@Action(
     value = "list_examroom",
     results = {
       @Result(
           type = "json",
           name = "success",
           params = {"contentType", "text/json"})
     })
 public String executes() {
   try {
     result.setList(examroombiz.page(result));
   } catch (Exception e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
   }
   return "success";
 }