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！