ssm+redis的工具类

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JedisUtil.java

package cn.ssm.utils;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;public class JedisUtil {    private static String ADDR = "127.0.0.1";    private static int PORT = 6379;    private static String AUTH ;        private static int MAX_ACTIVE = 100;        private static int MAX_IDLE = 20;        private static int MAX_WAIT = 10000;        private static int TIMEOUT = 10000;        private static boolean TEST_ON_BORROW = true;        private static JedisPool jedisPool = null;        static {        try{            JedisPoolConfig config = new JedisPoolConfig();            config.setMaxIdle(MAX_IDLE);            config.setMaxTotal(MAX_ACTIVE);            config.setMaxWaitMillis(MAX_WAIT);            config.setTestOnBorrow(TEST_ON_BORROW);            jedisPool = new JedisPool(config,ADDR,PORT,TIMEOUT,AUTH);        }catch (Exception e) {            e.printStackTrace();        }    }        public synchronized static Jedis getJedis(){        try{            if(jedisPool != null){                Jedis jedis = jedisPool.getResource();                return jedis;            }else{                return null;            }        }catch (Exception e) {            e.printStackTrace();            return null;        }    }    public static void returnResource(final Jedis jedis){        if(jedis != null){        //jedisPool.returnResource(jedis);        jedisPool.close();        }    }// 出现异常释放资源  public synchronized void returnBrokenResource(Jedis jedis) {      if (jedis != null) {        //jedisPool.returnBrokenResource(jedis);          jedisPool.close();    }  }  }

SerializeUtil.java

package cn.ssm.utils;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;/** *  * @Description: 序列化反序列化工具 */public class SerializeUtil {    /**     *      * 序列化     */    public static byte[] serialize(Object obj){                ObjectOutputStream oos = null;        ByteArrayOutputStream baos = null;                try {            //序列化            baos = new ByteArrayOutputStream();            oos = new ObjectOutputStream(baos);                        oos.writeObject(obj);            byte[] byteArray = baos.toByteArray();            return byteArray;                    } catch (IOException e) {            e.printStackTrace();        }            return null;    }        /**     *      * 反序列化     * @param bytes     * @return     */    public static Object unSerialize(byte[] bytes) {        if(bytes!=null){        ByteArrayInputStream bais = null;                try {            //反序列化为对象            bais = new ByteArrayInputStream(bytes);            ObjectInputStream ois = new ObjectInputStream(bais);            return ois.readObject();                    } catch (Exception e) {            e.printStackTrace();        }        }        return null;    }}

RedisCache.java

package cn.ssm.cache;import java.util.concurrent.locks.ReadWriteLock;import java.util.concurrent.locks.ReentrantReadWriteLock;import org.apache.ibatis.cache.Cache;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import cn.ssm.utils.*;/* * 使用第三方缓存服务器，处理二级缓存 */public class RedisCache implements Cache {    private static Logger logger = LoggerFactory.getLogger(RedisCache.class);     /** The ReadWriteLock. */     private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();         private String id;         public RedisCache(final String id) {          if (id == null) {            throw new IllegalArgumentException("Cache instances require an ID");        }        logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>MybatisRedisCache:id="+id);        this.id = id;    }           public String getId() {        return this.id;    }     public void putObject(Object key, Object value) {        logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>putObject:"+key+"="+value);        JedisUtil.getJedis().set(SerializeUtil.serialize(key.toString()), SerializeUtil.serialize(value));        //JedisUtil.getJedis().set(SerializeUtil.serialize(key.toString()),SerializeUtil.serialize(value));    }     public Object getObject(Object key) {        Object value = SerializeUtil.unSerialize(JedisUtil.getJedis().get(SerializeUtil.serialize(key.toString())));        //Object value = SerializeUtil.unserialize(JedisUtil.getJedis().get(SerializeUtil.serialize(key.toString())));        logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>getObject:"+key+"="+value);        return value;    }     public Object removeObject(Object key) {        return JedisUtil.getJedis().expire(SerializeUtil.serialize(key.toString()),0);    }     public void clear() {        JedisUtil.getJedis().flushDB();    }     public int getSize() {        return Integer.valueOf(JedisUtil.getJedis().dbSize().toString());    }     public ReadWriteLock getReadWriteLock() {        return readWriteLock;    }}

注意：在反序列化时一定要判断byte [] 数组是否为空，否则会出现java.lang.NullPointerException异常！

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