addbookaction.java

struts-bookstore 值得参考的MVC代码!

package ch24.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import cart.ShoppingCart;
import ch24.struts.form.AddBookForm;
import database.BookDB;
import database.BookDetails;

/** 
 * XDoclet definition:
 * @struts:action path="/addbook" name="addBookForm" input="/form/addbook.jsp" validate="true"
 * @struts:action-forward name="addbookerror.jsp" path="addbookerror.jsp" redirect="true"
 * @struts:action-forward name="bookcatalog" path="bookcatalog" redirect="true"
 */
public class AddBookAction extends Action {

	/** 
	 * Method execute
	 * @param ActionMapping mapping
	 * @param ActionForm form
	 * @param HttpServletRequest request
	 * @param HttpServletResponse response
	 * @return ActionForward
	 * @throws Exception
	 */
	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response)
		throws Exception {
	    
		AddBookForm bookForm = (AddBookForm) form;
		HttpSession session = request.getSession();
	    
		BookDB bookDB = (BookDB)session.getAttribute("bookDB");
		bookDB.setBookId(bookForm.getBookId());
		BookDetails addedBook = bookDB.getBookDetails();
		request.setAttribute("addedBook", addedBook);
		
		ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
	    if (cart == null) {
            cart = new ShoppingCart();
            session.setAttribute("cart", cart);
        }
		cart.add(bookForm.getBookId(), addedBook);
		
		return (mapping.findForward("Success"));
	}

}