apache shiro分布式session共享实战（redis版）

源码下载：http://pan.baidu.com/s/1ntD0BwP

1、原理

     所有session集中管理，根据sessionId做标识，session对象用objectStream做序列化，缓存到redis中

2、环境搭建

     ①配置jdk7、gradle2.2.1、redis3.0.4环境；

     ②在java代码中配置org.demo.shiro.rediscache.RedisClient.redisServerIp

3、运行shiro-redis-session\gradle-jettyRun.bat（不用打开eclipse）

4、关键代码分析（重写shiro的会话dao）

package org.demo.shiro.rediscache;

import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;

import org.apache.shiro.session.Session;
import org.apache.shiro.session.UnknownSessionException;
import org.apache.shiro.session.mgt.eis.AbstractSessionDAO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RedisSessionDao extends AbstractSessionDAO {
	private RedisClient sessionCacheClient=new RedisClient();

	Logger log= LoggerFactory.getLogger(getClass());
	@Override
	public void update(Session session) throws UnknownSessionException {
		log.info("更新seesion,id=[{}]",session.getId().toString());
		 try {  
	            sessionCacheClient.replace(session.getId().toString(), session);  
	        } catch (Exception e) {  
	           e.printStackTrace(); 
	        }  
	}

	@Override
	public void delete(Session session) {
		log.info("删除seesion,id=[{}]",session.getId().toString());
		 try {  
	            sessionCacheClient.delete(session.getId().toString());  
	        } catch (Exception e) {  
	           e.printStackTrace(); 
	        }  
		
	}

	@Override
	public Collection getActiveSessions() {
		log.info("获取存活的session");
		 return Collections.emptySet(); 
	}

	@Override
	protected Serializable doCreate(Session session) {
		Serializable sessionId = generateSessionId(session);  
        assignSessionId(session, sessionId);  
        log.info("创建seesion,id=[{}]",session.getId().toString());
        try {  
            sessionCacheClient.set(sessionId.toString(),  session);  
        } catch (Exception e) {  
            log.error(e.getMessage());  
        }  
        return sessionId;  
	}

	@Override
	protected Session doReadSession(Serializable sessionId) {
		
		log.info("获取seesion,id=[{}]",sessionId.toString());
		Session session = null;  
        try {  
            session = (Session) sessionCacheClient.get(sessionId.toString());  
        } catch (Exception e) {  
            log.error(e.getMessage());  
        }  
        return session;  
	}
}

package org.demo.shiro.rediscache;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.apache.shiro.codec.Base64;
import org.apache.shiro.session.Session;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class RedisClient {

	private static JedisPool pool;
	private static String redisServerIp="124.193.90.xx";

	/**
	 * 建立连接池 真实环境，一般把配置参数缺抽取出来。
	 * 
	 */
	private static void createJedisPool() {

		// 建立连接池配置参数
		JedisPoolConfig config = new JedisPoolConfig();

		// 设置最大连接数
		config.setMaxActive(1000);

		// 设置最大阻塞时间，记住是毫秒数milliseconds
		config.setMaxWait(1000);

		// 设置空间连接
		config.setMaxIdle(10);

		// 创建连接池
		pool = new JedisPool(config, redisServerIp, 6379);

	}

	/**
	 * 在多线程环境同步初始化
	 */
	private static synchronized void poolInit() {
		if (pool == null)
			createJedisPool();
	}

	/**
	 * 获取一个jedis 对象
	 * 
	 * @return
	 */
	private static Jedis getJedis() {

		if (pool == null)
			poolInit();
		return pool.getResource();
	}

	/**
	 * 归还一个连接
	 * 
	 * @param jedis
	 */
	private static void returnRes(Jedis jedis) {
		pool.returnResource(jedis);
	}

	void set(String sessionId, Session session) {
		jedis = getJedis();
		jedis.append(sessionId, serialize(session));
		returnRes(jedis);
	}

	void replace(String sessionId, Session session) {
		set(sessionId, session);

	}

	Jedis jedis = null;

	void delete(String sessionId) {
		jedis = getJedis();
		jedis.del(sessionId);
		returnRes(jedis);
	}

	Object get(String sessionId) {
		jedis = getJedis();
		Object obj = deserialize(jedis.get(sessionId));
		returnRes(jedis);
		return obj;
	}

	private static Object deserialize(String str) {
		ByteArrayInputStream bis = null;
		ObjectInputStream ois = null;
		try {
			bis = new ByteArrayInputStream(Base64.decode(str));
			ois = new ObjectInputStream(bis);
			return ois.readObject();
		} catch (Exception e) {
			throw new RuntimeException("deserialize session error", e);
		} finally {
			try {
				ois.close();
				bis.close();
			} catch (IOException e) {
				e.printStackTrace();
			}

		}
	}

	private static String serialize(Object obj) {
		ByteArrayOutputStream bos = null;
		ObjectOutputStream oos = null;
		try {
			bos = new ByteArrayOutputStream();
			oos = new ObjectOutputStream(bos);
			oos.writeObject(obj);
			return Base64.encodeToString(bos.toByteArray());
		} catch (Exception e) {
			throw new RuntimeException("serialize session error", e);
		} finally {
			try {
				oos.close();
				bos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}

		}
	}

}

5、上图：