JAVA验证

保存前的验证信息。
/*******************************************************************************
 *
 * @author Administrator 验证单位是否有下属单位
 */
public class OrgValidator implements Validator {
 public String validate(ActionContext ac, String value, String expression,
   int rowIndex) {
  // TODO Auto-generated method stub
//  String lower = "";
  try {
   DB db = DBFactory.getDB();
   MapList orglist = db
     .query("select lowerid from aorglevel where upperid ='" + value
       + "'");
   if (Checker.isEmpty(orglist)) {
    return null;
   }
    else {
    return "本单位有下属单位，请选择下属单位";
   }
  }catch (Exception e){
   System.out.println("error validate");
   return "error";
  }
  
 }

 public String validate(ActionContext arg0, String arg1, String arg2,
   String arg3) {
  // TODO Auto-generated method stub
  return null;
 }

}