categoryaction.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 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 CategoryAction extends DispatchActionEx
{
	/**
	 * 用户点击删除后的处理
	 */
	public ActionForward delete(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 删除数据库中记录
		OperateDB.deleteData( form );
		// 设置提示信息
		addMessage( request, "result", "category_delete_success" );
		return unspecified( mapping, form, request, response );
	}

	/**
	 * 用户点击更新后的处理
	 */
	public ActionForward update(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 得到用户要修改的记录
		Category category = (Category)OperateDB.getObjectByID( Category.class, ((Category)form).getId() );
		request.setAttribute( "category", category );
		// 设置提示信息
		addMessage( request, "result", "category_update_prompt" );
		return unspecified( mapping, form, request, response );
	}

	/**
	 * 用户点击保存后的处理
	 */
	public ActionForward store(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 保存用户提交的数据
		OperateDB.storeData( form );
		// 设置提示信息
		addMessage( request, "result", "category_store_success" );
		return unspecified( mapping, form, request, response );
	}

	/**
	 * 缺省的处理方法
	 */
	public ActionForward unspecified(ActionMapping mapping,
								ActionForm form,
								HttpServletRequest request,
								HttpServletResponse response)
								throws IOException, ServletException
	{
		// 得到所有的商品分类
		request.setAttribute( "categorys", ManageDB.getCategorys( ) );

		return mapping.findForward( "category" );
	}
}