redis与ssm整合视频 ssm使用redis

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cnolnic 2023-05-30 13:42:31

文章标签 redis与ssm整合视频 redis spring Redis 文章分类 Redis 数据库

本文主要讲解如何在现有的SSM（Spring + SpringMVC + Mybatis）项目下，整合Redis作为二级缓存，本文使用的是mysql数据库。

准备工作：

·完整的SSM项目；

SSM项目搭建及源码

·已安装好的Redis支持

整合过程：

1、在原来的项目中添加相关的jar包支持

redis与ssm整合视频 ssm使用redis_redis

注意：这里用的是spring-data-redis-1.4.1.RELEASE.jar，这个版本下，Redis版本必须在2.6.2以下，commons-pool2必须在2.0以上，否则会有兼容性问题

2、编写工具类（实现cache接口）

RedisCache.java

package com.redis;

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 org.springframework.data.redis.connection.jedis.JedisConnection;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;

import com.sun.jndi.url.corbaname.corbanameURLContextFactory;
import com.sun.org.apache.xml.internal.serialize.Serializer;

import redis.clients.jedis.exceptions.JedisConnectionException;

/**
 * 
 *  使用第三方内存数据库Redis作为二级缓存
 */
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");
        }
        logger.debug("MybatisRedisCache:id=" + id);
        this.id = id;
    }

    @Override
    public void clear() {
        JedisConnection 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;
        JedisConnection connection = null;
        key = com.util.StringUtil.redisKey(key);
        try {
            connection = jedisConnectionFactory.getConnection();
            RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer();
            result = serializer.deserialize(connection.get(serializer.serialize(key)));
        } catch (JedisConnectionException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.close();
            }
        }
        return result;
    }

    @Override
    public ReadWriteLock getReadWriteLock() {
        // TODO Auto-generated method stub
        return this.readWriteLock;
    }

    @Override
    public int getSize() {
        int result = 0;
        JedisConnection connection = null;
        try {
            connection = jedisConnectionFactory.getConnection();
            result = Integer.valueOf(connection.dbSize().toString());
        } catch (JedisConnectionException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.close();
            }
        }
        return result;
    }

    @Override
    public void putObject(Object key, Object value) {
        JedisConnection connection = null;
        key = com.util.StringUtil.redisKey(key);
        try {
            connection = jedisConnectionFactory.getConnection();
            RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer();
            connection.set(serializer.serialize(key), serializer.serialize(value));
        } catch (JedisConnectionException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.close();
            }
        }
    }

    @Override
    public Object removeObject(Object key) {
        JedisConnection connection = null;
        Object result = null;
        try {
            connection = jedisConnectionFactory.getConnection();
            RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer();
            result = connection.expire(serializer.serialize(key), 0);
        } catch (JedisConnectionException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.close();
            }
        }
        return result;
    }

    public static void updataObject(String key,Object value){
    	JedisConnection connection = null;
        try {
            connection = jedisConnectionFactory.getConnection();
            RedisSerializer<Object> serializer = new JdkSerializationRedisSerializer();          
            connection.expire(serializer.serialize(key), 0);
            if(key.indexOf("UserMapper")>0){
            	connection.expire(serializer.serialize("UserMapper"), 0);
            }
            else if(key.indexOf("ArticleMapper")>0){
            	connection.expire(serializer.serialize("ArticleMapper"), 0);
            }
            else if(key.indexOf("CommentMapper")>0){
            	connection.expire(serializer.serialize("CommentMapper"), 0);
            }
            else if(key.indexOf("MessageMapper")>0){
            	connection.expire(serializer.serialize("MessageMapper"), 0);
            }
            
        } catch (JedisConnectionException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.close();
            }
        }
    }
    
    public static void setJedisConnectionFactory(JedisConnectionFactory jedisConnectionFactory) {
        RedisCache.jedisConnectionFactory = jedisConnectionFactory;
    }
}

RedisCacheTransfer.java

package com.redis;

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


public class RedisCacheTransfer{

	 @Autowired
	    public void setJedisConnectionFactory(JedisConnectionFactory jedisConnectionFactory) {
	        RedisCache.setJedisConnectionFactory(jedisConnectionFactory);
	        
	    }
}

3、开启mybatis中对缓存的支持

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 -->
		<property name="mapperLocations" value="classpath:com/mapping/*.xml" />
                <!-- 以下为添加支持部分star -->
		<!-- 开启缓存支持 -->
         <property name="configurationProperties">
            <props>
                <!-- 开启关键-->
                <prop key="cacheEnabled">true</prop>
                <!-- 查询时，关闭关联对象即时加载以提高性能 -->
                <prop key="lazyLoadingEnabled">false</prop>
                <!-- 设置关联对象加载的形态，此处为按需加载字段(加载字段由SQL指定)，不会加载关联表的所有字段，以提高性能 -->
                <prop key="aggressiveLazyLoading">true</prop>
                <!-- 对于未知的SQL查询，允许返回不同的结果集以达到通用的效果 -->
                <prop key="multipleResultSetsEnabled">true</prop>
                <!-- 允许使用列标签代替列名 -->
                <prop key="useColumnLabel">true</prop>
                <!-- 允许使用自定义的主键值(比如由程序生成的UUID 32位编码作为键值)，数据表的PK生成策略将被覆盖 -->
                <prop key="useGeneratedKeys">true</prop>
                <!-- 给予被嵌套的resultMap以字段-属性的映射支持 -->
                <prop key="autoMappingBehavior">FULL</prop>
                <!-- 对于批量更新操作缓存SQL以提高性能 -->
                <prop key="defaultExecutorType">BATCH</prop>
                <!-- 数据库超过25000秒仍未响应则超时 -->
                <prop key="defaultStatementTimeout">25000</prop>
            </props>
        </property>
        <!-- end -->
	</bean>

4、redis属性文件redis.properties

# Redis settings  
redis.host=127.0.0.1
redis.port=6379  
redis.pass=

redis.maxIdle=300  
redis.maxActive=600  
redis.maxWait=1000  
redis.testOnBorrow=true

5、Redis数据管理

<bean
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:config.properties</value>
                               <!-- 扫描redis属性文件 -->
                                <value>classpath:redis.properties</value>
			</list>
		</property>
	</bean>
	
	 <!-- redis数据源 -->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}" />
        <property name="maxTotal" value="${redis.maxActive}" />
        <property name="maxWaitMillis" value="${redis.maxWait}" />
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />
    </bean>
    <!-- Spring-redis连接池管理工厂 -->
    <bean id="jedisConnectionFactory"
        class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
        p:host-name="${redis.host}" p:port="${redis.port}" p:password="${redis.pass}" 
        p:pool-config-ref="poolConfig" />
    <!-- 使用中间类解决RedisCache.jedisConnectionFactory的静态注入，从而使MyBatis实现第三方缓存 -->
    <bean id="redisCacheTransfer" class="com.redis.RedisCacheTransfer">
        <property name="jedisConnectionFactory" ref="jedisConnectionFactory" />
    </bean>

6、相关的mapper.xml文件添加缓存工具类