("Sending a DEBUG message");
//display an INFO level message
log.info("Sending an INFO message");
//better display something
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("<html><head><title>Servlet logging</title></head><body>");
out.println("<h2>Hello from LoggerServlet</h2>");
out.println("Your logger name is: " + log.getName() + "<br>");
out.println("Your logger parent is: " + log.getParent().getName()
+ "<br>");
out.println("</body></html>");
out.close();
} //end doGet
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doGet(request, response);
}
}
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