cartdataforweb.java~8~

购物车模块实例。购物车模块可以浏览商品类别；可以根据商品类别浏览商品信息；可以购买商品；可以查看购物车的商品；可以修改购买商品的数量和删除购买的商品。

package data;

import javax.naming.*;
import java.util.Properties;
import javax.rmi.PortableRemoteObject;
import java.rmi.RemoteException;
import cmscartpro.*;

public class CartDataForWeb {
  CartDataHome cartDataHome = null;
  CartData cartData = null;

  public CartDataForWeb() {
    try{initialize();}catch(Exception ex){ex.printStackTrace();}
  }

  //EJB的初始化方法
  public void initialize() throws Exception {
    //创建服务器对象查找类
    Context context = new InitialContext();
    //取得EJB在服务器的对象
    Object ref = context.lookup("CartData");
    //取得CartData EJB的创建接口
    cartDataHome = (CartDataHome) PortableRemoteObject.narrow(ref,
        CartDataHome.class);
    //取得CartData EJB的远程接口
    cartData = create();
  }
  //服务器对象查找类的创建方法
  private Context getInitialContext() throws Exception {
    String url = "t3://bemyfriend:7001";
    String user = null;
    String password = null;
    Properties properties = null;
    //初始化联接服务器的属性
    try {
      properties = new Properties();
      properties.put(Context.INITIAL_CONTEXT_FACTORY,
                     "weblogic.jndi.WLInitialContextFactory");
      properties.put(Context.PROVIDER_URL, url);
      if (user != null) {
        properties.put(Context.SECURITY_PRINCIPAL, user);
        properties.put(Context.SECURITY_CREDENTIALS, password == null ? "" : password);
      }
      return new InitialContext(properties);
    }
    catch(Exception e) {
      System.out.println("Unable to connect to WebLogic server at " + url);
      System.out.println("Please make sure that the server is running.");
      throw e;
    }
  }
  //创建Cart EJB的远程接口
  public CartData create() throws Exception {
    cartData = cartDataHome.create();
    return cartData;
  }
  //取得产品类别数组的方法
  public String[][] getCategories() throws Exception{
    return cartData.getCategories();
  }
  //取得产品数组的方法
  public String[][] getProducts(int categoryId) throws Exception{
    return cartData.getProducts(categoryId);
  }
}