17_10_24 Redis 实例

一，下载Redis，并打开

二，ssm中

poml.xml中：
<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-redis</artifactId>
    <version>1.6.2.RELEASE</version>
</dependency>
<!-- redis客户端jar -->
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.8.0</version>
</dependency>
<!-- 字节码操作包，用于动态生成代理类之类的操作，用于序列化和反序列化 -->
<dependency>
	<groupId>cglib</groupId>
	<artifactId>cglib</artifactId>
	<version>2.2</version>
</dependency>
<!-- aop注解 -->
<dependency>
	<groupId>org.aspectj</groupId>
	<artifactId>aspectjrt</artifactId>
<version>1.6.12</version>
</dependency>
<dependency>
	<groupId>org.aspectj</groupId>
	<artifactId>aspectjweaver</artifactId>
	<version>1.6.12</version>
</dependency>
<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-aop</artifactId>
	<version>4.3.9.RELEASE</version>
</dependency>

mybatis-spring.xml中：
<!-- 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>

	<!-- redis连接池 -->
	<bean class="redis.clients.jedis.JedisPool" destroy-method="close">
		<constructor-arg name="poolConfig" ref="poolConfig" />
		<constructor-arg name="host" value="${redis.host}" />
		<constructor-arg name="port" value="${redis.port}" />
	</bean>
	<!-- Spring-redis连接池管理工厂 -->
	<bean
		class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
		<property name="hostName" value="${redis.host}"></property>
		<property name="port" value="${redis.port}"></property>
		<property name="password" value="${redis.pass}"></property>
		<property name="poolConfig" ref="poolConfig"></property>
	</bean>

	<bean id="t" class="cm.duu.aop.T">
	</bean>
	<!-- Spring Aop 配置 get* 配置环绕 -->
	<aop:config>
		<!-- 面 -->
		<aop:aspect ref="t">
			<!-- 点 -->
			<aop:around method="doAround"
				pointcut="execution(* cm.duu.service.*.query*(..))" />
				<aop:after method="doafter" pointcut="execution(* cm.duu.service.*.add*(..))"/>
		</aop:aspect>
	</aop:config>

实体类：
package cm.duu.aop;

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

import cm.duu.util.SerializeUtil;
import redis.clients.jedis.Jedis;

public class T {
	@Autowired
	private JedisConnectionFactory jedisConnectionFactory;

	// 包名+ 类名 + 方法名 + 参数(多个) 生成Key
	public static String getRedisKey(ProceedingJoinPoint pjp) {
		StringBuilder key = new StringBuilder();
		String packageAndClassName = pjp.getTarget().getClass().getName();
		key.append(packageAndClassName);
		String methodName = pjp.getSignature().getName();
		key.append(".").append(methodName);
		Object[] args = pjp.getArgs();
		for (Object arg : args) {
			key.append(".").append(arg);
		}
		return key.toString();
	}

	public Object doAround(ProceedingJoinPoint pjp) throws Throwable {

		Jedis jedis = jedisConnectionFactory.getConnection().getNativeConnection();
		String queryKey = getRedisKey(pjp);
		byte[] queryFromRedis = jedis.get(queryKey.getBytes());
		System.out.println("我们认为应该出现map" + queryFromRedis);
		if (queryFromRedis != null) {
			System.out.println("redis里面有数据");
			return SerializeUtil.unserizlize(queryFromRedis);
		} else {
			System.out.println("redis里面没有有数据！！！！！");
			Object queryDataFromMysql = pjp.proceed();
			jedis.set(queryKey.getBytes(), SerializeUtil.serialize(queryDataFromMysql));
			return queryDataFromMysql;
		}
	}
	
	public void doafter(){
		Jedis jedis = jedisConnectionFactory.getConnection().getNativeConnection();
		jedis.flushAll();
	}

}

工具类：因为redis在存储或者获取对象的时候，必须转化序列才能转化，如：Map<String,List<Student>>这样比较复杂的情况的存储
package cm.duu.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class SerializeUtil {

	// 序列化
	public static byte[] serialize(Object obj) throws IOException {
		ByteArrayOutputStream bai = new ByteArrayOutputStream();
		ObjectOutputStream obi = new ObjectOutputStream(bai);
		obi.writeObject(obj);
		byte[] byt = bai.toByteArray();
		return byt;
	}

	// 反序列化
	public static Object unserizlize(byte[] byt) throws IOException, ClassNotFoundException {
		ByteArrayInputStream bis = new ByteArrayInputStream(byt);
		ObjectInputStream oii = new ObjectInputStream(bis);
		Object obj = oii.readObject();
		return obj;
	}

}

Jedis流程

如下：