请教 jsp传参数给 action 出现404错误

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请教 jsp传参数给 action 出现404错误20

<input type="button" value="修改"
onclick="document.location='editOrderline?lineid='+${lis.book.id}+'&num='+num.value" />

和

<html:button property="button" onclick="document.location='editOrderline'+${book.id}+'&num='+num.value">
<bean:message key="list.tslb" />
</html:button>

都没有好使
求教那里有问题
谢谢了

问题补充：
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.briup.web.servlet;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;

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 com.briup.bean.Orderline;
import com.briup.bean.ShoppingCart;

/**
* MyEclipse Struts Creation date: 05-29-2008
*
* XDoclet definition:
*
* @struts.action validate="true"
*/
public class EditOrderlineAction 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) {
// TODO Auto-generated method stub
HttpSession session = request.getSession();
ShoppingCart cart = (ShoppingCart) session.getAttribute("cart");
String lineid = request.getParameter("lineid");
System.out.println("lineid=" + lineid);
String num = request.getParameter("num");
Orderline orderline = cart.getOrderline(Integer.parseInt(lineid));
orderline.setNum(Integer.parseInt(num));
// 为了购物车利用struts,jsp的标签库的使用将listcart.jsp改成标签库
List<Orderline> list = (List) session.getAttribute("list");
Iterator it = list.iterator();
while (it.hasNext()) {
list.remove(0);
}
Collection c = cart.getOrderlines();
Iterator iter = c.iterator();
while (iter.hasNext()) {
Orderline orderline1 = (Orderline) iter.next();
list.add(orderline1);
}

session.setAttribute("list", list);

return new ActionForward("/listCart.jsp");

}
}

Struts