indexaction.java

该代码是Java数据库高级编程宝典中的重要的代码

package jdbcbook.shopping.action;

import java.io.IOException;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.Globals;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import jdbcbook.shopping.util.*;
import jdbcbook.shopping.database.*;
import jdbcbook.shopping.form.*;

public class IndexAction extends DispatchActionEx
{
	// 切换到English界面
	public ActionForward english(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		HttpSession session = request.getSession();
		session.setAttribute(Globals.LOCALE_KEY, new Locale("en", ""));

		return unspecified( mapping, form, request, response );
	}

	// 切换到Chinese界面
	public ActionForward chinese(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		HttpSession session = request.getSession();
		session.setAttribute(Globals.LOCALE_KEY, new Locale("zh_CN", ""));

		return unspecified( mapping, form, request, response );
	}

	// 缺省处理方法，用于得到网站首页所需要的数据
	public ActionForward unspecified(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 取得首页需要显示的商品信息
		Collection products = ManageDB.getProducts( (Product)form );
		request.setAttribute( "products", products );
		// 取得所有的类别信息
		request.setAttribute( "categorys", ManageDB.getCategorys( ) );
		return mapping.findForward( "index" );
	}

	// 跳转到详细信息页面
	public ActionForward detail(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 取得用户所要查看的产品的信息
		Product product = (Product)OperateDB.getObjectByID( Product.class, ((Product)form).getId() );
		if( product!=null )
		{
			request.setAttribute( "product", product );
			// 得到商品的分类
			Category category = (Category)OperateDB.getObjectByID( Category.class, product.getCategoryid() );
			request.setAttribute( "category", category );
		}
		else
		{
			addMessage( request, "result", "product_detail_notfound" );
		}
		return mapping.findForward( "detail" );
	}
}