一个JSP分页组件

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%><%--    /*        所有要接收的值为 currentPage，pageSize，allCount，URL    */    每次使用该组件时，修改page属性的值即可使用            <jsp:include flush="true" page="/emp/split_page.jsp">                <jsp:param name="currentPage" value="<%=currentPage %>"/>                <jsp:param name="pageSize" value="<%=pageSize %>"/>                <jsp:param name="allCount" value="<%=allCount %>"/>                <jsp:param name="url" value="list.jsp"/>                <jsp:param name="keyword" value="<%=keyword %>"/>                <jsp:param name="searchFlag" value="FALSE"/>            </jsp:include>                                <jsp:include flush="true" page="/split_page.jsp">            <jsp:param name="currentPage" value="${empForm.cp}" />            <jsp:param name="pageSize" value="${empForm.ps}" />            <jsp:param name="allCount" value="${allCount}" />            <jsp:param name="url"                value="${pageContext.request.contextPath}/emp.do?status=list" />            <jsp:param name="keyword" value="${empForm.kw}" />            <jsp:param name="searchFlag" value="TRUE" />        </jsp:include>        <input type="button" value="返回" onclick="history.back();"> --%><%int currentPage = 1;int pageSize = 5 ;int allCount = 0 ;String url = request.getParameter("url");String keyword = request.getParameter("keyword");String searchFlag = request.getParameter("searchFlag");try {    currentPage = Integer.parseInt(request.getParameter("currentPage"));    pageSize = Integer.parseInt(request.getParameter("pageSize"));    allCount = Integer.parseInt(request.getParameter("allCount"));} catch (Exception e) {}int allPage = (allCount - 1) / pageSize + 1 ; %>            <input type="button" value="首页" <%=currentPage==1?"disabled":"" %> onclick="changePage(1);">                <input type="button" value="上一页" <%=currentPage==1?"disabled":"" %> onclick="changePage(<%=currentPage-1 %>);">                <input type="button" value="下一页" <%=currentPage==allPage?"disabled":"" %> onclick="changePage(<%=currentPage+1 %>);">                <input type="button" value="尾页" <%=currentPage==allPage?"disabled":"" %> onclick="changePage(<%=allPage %>);">                                                                <form name="splitform" action="<%=url %>" method="post" onsubmit="return check(this);">                    <input type="submit" value="跳转到："><input type="text" name="cp" value="<%=currentPage %>" size="4"> / <%=allPage %> 页                    <%                        // 最好定义一个数组，保存所有的选项                        int[] allSelect = {2,5,10,20};                     %>                    每页显示 <select name="ps" onchange="changePage(1);">                        <%                            for (int i = 0; i < allSelect.length;i++) {                         %>                        <option value="<%=allSelect[i] %>" <%=pageSize == allSelect[i]?"selected":"" %>><%=allSelect[i] %></option>                        <%                            }                         %>                    </select>                    条数据 <br>                    <%                        if ("TRUE".equals(searchFlag)) {                     %>                    请输入查询关键字：<input type="text" name="keyword" value="<%=keyword %>"> <input type="submit" value="查询">                    <%                        }                     %>                </form>        <script type="text/javascript">            function check(myform) {                var cp = myform.cp.value ;                // 转换为数字类型                cp = parseInt(cp);                if (isNaN(cp)) {                    return false ;                } else {                    if (cp < 1 || cp > "<%=allPage%>") {                        return false ;                    }                                }                return true ;            }            function changePage(cp) {                // 接收传入的cp，并设置到隐藏的表单中。                document.splitform.cp.value = cp ;                // 提交表单                document.splitform.submit();            }        </script>