public class IfTag extends SimpleTagSupport {

         private boolean test;

         public void setTest(boolean test) {

                   this.test = test;

         }

         @Override

         public void doTag() throws JspException, IOException {

                   // TODO Auto-generated method stub

                   if(test)//如果有EL表示式就會先執行

                            this.getJspBody().invoke(null);

                   else

                            super.doTag();

         }

}