Struts2-权限拦截器

1、写一个权限监听类

 

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
import java.util.*;
public class UserLoginInterceptor extends AbstractInterceptor {
public String tip;
    public String getTip() {
return tip;
}
public void setTip(String tip) {
this.tip = tip;
}
public String intercept(ActionInvocation invocation) throws Exception
{
ActionContext ctx = invocation.getInvocationContext();
Map session = ctx.getSession();
User user =(User)session.get("User");
if (user != null)
{
return invocation.invoke();
}else{
ctx.put("tip" , "请登录！");
setTip("请登录！");
//return Action.LOGIN;
return "userLogin";
}
    }
}

第二步，写个struts2的配置文件，也就所谓的xml

 

<!DOCTYPE struts PUBLIC 
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <!-- 定义含“权限检查拦截器”的包，供其他模块引用 -->
    <package name="struts-default-with-auth-check" extends="struts-default" >
        <interceptors>            
            <!-- 定义“权限检查拦截器” -->
            <interceptor name="userCheck"
                class="com.interceptor.UserLoginInterceptor">
            </interceptor>  
                                   
            <!-- 定义含“权限检查拦截器”的拦截器栈，注意缺省的拦截器栈“defaultStack”要放在前面 -->
            <interceptor-stack name="userStack">
              <!--   <interceptor-ref name="defaultStack" />  -->
                <interceptor-ref name="userCheck"></interceptor-ref>
            </interceptor-stack>
              
        </interceptors>        
        <!-- 正式应用可能含很多package，为了能从其他package中跳转到登录页面，把登录页面定义成全局result
         <default-interceptor-ref name="userStack"></default-interceptor-ref>    
               -->
        <global-results>
            <result name="userLogin">login.jsp</result>
            <result name="adminLogin">login.jsp</result>
        </global-results>
    </package>
</struts>

第三步
其他的xml都继承这个xml
然后再xml的action中加入
 <interceptor-stack name="userStack"/>
就OK了