bookaction.java

基于struts开发的网上书店系统。希望对大家有帮助。JSP JavaBean Struts

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package book;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/** 
 * MyEclipse Struts
 * Creation date: 09-19-2007
 * 
 * XDoclet definition:
 * @struts.action path="/bookAction" name="bookForm" input="/booklist.jsp" scope="request" validate="true"
 * @struts.action-forward name="bookshopping" path="/bookshopping.jsp"
 * @struts.action-forward name="booklist" path="/booklist.jsp"
 */
public class BookAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
	    //这个类用以处理booklist页面的数据

	    SeeDataBean obj=new SeeDataBean();
	    
	      BookForm bookform= ( BookForm) form;
	    
	    
	    //处理排序
	    String S="id";
	    
	    
	    //由于希望跳转到其它页面的时候再返回还是同样的排序，所以用一个会话记录排序字段
	    //在单页模式下，可以不需要用会话
	    
	    javax.servlet.http.HttpSession session=request.getSession();
	   
	    if (session.getAttribute("sort") != null)
	           S=session.getAttribute("sort").toString();

	    
	    if (request.getParameter("Sort") != null)
	    {
	       S=request.getParameter("Sort");
	       session.setAttribute("sort",S);
	    
	    }
	    

	    //页码
	    String P="0";
	        
	    //处理书名的模糊查询，在输入为空的时候，为全部数据
	    //同样，在多页模式下，使用了会话记录数据
	    
	    String W="id > 0";
	    
	        
	    if (session.getAttribute("where") != null)
	           W=session.getAttribute("where").toString();

	    
	    if (request.getParameter("Addwhere") != null)
	    {
	       //查询的时候首先需要使页码为零

	       P="0"; 
	       session.setAttribute("page",P);
	       String w=bookform.getWheretxt();
	       if (! w.equals(""))
	         W=" title like '%"+w+"%'";
	         else
	         W="id > 0";

	       session.setAttribute("where",W);
	           
	    }
	    
	    //下面的代码用以处理页码，首先需要从会话中得到原来的页码
	    //使用会话的原因和上面相同    

	     if (session.getAttribute("page") != null)
	           P=session.getAttribute("page").toString();

	    
	    if (request.getParameter("pnext") != null)
	    {
	       int p=Integer.parseInt(P);
	       int pmax=Integer.parseInt(request.getParameter("pmax").toString());
	       if (p<pmax)
	               p++;
	       P=String.valueOf(p);
	       session.setAttribute("page",P);
	    
	    }
	    
	     if (request.getParameter("pprev") != null)
	    {
	       int p=Integer.parseInt(P);
	       if (p>0)
	             p--;
	       P=String.valueOf(p);
	       session.setAttribute("page",P);
	    
	    }

	      //把三个信息的请求放进请求列表，传送给页面
	    
	     request.setAttribute("strquery", W);
	     request.setAttribute("strsort", S);
	     request.setAttribute("strpage", P);

	      //转向booklist
	      return (mapping.findForward("booklist"));
	  }
	}