如何使用Struts 2检查List是否包含特定元素为null <s:if> 标签？

Question

I have an action in Struts 2, I want to test whether email ID is empty or null using <s:if> test condition in JSP.

class EmailAction extends ActionSupport  {
      private ArrayList<Email> emailList;
      //setter and getters
}

class Email   {
     private String username;
     Private String password;
     private String emailId;
     //getters and setters
}

Answer 1

您应该为emailId提供getter

<s:if test="emailId == null || emailId == ''">