Log Filter : Log « Servlets « Java

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Java » Servlets » LogScreenshots 
Log Filter
 
//Log4j from Apache is required

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

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

public class LogFilter implements Filter {

  private FilterConfig config;

  private Logger log;

  /** Creates new RequestFilter */
  public LogFilter() {
  }

  public void init(FilterConfig filterConfigthrows ServletException {

    this.config = filterConfig;
    //load the configuration for this application's loggers using the
    // servletLog.properties file
    PropertyConfigurator.configure(config.getServletContext().getRealPath(
        "/")
        "WEB-INF/classes/servletLog.properties");
    log = Logger.getLogger(LogFilter.class);
    log.info("Logger instantiated in " + getClass().getName());
  }

  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain chainthrows java.io.IOException, ServletException {

    HttpServletRequest req = null;
    String id = config.getInitParameter("log-id");

    if (id == null)
      id = "unknown";

    if (log != null && (request instanceof HttpServletRequest)) {

      req = (HttpServletRequestrequest;
      log.info("Log id:" + id + ": Request received from: "
          + req.getRemoteHost() " for " + req.getRequestURL());
    }

    chain.doFilter(request, response);
  }// doFilter

  public void destroy() {
    /*
     * called before the Filter instance is removed from service by the web
     * container
     */
    log = null;
  }
}
           
         
  
Related examples in the same category
1. Servlets Logging Filter Demo
2. Logging Filter
3. Context log
4. Logger without configure file
5. Logger Servlet
6. Another logger servlet
7. Logger new config
8. Servlet: Root logger
9. Session logger
10. LoggerSkel for Servlet
11. Context logger
12. Log in ServletContext
13. Servlet Logging
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