系统session监听类，用于保存用户登入系统参数的session对象信息

package com.ebupt.mrbis.listener;

import javax.servlet.ServletRequestEvent;

import javax.servlet.ServletRequestListener;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

/**

 * BI系统session监听类，用于保存用户登入系统参数的session对象信息

 * @author chenjian

 *

 */

public class BISessionListener implements HttpSessionListener,ServletRequestListener {

private final Log logger = LogFactory.getLog(getClass());
private  HttpServletRequest  request;
@Override
public void requestDestroyed(ServletRequestEvent arg0) {
// TODO Auto-generated method stub

}

@Override
public void requestInitialized(ServletRequestEvent sre) {
// TODO Auto-generated method stub
request=(HttpServletRequest)sre.getServletRequest();
}

public void sessionCreated(HttpSessionEvent httpsessionEvent) {
logger.info("---BISessionListener------sessionCreated----------");
String ip = getIpAddr(request);
System.out.println("ip:" + ip);
HttpSession session = httpsessionEvent.getSession();
session.setAttribute("ipAddress", ip);
BISessionContext.addSession(session);//httpsessionEvent.getSession());

}
public String getIpAddr(HttpServletRequest request) {
  String ip = request.getHeader("x-forwarded-for");
  System.out.println("forwarded:" + request.getHeader("x-forwarded-for") + ",Proxy-Client-IP:" + request.getHeader("Proxy-Client-IP")+
  ",WL-Proxy-Client-IP:" + request.getHeader("WL-Proxy-Client-IP") + ",remote:" + request.getRemoteAddr());
  if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
  ip = request.getHeader("Proxy-Client-IP");
  }
  if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
  ip = request.getHeader("WL-Proxy-Client-IP");
  }
  if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getRemoteAddr();
  }
  //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
  if(ip!=null && ip.length()>15){ //"***.***.***.***".length() = 15
  if(ip.indexOf(",")>0){
  ip = ip.substring(0,ip.indexOf(","));
  }
  }
  return ip;
}

public void sessionDestroyed(HttpSessionEvent httpsessionEvent) {

logger.info("---BISessionListener------sessionDestroyed---------- ");

HttpSession session = httpsessionEvent.getSession();

BISessionContext.delSession(session);

}

}