WS查询所有2

       if(null == (lists.get("CONTRACT_NO"))
                    ||"null".equals(lists.get("CONTRACT_NO"))
                    ||"".equals(lists.get("CONTRACT_NO")))
            {
                lists.remove("CONTRACT_NO");
                lists.put("CONTRACT_NO", "");
            }
            if(null == (lists.get("PO_NO"))
                    ||"null".equals(lists.get("PO_NO"))
                    ||"".equals(lists.get("PO_NO")))
            {
                lists.remove("PO_NO");
                lists.put("PO_NO", "");
            }
            if(null == (lists.get("PRODUCT_LINE_NAME"))
                    ||"null".equals(lists.get("PRODUCT_LINE_NAME"))
                    ||"".equals(lists.get("PRODUCT_LINE_NAME")))
            {
                lists.remove("PRODUCT_LINE_NAME");
                lists.put("PRODUCT_LINE_NAME", "");
            }