itemhandler.java

使用EJB实现的网上商城

package com.jdon.estore.web.catalog;

import com.jdon.strutsutil.ModelHandler;
import com.jdon.strutsutil.ModelForm;
import javax.servlet.http.HttpServletRequest;
import com.jdon.controller.model.Model;
import com.jdon.controller.events.EventModel;
import com.jdon.controller.events.Event;

import com.jdon.estore.catalog.ProductManagerLocal;
import com.jdon.estore.catalog.CatalogManagerLocal;
import com.jdon.estore.FrameworkServices;
import com.jdon.bussinessproxy.ServiceServerFactory;
import com.jdon.bussinessproxy.EJBDefinition;
import com.jdon.controller.cache.CacheFactory;

import com.jdon.strutsutil.file.UploadAction;

import com.jdon.estore.model.*;

public class ItemHandler implements ModelHandler {
  private final static String module = ItemHandler.class.getName();
  private final static ServiceServerFactory sf = ServiceServerFactory.
      getInstance();

  public ModelForm initForm(HttpServletRequest request) throws Exception{
    ItemForm form = new ItemForm();
    String productId = request.getParameter("productId");
    if ((productId == null) || (productId.length() == 0))
        throw new Exception();
    form.setProductId(productId);
    return form;
  }

  public Model findModelByKey(String keyValue, HttpServletRequest request) throws Exception{
    ProductManagerLocal productManager = (ProductManagerLocal) sf.getService(
        FrameworkServices.ProductEJB, request);
    return productManager.getItemById(keyValue);
  }

  public void serviceAction(EventModel em, HttpServletRequest request) throws
      java.lang.Exception {

    ProductManagerLocal productManager = (ProductManagerLocal) sf.getService(
        FrameworkServices.ProductEJB, request);

    byte[] data = (byte[]) UploadAction.getUploadData(request);
    if (data != null) {
      Item item = (Item) em.getModel();
      item.setImage(data);
    }

    try {
      switch (em.getActionType()) {
        case Event.CREATE:
          productManager.createItem(em);
          break;
        case Event.EDIT:
          productManager.updateItem(em);
          break;
        case Event.DELETE:
          productManager.deleteItem(em);
          break;
      }
    } catch (Exception ex) {
      throw new Exception("System operation Error:" + ex);
    }
  }

  public ModelHandler newInstance() {
    return new ItemHandler();
  }

}