如果标记，我如何在struts2中使用请求参数

Question

i have a link like this : http://localhost:8080/ESA/login.jsp?login=failed in end of above link a set a parameter with name login and value failed .
how i can use this parameter in jsp page with struts if tag. I use following code but it don't work.

<s:if test="%{#parameters.login='failed'}">
    <div class="error">
        <s:text name="user.login.failed"></s:text>
    </div>
</s:if>

Answer 1

Try with

<s:if test="%{#parameters.login[0]=='failed'}">

The two problems were in your code:

1. The = sign is an assignment, not equals == ;

2. Parameters are saved in the Map<String, String[]> , so each parameter could have multiple values and accessed by the specifying an index.

   The last option also described here: why doesn't the if tag evaluate params properly .