初始化后 条件怎么写！！

一个条件判断 因其条件不够严密 查询结果各种奇葩

前台freemarker 传来的参数

[@cms_infoCategory_FlagDirective count='3' recommend_flag='0'  show_category=‘1’ ]

后台

定义变量（因需要组合拼接）Action层

String show_category = "";

String show_category_s = "";

String show_compose = "";

String Comma = ",";

String recommend_flag = "";

if ((show_category != null && !show_category.equals(""))

&& (show_category_s != null) && !show_category_s.equals("")) {

show_compose = show_category + Comma + show_category_s;

}

 

DAOimpl

if(!recommend_flag.equals("")){

f.append(" and (bean.recommend_flag='"+recommend_flag+"')");

}

if(!show_compose.equals(""))

{

f.append(" and (bean.show_category like '%"+show_compose+"%')");

}

DAOimpl中因前段Freemaker传过来的参数初始化为空字符，所有肯定就不是null ，就只需做空字符判断，