productaction.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.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;


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

public class ProductAction extends DispatchActionEx
{
	// 删除操作
	public ActionForward delete(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 删除商品信息
		OperateDB.deleteData( form );
		// 设置提示信息
		addMessage( request, "result", "product_delete_success" );
		return unspecified( mapping, form, request, response );
	}

	// 查询操作
	public ActionForward query(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 得到符合用户输入条件的商品信息
		Collection products = ManageDB.getProducts( (Product)form );
		if( products.isEmpty() )
		{
			// 设置"没有符合条件的商品信息"的提示信息
			addMessage( request, "result", "product_query_notfound" );
		}
		else
		{
			// 将查询结果设置为请求的proeucts属性
			request.setAttribute( "products", products );
			// 得到所有的商品分类信息
			request.setAttribute( "categorys", ManageDB.getCategorys( ) );
			// 设置提示信息
			addMessage( request, "result", "product_query_success" );
		}
		return mapping.findForward( "list" );
	}

	// 跳转到维护页面
	public ActionForward update(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 得到要修改的商品信息
		Product product = (Product)OperateDB.getObjectByID( Product.class, ((Product)form).getId() );
		request.setAttribute( "product", product );
		addMessage( request, "result", "product_update_prompt" );
		return add( mapping, form, request, response );
	}

	// 跳转到详细信息页面
	public ActionForward detail(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 得到用户要查看的商品的信息
		Product product = (Product)OperateDB.getObjectByID( Product.class, ((Product)form).getId() );
		if( product!=null )
		{
			// 找到用户要查看的商品信息
			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
		{
			// 没有找到用户要查看的商品信息
			addMessage( request, "result", "product_detail_notfound" );
		}
		return mapping.findForward( "detail" );
	}

	// 跳转到维护页面
	public ActionForward add(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 得到所有的商品分类信息
		request.setAttribute( "categorys", ManageDB.getCategorys( ) );

		return mapping.findForward( "store" );
	}

	// 维护操作
	public ActionForward store(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 保存商品的信息
		OperateDB.storeData( form );
		// 保存商品的图片
		ManageDB.savePicture( (Product)form );

		addMessage( request, "result", "product_store_success" );
		return add( mapping, form, request, response );
	}

	// 默认响应，跳转到查询页面
	public ActionForward unspecified(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 得到所有的商品分类信息
		request.setAttribute( "categorys", ManageDB.getCategorys( ) );

		addMessage( request, "result", "product_query_prompt" );
		return mapping.findForward( "query" );
	}

}