JavaWeb实现统一查询接口的方法

import com.jfinal.plugin.activerecord.Page;
public interface QueryService<T> {
  Page<T> getById(String id, String flag);
  Page<T> getByKey(int page, int pageSize, String value, String flag);
}

@NotAction
static <T> Page<T> query(QueryService<T> service,Controller controller, String key, String value, String flag, int page, int pageSize) {
  value = value == null &#63; "" : value;
  Page<T> list;
  if ("id".equals(key)) {
    list = service.getById(value, flag);
  } else if ("key".equals(key)) {
    list = service.getByKey(page, pageSize, value, flag);
  } else {
    list = null;
  }
  if (list == null) {
    controller.renderJson("result", "{'code':'203','info':'unknown key'}");
  } else {
    controller.renderJson("result", "{'code':'103','info':" + Json.getJson().toJson(list) + "}");
  }
  return list;
}