JSP一些标签, 对应的 java代码

1.
<jsp:useBran id="cb" class="bean.CounterBean" >
</jsp:useBean>
对应代码： <%CounterBean cb = new CounterBean();%>
2.
<jsp:setProperty name ="cb" property="count" value = "23"/> 对应代码：
<%-- cb.setCount(Integer.paseInt("23"))- -%>
3.
<jsp:setProperty name ="cb" property="count" 对应代码：
<%--  out.print(cb.getCount())--%>
4.(重点) <jsp:useBean  id = "counterBean"
                                    scope = "request"
                                    class = "bean.CounterBean" />
对应代码：
<% bean.CouterBean counterBean = (bean.CouterBean)request.getAttribute("counterBean");
if(counterBean = null){
  counterBean = new bean.CounterBean();
  request.SetAttribute("counterBean",counterBean)