mybaits+redis实现二级缓存

          mybaits本身有一级缓存和二级缓存，一级缓存我这里不做赘述，因为作用不是特别明显。这次我们要用的是二级缓存，二级缓存的主要是借助第三方内存/服务。我这边选择的是redis作为第三方缓存。在使用本demo之前，需要童鞋们自己本机下载一个redis服务器，具体安装可以自行百度一下。好了，废话不多说，直接上代码，我会在上代码的过程中一步一步的介绍。

第一步：配置maven包(mybaits和redis的jar包)，这个可以在maven中央库里面找到，也可以从我提供的代码中查看pom.xml

第二步：配置application.xml(添加redsi的缓存)

	

		
		
		classpath:jdbc.properties
		classpath:redis.properties
		
		
	

		  
           
           
           
           
           
          
         
         
         
         
         
         
           
         
         
         
           
           
           
           
           
         
         
         
         
         
            
       
	
	 
     
 
     
     
         
         
         
         
         
     
     
 	
        
        
            
        
        
            
        
     
    
    
    
         
     

第三步：创建RedisCacheTransfer类

/**
 * 
 */
package com.iuweb.common.util;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;

/**
 * 
  * 
  * @Description:使用第三方内存数据库Redis作为二级缓存
  * @author wangguan
  * @date 2018年5月21日 下午2:45:53
  * @versidescribeon v 1.0
 */
public class RedisCacheTransfer {
	
	 @Autowired
	    public void setconnectionFactory(JedisConnectionFactory jedisConnectionFactory) {
	        RedisCache.setJedisConnectionFactory(jedisConnectionFactory);
	    }


}

第四步：RedisCahe类

/**
 * 
 */
package com.iuweb.common.util;


import org.apache.ibatis.cache.Cache;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;

import redis.clients.jedis.exceptions.JedisConnectionException;

import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;


/**
 * 
  * 
  * @Description:创建中间类RedisCacheTransfer，完成RedisCache.jedisConnectionFactory的静态注入,静态注入中间类
  * @author wangguan
  * @date 2018年5月21日 下午2:51:17
  * @versidescribeon v 1.0
 */
public class RedisCache implements Cache
{
    //private static final Logger logger = LoggerFactory.getLogger(RedisCache.class);

    private static JedisConnectionFactory jedisConnectionFactory;

    private final String id;

    /**
     * The {@code ReadWriteLock}.
     */
    private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

    public RedisCache(final String id) {
        if (id == null) {
            throw new IllegalArgumentException("Cache instances require an ID");
        }
        System.out.println("MybatisRedisCache:id=" + id);
        //logger.debug("MybatisRedisCache:id=" + id);
        this.id = id;
    }

    @Override
    public void clear()
    {
        RedisConnection connection = null;
        try
        {
            connection = jedisConnectionFactory.getConnection();
            connection.flushDb();
            connection.flushAll();
        }
        catch (JedisConnectionException e)
        {
            e.printStackTrace();
        }
        finally
        {
            if (connection != null) {
                connection.close();
            }
        }
    }

    @Override
    public String getId()
    {
        return this.id;
    }

    @Override
    public Object getObject(Object key)
    {
        Object result = null;
        RedisConnection connection = null;
        try
        {
            connection = jedisConnectionFactory.getConnection();
            RedisSerializer