批量剔除不了呢！求解求解！_J2SE

批量删除不了呢！求解求解！！！
jsp页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>员工管理信息</title>
<style type="text/css">

</style>
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(function(){

$("#fanhui").click(function(){
window.location.href= "../show.jsp";
});
$("#add").click(function(){
window.location.href= "add.jsp";
});
$("#update").click(function(){
window.location.href= "mod.jsp";
});
$("#del").click(function(){
window.location.href= "del.action";
});
$("#select").click(function(){
window.location.href= "sel.jsp";
});

$(document).ready(function() {
$("tr:odd").css({background: "#cccccc"});
$("tr:even").css({background: "#FFFFFF"});
});

$("#delAll").click(function(){
var str="";
var sel=document.getElementsByName("check"); //获取checkbox的值
for( var i=0;i<sel.length;i++)

if(sel[i].checked==true){
if(str == "")
str += sel[i].value;
else
str += ","+sel[i].value;

if(window.confirm("确定删除吗？")){
window.location.href= "delAll.action?id="+str;
}
}
alert(str);
if(str==""){
alert("请至少选择一条记录");
return false;
}

});

});

</script>
</head>
<body>
<center>
<table width="830" height="139" border="1">
<tr>
<td height="52" colspan="10"><div class="STYLE2">员工管理信息</div></td>
</tr>
<tr>
<td width="63"> </td>
<td width="64" height="36"><strong>员工ID</strong></td>
<td width="69"><strong>员工姓名</strong></td>
<td width="74"><strong>员工密码</strong></td>
<td width="74"><strong>员工性别</strong></td>
<td width="77"><strong>员工电话</strong></td>
<td width="74"><strong>员工地址</strong></td>
<td width="72"><strong>出生日期</strong></td>
<td width="74"><strong>员工简介</strong></td>
<td width="83"><div align="center"><strong>操作</strong></div></td>
</tr>
<s:iterator value="list" >
<tr>
<td align="right"><input type="checkbox" name="check" value=<s:property value="id"/> ></td>
<td><s:property value="id"/></td>