sessioncontainer.java

网上商店 新增功能： 1

package netstore.framework;
import java.util.Locale;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionBindingEvent;
import netstore.businessobjects.Customer;

/**
 * Used to store information about a specific user. This class is used
 * so that the information is not scattered throughout the HttpSession.
 * Only this object is stored in the session for the user. This class
 * implements the HttpSessionBindingListener interface so that it can
 * be notified of session timeout and perform the proper cleanup.
 * 
 * 用来存贮客户数据，不通过HttpSession存
 * 这个类实现了HttpSessionBindingListener接口
 * 所以能够被session超时唤醒，执行相应清理动作
 */
public class SessionContainer implements HttpSessionBindingListener {
  // The user's shopping cart
  //购物车
  private ShoppingCart cart = null;
  
  //  Data about the user that is cached
  //客户对象本身
  private Customer customer = null;

  private String currentOrderNumber=null;
  /**
   * The Locale object for the user. Although Struts stores a Locale for
   * each user in the session, the locale is also maintained here.
   */
  private Locale locale;

  /**
   * Default Constructor
   */
  public SessionContainer() {
    super();
    initialize();
  }

  /**
   * The container calls this method when it is being unbound from the
   * session.
   */
  public void valueUnbound(HttpSessionBindingEvent event) {
    // Perform resource cleanup
    System.out.println( "Being unbound...");
    cleanUp();
  }

  public ShoppingCart getCart() {
    return cart;
  }

  public void setCart(ShoppingCart newCart) {
    cart = newCart;
  }

  public String getCurrentOrderNumber() {
    return currentOrderNumber;
  }

  public void setCurrentOrderNumber(String currentOrderNumber) {
    this.currentOrderNumber = currentOrderNumber;
  }

  /**
   * Set the locale for the user.
   */
  public void setLocale(Locale aLocale) {
    locale = aLocale;
  }

  /**
   * Retrieve the locale for the user.
   */
  public Locale getLocale() {
    return locale;
  }

  /**
   * The container calls this method when it is being bound to the
   * session.
   */
  public void valueBound(HttpSessionBindingEvent event) {
  // Don't need to do anything, but still have to implement the
  // interface method.
  }

  public Customer getCustomer() {
    return customer;
  }

  public void setCustomer(Customer customer) {
    this.customer = customer;
  }

  /**
   * Initialize all of the required resources
   */
  private void initialize() {
    // Create a new Shopping cart for this user
    cart = new ShoppingCart();
  }

  /**
   * Clean up any open resources. The shopping cart is left intact
   * intentionally.
   */
  public void cleanUp() {
    setCustomer( null );
  }
}