在action封装数组，将其传到jsp页面，以checkbox形式显示

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  HTML code<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<%
     String path = request.getContextPath();
     String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'demo.jsp' starting page</title>
    <script type="text/javascript">
        function test(){
            var checkBoxs = document.getElementsByName("cb1");
            <c:forEach items="${arr}" var="myarr">
                for(var i=0;i<checkBoxs.length;i++){
                    if(checkBoxs[i].value=='${myarr}'){
                        checkBoxs[i].checked=true;
                    }
                }
              </c:forEach>
        }
        window.onload=function(){
            test();
        }
    </script>

</head>

<body>

        jsp页面中有几个checkbox
        <input type="checkbox" name="cb1" value="a">a
        <input type="checkbox" name="cb1" value="b">b
        <input type="checkbox" name="cb1" value="c">c
        <input type="checkbox" name="cb1" value="d">d
        <br>
        
</body>
</html>
后台：
public ActionForward demo(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        String[] arr = { "a", "b", "c" };
        request.setAttribute("arr", arr);
        return mapping.findForward("test");
}