sturts2 拦截器的设置

sturts2 需要加一个拦截器在action中做登录验证校验，主要的思想是登录后在session中存储一个标志，然后在过滤器中验证这个标志，如果有则通过验证。如果没有，则返回到登录页面。

过滤器代码如下，我把标志就设置为username，需要修改的同学自己改名字

package com.tc.blacktea.util;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.ServletRedirectResult;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class LoginInterceptor implements Interceptor {
	private static final long serialVersionUID = -2255797147687651066L;
	private static final Log log = LogFactory.getLog(LoginInterceptor.class);
	public String intercept(ActionInvocation invocation) throws Exception {
		final ActionContext context = invocation.getInvocationContext();
		HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);
		HttpSession session = request.getSession();
		String username=(String)session.getAttribute("username");
		if (username == null) {
			ServletRedirectResult result = new ServletRedirectResult();
			result.setLocation("/toLogin.action");
			try {
				result.execute(invocation);
			} catch (Exception ex) {
				log.error("Unable to create debugging console", ex);
			}
			return Action.NONE;
		}
		return invocation.invoke();
	}

	public void destroy() {

	}

	public void init() {

	}
	
}

在struts的总配置文件struts.xml里增加对拦截器的引用

<package name="blakctea-default" extends="struts-default">
<interceptors>
 <interceptor name="loginInterceptor" class="com.tc.blacktea.util.LoginInterceptor">
 <param name="loginActionName">/login.action</param>
 </interceptor>
</interceptors>
</package>

注意这个package的name，在需要引入这个拦截器的action的配置文件中，首先要extends这个package的name，然后在action中<interceptor-ref >引入拦截器

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
		<package name="advstoreclass" extends="blacktea-defalut" namespace="/advstoreclass">

		<action name="storeclass" class="com.tc.blacktea.adv.action.StoreClassAction">
			<!-- 定义转发路径对应的字符串名 -->
			<result name="success">/jsp/storeclass/storeclasslist.jsp</result>
			<result name="queryOne">/jsp/storeclass/storeclass.jsp</result>
			<interceptor-ref name="loginInterceptor"></interceptor-ref>
		</action>
	</package>
</struts>    

此时拦截器已经被引入，注意到我们的拦截器类中

result.setLocation("/toLogin.action");

这句话,所以要有一个配置文件和类专门处理toLogin这个action

新建一个struts-login.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
	<package name="toLogin" namespace="/" extends="struts-default">
		<action name="toLogin" class="com.tc.blacktea.login.action.LoginAction" method="toLogin">
			<result>/jsp/index.jsp</result>
		</action>
	</package>
</struts>

对应的class需要新建一个LoginAction来做跳转

package com.tc.blacktea.login.action;

import com.tc.blacktea.util.BaseAction;

public class LoginAction  extends BaseAction  {
 
	private static final long serialVersionUID = 5555663601912656942L;

	public  String toLogin(){
		return SUCCESS;
	}
}

大功告成。1.需要注意我的登录页面是在jsp/index.jsp下以此对应了sturts-login.xml。同时登录成功后，要在session中放入username这个属性。

Map session=(Map)ActionContext.getContext().get(ActionContext.SESSION);
		session.put("username", username);