public boolean isEmptyDataString() {
        if (exception != null) return true;
        if (getDataString() == null || dataString.length() == 0) {
            return true;
        }
        return false;
    }
public boolean isEmptyDataString ( ) { if ( exception != null ) return true ; if ( getDataString ( ) == null || dataString . length ( ) == 0 ) { return true ; } return false ; }
判断返回数据是否为空

@return