重定向到Struts 2中的拦截器中的另一个动作 [英] Redirect to another action in an interceptor in struts 2

问题描述

我目前正在学习Struts 2，目前正在构建一个简单的应用程序，将未经验证的用户重定向到登录表单.

I am currently in the process of learning Struts 2 and I am currently building a simple application where unverified users are redirected to a login form.

我有一个登录表单和操作功能，该功能可获取用户凭据，对其进行验证并将其存储在会话中，但是我现在试图在登录之前阻止访问页面，并且我试图这样做带有拦截器.

I have a login form and action functional which takes the users credentials, verifies them and stores a User object in the session however I am now trying to prevent access to pages before the login has taken place and I am trying to do this with an interceptor.

我的问题是我编写了一个拦截器，用于检查User对象是否已保存在会话中，但是如果没有保存，我想重定向到登录页面，并且在不绕过struts的情况下找不到任何方法并使用HttpServletResponse.sendRedirect方法

My problem is that I have written an interceptor that checks whether the User object has been saved in the session but if it has not I want to redirect to the login page and can't find any way of doing this without bypassing struts and using the HttpServletResponse.sendRedirect method

配置:

<package name="mypackage" extends="struts-default" namespace="/admin">

    <interceptors>
        <interceptor name="login" class="my.LoginInterceptor" />
    </interceptors>

    <default-interceptor-ref name="login"/>

    <action name="login" class="my.LoginAction">
        <result name="input">/admin/login.jsp</result>
        <result name="success" type="redirect">/admin</result>
    </action>

    <action name="private" class="my.PrivateAction">
        <result>/admin/private.jsp</result>
    </action>

</package>

拦截器代码:

@Override
public String intercept(ActionInvocation inv) throws Exception {

    Map<String, Object> session = inv.getInvocationContext().getSession();

    Object user = session.get("user");
    if(user == null) {

                      // redirect to the 'login' action here            

    }
    else {
        return inv.invoke();
    }

}

推荐答案

标准方法是返回特殊的全局结果(例如" login ")并定义从该结果到您的全局映射admin/login.jsp.因此，您只需添加以下行:

The standard way is to return a special global result (eg "login") and define a global mapping from that result to your admin/login.jsp. So you just must add this line:

if(user == null) {
      return "login";
}

在您的struts.xml中:

<global-results>
   <result name="login">/admin/login.jsp</result>
</global-results>

顺便说一句，恐怕您是用单个拦截器替换默认的Struts2拦截器堆栈，通常您想将拦截器 add 添加到堆栈中.例如:

BTW, I'm afraid that you are replacing the default Struts2 interceptor stack with your single interceptor, normally you want to add your interceptor to the stack. Eg:

<interceptors>
 <interceptor name="login" class="my.LoginInterceptor" />

 <interceptor-stack name="stack-with-login">
  <interceptor-ref name="login"/>
  <interceptor-ref name="defaultStack"/>
 </interceptor-stack>
</interceptors>
<default-interceptor-ref name="stack-with-login"/>

BTW2:当然，您不得将拦截器应用于登录操作.

BTW2: You must NOT apply the interceptor to your login action, of course.

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