Context logger : Log « Servlets « Java

1. Java
2. Servlets
3. Log

Context logger

 
//Log4j from Apache is required

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

import javax.servlet.*;
import javax.servlet.http.*;

public class ContextLogger implements ServletContextListener {

  private Logger log;

  public ContextLogger() {
  }

  public void contextDestroyed(ServletContextEvent sce) {

    String name = sce.getServletContext().getServletContextName();

    //log request of the INFO level
    log.info("ServletContext shut down: " + (name == null ? "" : name));

  }

  public void contextInitialized(ServletContextEvent sce) {

    ServletContext context = sce.getServletContext();

    String realPath = context.getRealPath("/");
    String fileSep = System.getProperty("file.separator");

    if (realPath != null && (!realPath.endsWith(fileSep)))
      realPath = realPath + fileSep;
    //Initialize logger here:
    PropertyConfigurator.configure(realPath + "WEB-INF/classes/"
        + context.getInitParameter("logger-config"));
    log = Logger.getLogger(ContextLogger.class);

    String name = context.getServletContextName();
    //log request about servlet context being initialized
    log.info("ServletContext ready: " + (name == null ? "" : name));

  }

}

           
         
  

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