checklogin.java

首先确保MySQL4.0数据库已经正确安装

package edu.jnestore.service;


import javax.servlet.http.HttpSession;
import edu.jnestore.common.Constants;


public class CheckLogin
{
  private String UserBeanName = Constants.USER_KEY;
  private static CheckLogin instance = new CheckLogin();
  /**
   * get singleton instance
   * @return
   */
  public static CheckLogin getInstance()
  {
    return instance;
  }
  private CheckLogin()
  {
  }
  /**
   * get the name of user Class in session
   * @return user class name
   */
  public String getUserBeanName()
  {
    return UserBeanName;
  }
  /**
   * get the name of user Class in session
   * @param UserBeanName user class name
   */
  public void setUserBeanName(String UserBeanName)
  {
    this.UserBeanName = UserBeanName;
  }
  /**
   * check user status
   * @param session current session
   * @return true if logged in ,else false
   */
  public boolean isLogin(HttpSession session)
  {
    if(session==null || session.getAttribute(this.UserBeanName)==null)
    {
      return false;
    }
    return true;
  }
}