Ajax传递json数据

$.ajax({
          url:"doindex.jsp",
          data:"email="+$("#email").val(),
          dataType:"text",
          timeout:1000,
          beforeSend:function(){
            alert('正在验证，请稍后......');
          },
          success:function(data){
            var data = $.parseJSON(data);
            $("#semail").html(data.msg);
          },
          complete:function(){
            alert('验证完成！');
          },
          error: function() {
            alert("ajax执行失败"); 
          }
        });

String email = request.getParameter("email");
  if("2451999120@qq.com".equals(email)){
    out.print("{\"flag\":true,\"msg\":\"<font color='red'>该邮箱已注册！</font>\"}");
  }else{
    out.print("{\"flag\":false,\"msg\":\"<font color='green'>可以使用！</font>\"}");
  }