struts2自定义Interceptor基本使用

public class MyInterceptor extends com.opensymphony.xwork2.interceptor.Interceptor{
	
	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
//<action name="xxx" class="yyy" method="zzz">
		String namespace_action = invocation.getProxy().getNamespace();//命名空间
		String actionName_action = invocation.getProxy().getActionName();//action名字xxx
		String method_action = invocation.getProxy().getMethod();//method名字zzz

		ActionContext context = invocation.getInvocationContext();
		Map<String, Object> session = context.getSession();
		
		HttpServletRequest request = (HttpServletRequest) invocation
				.getInvocationContext().get(StrutsStatics.HTTP_REQUEST);
		HttpServletResponse response = (HttpServletResponse) invocation
				.getInvocationContext().get(StrutsStatics.HTTP_RESPONSE);
	}

}

 

 

 

下面是一个处理同一账号只能在一个地方登陆的拦截器简单实现：

 

package com.tch.test.ssh.interceptor;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.StrutsStatics;
import org.springframework.stereotype.Component;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
import com.tch.test.ssh.entity.User;
import com.tch.test.ssh.info.LoginInfo;
import com.tch.test.ssh.info.UserInfo;
@Component("checkLogin")
public class CheckLoginInterceptor implements Interceptor {
	private static final long serialVersionUID = 1L;

	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		System.out.println("interceptor............................");
		HttpServletRequest request = (HttpServletRequest) invocation.getInvocationContext().get(StrutsStatics.HTTP_REQUEST);  
		String url = request.getRequestURI();
		if(url.contains("/ssh/login.action")){
			//登陆
			return invocation.invoke();
		}
		//已经登陆
		HttpSession session = request.getSession();
		Date current_login_time = (Date) session.getAttribute("login_time");//一个账号登陆之后会在session中保存此次登陆的时间
		User user = (User) session.getAttribute("login_user");
		if(user == null || user.getId() == null || current_login_time == null){
			//session中没有相关信息，则重新登录
			return "login";
		}
		LoginInfo info = (LoginInfo)UserInfo.LOGIN_USERS.get(user.getId());//账号登陆之后，会在服务器端保存该账号的登录时间，当有另外一个登陆的时候，会更新该时间，从而保证是最近的登陆时间
		if(info != null && info.getLoginTime() != null){
			Date latest_login_time = info.getLoginTime();
			if(latest_login_time.getTime() > current_login_time.getTime()){//比较session中的登录时间和服务器保存的登录时间，确定该登陆是否是最新的登陆
				ActionContext.getContext().put("errorMessage", "账号在别处登录，当前用户被强制退出 !");
				session.invalidate();
				System.out.println("*****************删除session*************");
				return "error";
			}
		}
		return invocation.invoke();
	}

	@Override
	public void destroy() {
	}

	@Override
	public void init() {
	}
}

 

然后再struts.xml中配置该拦截器：

 

<?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.enable.DynamicMethodInvocation" value="true" />
	<constant name="struts.devMode" value="true" />
	<!-- 定义一个自己的package，在里面定义拦截器栈，后面的package继承该package即可使用里面的拦截器 -->
	<package name="mypackage" extends="struts-default">
		<interceptors>
			 <interceptor name="checkLogin" class="checkLogin"></interceptor>
			 <interceptor-stack name="myStack">
		              <interceptor-ref name="checkLogin"/>
		              <interceptor-ref name="defaultStack"/>
		     </interceptor-stack>
		</interceptors>
                <!--  设置默认的拦截器栈为自定义的拦截器栈，这样就可以对所有的请求拦截处理了  -->
		<default-interceptor-ref name="myStack"/>
	</package>
	<package name="default" namespace="/" extends="mypackage">
		<default-action-ref name="index" />
		<global-results>
			<result name="error">/user/pages/loginError.jsp</result>
			<result name="login">/index.jsp</result>
		</global-results>
		<global-exception-mappings>
			<exception-mapping exception="java.lang.Exception"
				result="error" />
		</global-exception-mappings>
		<action name="show" class="userAction" method="select">
			<result>/WEB-INF/pages/User.jsp</result>
		</action>
		<action name="goEdit" class="userAction" method="goEdit">
			<result>/WEB-INF/pages/editUser.jsp</result>
		</action>
		<action name="login" class="userAction" method="login">
			<result>user/pages/all.jsp</result>
			<result name="error">/user/pages/loginError.jsp</result>
		</action>
		<!-- 使用通配符 -->
		<action name="*User" class="userAction" method="{1}User">
			<result type="redirectAction">
				<param name="actionName">show</param>
				<param name="namespace">/</param>
			</result>
		</action>
	</package>
</struts>