struts2拦截器配置;拦截器栈;配置默认拦截器;拦截方法的拦截器MethodFilterInterceptor;完成登录验证

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

<constant name="struts.devMode" value="true" />
<constant name="struts.custom.i18n.resources" value="msg"></constant>
<constant name="struts.action.extension" value="action,free"></constant>
<package name="test1" extends="struts-default" abstract="true">
<interceptors>
<!--用于显示拦截器的生命周期和调用时间        -->
<interceptor name="i1" class="com.free.Interceptor.MyInterceptor">
</interceptor>

<interceptor name="i2"
class="com.free.Interceptor.MethodIntercepter">

</interceptor>

<interceptor-stack name="my1">
<!--这里引入struts里面的默认拦截器            -->
<interceptor-ref name="i2">
<!--    login方法不用拦截            -->
<param name="excludeMethods">login</param>
</interceptor-ref>
<interceptor-ref name="exception" />
<interceptor-ref name="alias" />
<interceptor-ref name="servletConfig" />
<interceptor-ref name="i18n" />
<interceptor-ref name="prepare" />
<interceptor-ref name="chain" />
<interceptor-ref name="scopedModelDriven" />
<interceptor-ref name="modelDriven" />
<interceptor-ref name="fileUpload" />
<interceptor-ref name="checkbox" />
<interceptor-ref name="multiselect" />
<interceptor-ref name="staticParams" />
<interceptor-ref name="actionMappingParams" />
<interceptor-ref name="params">
<param name="excludeParams">dojo\..*,^struts\..*,^session\..*,^request\..*,^application\..*,^servlet(Request|Response)\..*,parameters\...*</param>
</interceptor-ref>
<interceptor-ref name="conversionError" />
<interceptor-ref name="validation">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
<interceptor-ref name="debugging" />
<interceptor-ref name="i1">

</interceptor-ref>

</interceptor-stack>

</interceptors>
<!--配置该包的默认拦截器，且每个包只能指定一个默认拦截器        -->
<default-interceptor-ref name="my1">

</default-interceptor-ref>
</package>

<package name="test4" extends="test1">
<action name="delete" class="com.free.Action.loginAction"
method="delete">
<result>/success.jsp</result>
<result name="login">/login1.jsp</result>

</action>
<action name="add" class="com.free.Action.loginAction" method="save">
<result>/success.jsp</result>
<result name="login">/login1.jsp</result>

</action>
<action name="login1" class="com.free.Action.loginAction"
method="login">
<result>/admin1.jsp</result>
<!-- 若出现错误，则转入login1.jsp，就是重新登录        -->
<result name="login">/login1.jsp</result>
</action>

</package>
</struts>

package com.free.Action;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class loginAction extends ActionSupport {
public String save() {
System.out.println("save");
return SUCCESS;
}

public String delete() {
System.out.println("delete");
return SUCCESS;
}

public String login() {
System.out.println("login方法");

//这里要创立一个标记,建立session
HttpSession _Session = ServletActionContext.getRequest().getSession();
_Session.setAttribute("user", "user");
return SUCCESS;
}
}

package com.free.Interceptor;

import java.awt.Desktop.Action;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.free.testDemo.action1;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
//import com.opensymphony.xwork2
public class MethodIntercepter extends MethodFilterInterceptor {

//    方法拦截器，对于要拦截的方法，放行or不放行
@Override
protected String doIntercept(ActionInvocation invocation) throws Exception {
HttpSession session = ServletActionContext.getRequest().getSession();
//判断有误登录标记,有：放行；没有：返回登录的逻辑页面
Object attribute = session.getAttribute("user");
if(attribute !=null) {
System.out.println("检测到了session放行");
return invocation.invoke();
} else {
System.out.println("没有检测到session，转入登录页面");
return com.opensymphony.xwork2.Action.LOGIN;

}

}

}