Shulou(Shulou.com)06/01 Report--

如何将SSM项目加入Redis支持？针对这个问题，今天小编总结了这篇文章，希望能帮助更多想解决这个问题的朋友找到更加简单易行的办法。

需要先搭好SSM开发环境，并安装好Redis，下面是具体的实现步骤：

1、在项目中引入jedis架包：jedis-2.8.2.jar、spring-data-redis-1.6.2.RELEASE.jar和commons-pool-1.6.jar，注意引入的jar版本，过高或过低都有可能引发异常，上面提到这些版本组合亲测可用;

2、编写Redis需要用的2个工具类 RedisUtil.java和SerializeUtil.java

3、新增一个Cache类MybatisRedisCache，实现 org.apache.ibatis.cache.Cache 接口

4、开启mybatis对缓存的支持，在本项目中，是修改 mybatis-config.xml文件

5、在相关的 mapper.xml 添加自定义的缓存类MybatisRedisCache

RedisUtil工具类是用以跟Redis数据通信，SerializeUtil为序列化工具类，也是lang包下的工具，主要用于序列化操作，同时提供对象克隆接口。下面是具体代码：

import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;public class RedisUtil { private static String ADDR = "127.0.0.1"; private static int PORT = 6379; private static int MAX_ACTIVE = 1024; private static int MAX_IDLE = 200; private static int MAX_WAIT = 100000; 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.setMaxWaitMillis(MAX_WAIT); config.setTestOnBorrow(TEST_ON_BORROW); jedisPool = new JedisPool(config,ADDR,PORT,TIMEOUT); }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); } }}import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;public class SerializeUtil { public static byte[] serialize(Object object) { ObjectOutputStream oos = null; ByteArrayOutputStream baos = null; try { // 序列化 baos = new ByteArrayOutputStream(); oos = new ObjectOutputStream(baos); oos.writeObject(object); byte[] bytes = baos.toByteArray(); return bytes; } catch (Exception e) { e.printStackTrace(); } return null; } public static Object unserialize(byte[] bytes) { if (bytes == null) return null; ByteArrayInputStream bais = null; try { // 反序列化 bais = new ByteArrayInputStream(bytes); ObjectInputStream ois = new ObjectInputStream(bais); return ois.readObject(); } catch (Exception e) { e.printStackTrace(); } return null; }}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;public class MybatisRedisCache implements Cache { private static Logger logger = LoggerFactory.getLogger(MybatisRedisCache.class); /** The ReadWriteLock. */ private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock(); private String id; public MybatisRedisCache(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); RedisUtil.getJedis().set(SerializeUtil.serialize(key.toString()), SerializeUtil.serialize(value)); } public Object getObject(Object key) { Object value = SerializeUtil.unserialize(RedisUtil.getJedis().get(SerializeUtil.serialize(key.toString()))); logger.debug(">>>>>>>>>>>>>>>>>>>>>>>>getObject:"+key+"="+value); return value; } public Object removeObject(Object key) { return RedisUtil.getJedis().expire(SerializeUtil.serialize(key.toString()),0); } public void clear() { RedisUtil.getJedis().flushDB(); } public int getSize() { return Integer.valueOf(RedisUtil.getJedis().dbSize().toString()); } public ReadWriteLock getReadWriteLock() { return readWriteLock; }}

mybatis-config.xml文件，在spring-mybatis.xml文件中选择全局加载：

以下是mybatis-config.xml详细代码：

最后在需要缓存的映射文件mapper.xml的namespace加上引用的

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.