springmvc checkboxes 回显问题

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**.javapubic String test(Model model,User user,HttpServletRequest request,HttpServletResponse response,String channel) {List<User> ctList = querylist(channel);        String s= tntProm.getDistributor();        List<String> list = new ArrayList<String>();        if(s!=null && !s.equals("")) {            String[] s = s.split(",");            for(String temp : s) {                if(temp != null &&temp.length() != 0){                    list.add(temp);                }            }        }Map<String, String> map_id = new HashMap<String, String>();        String tempId = "";        String tempName = "";        for(int i = 0;i<ctList.size();i++) {            tempId = String.valueOf(ctList.get(i).getUserId());            tempName = ctList.get(i).getRealName();            map_id.put(tempId,tempName);        }        //user是po对象，其中list是传到前台需要自动勾选的，而map是所有的复选框选项        user.setList(list);        model.addAttribute("user", user);        model.addAttribute("map", map_id);        return "/test/edit";}

.jsp<table >                    <tbody>                        <tr>                            <td>关键词：</td>                            <td><sf:input path="key" onfocus="this.blur()"/></td>                        </tr>                        <tr>                            <td>ID:</td>                            <td><sf:input path="id" id="id"/></td>                        </tr>                        <tr>                            <td><span>渠道：&nbsp;&nbsp;&nbsp;&nbsp;</span></td>                            <td><sf:checkboxes items="${map}" path="list" cssClass="required"/></td>                        </tr>                    </tbody>                </table>

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