jsp使用

1.解决用户浏览器缓存问题，前台在jsp中使用request

<%
  request.setCharacterEncoding("utf-8");
  request.setAttribute("path",request.getContextPath());
  request.setAttribute("cssVersion",1);
  request.setAttribute("jsVersion",6);
//要用到js地方使用 通过版本保证更新
<script type="text/javascript" src="${path}/js/reim/expense.js?${jsVersion}"></script>

  request.setAttribute("title","GIP");
  request.setAttribute("vEnter", "\n");
  request.setAttribute("USER_TYPE_ADMIN", 99);
  request.setAttribute("USER_TYPE_MARKET_MANAGER", 20);
  request.setAttribute("USER_TYPE_MARKET", 22);
  request.setAttribute("USER_TYPE_PARTNER", 9);
%>

2.提交表单之前验证某些选项方法

<form class="form-horizontal" action="${path}/reim/submitTask.d" onsubmit="return checkForm();" method="POST">
            <input type="hidden" name="type" value="2">
            <input type="hidden" name="taskId" value="${taskId}">
 <input class="btn blue" type="submit" name="outcome">
</form>
//通过点击事件方法进行验证
<script>
    function checkForm(){
        var comment = $('#comment').val();
        if(comment == ''){
            alert('请输入备注说明！');
            return false;
        }
        return true;
    }
</script>

3. jsp通过js获取后台传给前台的值

后台传给前台的方法

String rulemodeid=req.getParameter("rulemodeid");
req.setAttribute("rulemodeid", rulemodeid);

前台js的方法

var rulemodeid= "${rulemodeid }";

其中“”是必须加的，不然报defined错

 checkbo根据后台参数选中

<div class="layui-input-block"  required lay-verify="required">
            <input type="checkbox" name="size" title="XS" value="XS" >
            <input type="checkbox" name="size" title="S" value="S">
            <input type="checkbox" name="size" title="M"  value="M">
            <input type="checkbox" name="size" title="L" value="L">
            <input type="checkbox" name="size" title="XL" value="XL">
            <input type="checkbox" name="size" title="XXL" value="XXL">
            <input type="checkbox" name="size" title="XXXL" value="XXXL">
</div>



<script>
    var str= "${size}";
    $(str.split(",")).each(function (i,e){
        $("input[name='size'][value='"+e+"']").prop("checked",true);
    });
</script>