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首先此异常是在 (源码解析)(解决方法在最后。。)
 

org.apache.shiro.session.mgt.eis.AbstractSessionDAO的readSession方法中抛出的异常

public Session readSession(Serializable sessionId) throws UnknownSessionException {
        Session s = doReadSession(sessionId);
        if (s == null) {
            throw new UnknownSessionException("There is no session with id [" + sessionId + "]");
        }
        return s;
    }

readSession方法 中会调用抽象类AbstractSessionDAO的子类RedisSessionDAO中的doReadSession方法,此方法是会先从本地获取session,获取失败后再从redis中获取session,如果redis中session失效,则返回null,导致抛出异常。所以,要避免此异常,则需要在session失效情况下防止此方法被调用。

 

org.apache.shiro.session.mgt.DefaultSessionManager中

protected Session retrieveSession(SessionKey sessionKey) throws UnknownSessionException {
    Serializable sessionId = getSessionId(sessionKey);
    if (sessionId == null) {
        log.debug("Unable to resolve session ID from SessionKey [{}].  Returning null to indicate a " +
                "session could not be found.", sessionKey);
        return null;
    }
    Session s = retrieveSessionFromDataSource(sessionId);
    if (s == null) {
        //session ID was provided, meaning one is expected to be found, but we couldn't find one:
        String msg = "Could not find session with ID [" + sessionId + "]";
        throw new UnknownSessionException(msg);
    }
    return s;
}

protected Serializable getSessionId(SessionKey sessionKey) {
    return sessionKey.getSessionId();
}

protected Session retrieveSessionFromDataSource(Serializable sessionId) throws UnknownSessionException {
    return sessionDAO.readSession(sessionId);
}

 

在此处调用了readSession,

因此Serializable sessionId = getSessionId(sessionKey);   这个方法会从sessionKey(shiro核心过滤器传入)获取sessionId

protected Serializable getSessionId(SessionKey sessionKey) {
    return sessionKey.getSessionId();
}

此方法被org.apache.shiro.web.session.mgt.DefaultWebSessionManager重写

@Override
public Serializable getSessionId(SessionKey key) {
    Serializable id = super.getSessionId(key);
    if (id == null && WebUtils.isWeb(key)) {
        ServletRequest request = WebUtils.getRequest(key);
        ServletResponse response = WebUtils.getResponse(key);
        id = getSessionId(request, response);
    }
    return id;
}

此方法返回null,说明客户端没有携带cookie,则shiro认为未认证,session失效即认证过期,

id = getSessionId(request, response);

protected Serializable getSessionId(ServletRequest request, ServletResponse response) {
    return getReferencedSessionId(request, response);
}
解决方法(~~~~~~~~~~~)
重写DefaultWebSessionManager 的 这个方法,代码如下
并在@Configuration 配置中将此类放入SecurityManager,securityManager.setSessionManager(sessionManager());
import org.apache.shiro.session.Session;
import org.apache.shiro.web.session.mgt.DefaultWebSessionManager;
import org.apache.shiro.web.util.WebUtils;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;

public class ShiroWebSessionManager extends DefaultWebSessionManager {
    @Override
    protected Serializable getSessionId(ServletRequest request, ServletResponse response) {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
       /* 此方法获取客户端cookie的值,如果你的项目将sesssionId放在requestparam中,或者拼接在url中,请查看该方法源码,自行修改*/
        String id = super.getSessionIdCookie().readValue(httpRequest, WebUtils.toHttp(response));
        if(id != null){
           /*此处并非http 的session,是shiro在redis中缓存的session(SimpleSession)*/
           /* 此方法是查询redis中的session,笔者在sessionDao中注入了redisManager如果你重写了RedisSessionDAO,则需要更改获取session的方法 */
            Session session = /*(Session)redis.get(id)*/;
            if(session == null){
                return null;
            }
        }
        /*   如果redis中session未过期,此处必须调用父类获取方法 */
        return super.getSessionId(request, response);
    }
}

本文标签: 异常shirobootSpringRedis