
Redis安裝與使用
第一步當然是安裝Redis,這里以Windows上的安裝為例。
- 首先下載Redis,可以選擇msi或zip包安裝方式
- zip方式需打開cmd窗口,在解壓后的目錄下運行
redis-server redis.windows.conf啟動Redis - 采用msi方式安裝后Redis默認啟動,不需要進行任何配置
- 可以在redis.windows.conf文件中修改Redis端口號、密碼等配置,修改完成后使用
redis-server redis.windows.conf命令重新啟動 - 在Redis安裝目錄下執(zhí)行
redis-cli -h 127.0.0.1 -p 6379 -a 密碼打開Redis操作界面 - 如果報錯
(error) ERR operation not permitted,使用auth 密碼進行驗證
SSM整合Redis
這里直接在上一篇SSM之框架整合的基礎(chǔ)上進行Redis整合,這里需要注意,存入Redis的pojo類必須實現(xiàn)Serializable接口。
配置pom.xml引入Redis依賴
<!--redis-->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.6.1.RELEASE</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.7.3</version>
</dependency>
redis.properties
redis.host=127.0.0.1
redis.port=6379
redis.password=redis
redis.maxIdle=100
redis.maxWait=1000
redis.testOnBorrow=true
redis.timeout=100000
defaultCacheExpireTime=3600
applicationContext-redis.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--引入Redis配置文件-->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:redis.properties</value>
</list>
</property>
</bean>
<!-- jedis 連接池配置 -->
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="${redis.maxIdle}"/>
<property name="maxWaitMillis" value="${redis.maxWait}"/>
<property name="testOnBorrow" value="${redis.testOnBorrow}"/>
</bean>
<!-- redis連接工廠 -->
<bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
<property name="poolConfig" ref="poolConfig"/>
<property name="port" value="${redis.port}"/>
<property name="hostName" value="${redis.host}"/>
<property name="password" value="${redis.password}"/>
<property name="timeout" value="${redis.timeout}"></property>
</bean>
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
<property name="connectionFactory" ref="connectionFactory"/>
<property name="keySerializer">
<bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/>
</property>
<property name="valueSerializer">
<bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/>
</property>
</bean>
<!-- 緩存攔截器配置 -->
<bean id="methodCacheInterceptor" class="com.zkh.interceptor.MethodCacheInterceptor">
<property name="redisUtil" ref="redisUtil"/>
<property name="defaultCacheExpireTime" value="${defaultCacheExpireTime}"/>
<!-- 禁用緩存的類名列表 -->
<property name="targetNamesList">
<list>
<value></value>
</list>
</property>
<!-- 禁用緩存的方法名列表 -->
<property name="methodNamesList">
<list>
<value></value>
</list>
</property>
</bean>
<bean id="redisUtil" class="com.zkh.util.RedisUtil">
<property name="redisTemplate" ref="redisTemplate"/>
</bean>
<!--配置切面攔截方法 -->
<aop:config proxy-target-class="true">
<aop:pointcut id="controllerMethodPointcut" expression="
execution(* com.zkh.service.impl.*.select*(..))"/>
<aop:advisor advice-ref="methodCacheInterceptor" pointcut-ref="controllerMethodPointcut"/>
</aop:config>
</beans>
MethodCacheInterceptor.java
package com.zkh.interceptor;
import com.zkh.util.RedisUtil;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import java.util.List;
/**
* Redis緩存過濾器
*/
public class MethodCacheInterceptor implements MethodInterceptor {
private RedisUtil redisUtil;
private List<String> targetNamesList; // 禁用緩存的類名列表
private List<String> methodNamesList; // 禁用緩存的方法列表
private String defaultCacheExpireTime; // 緩存默認的過期時間
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
Object value = null;
String targetName = invocation.getThis().getClass().getName();
String methodName = invocation.getMethod().getName();
if (!isAddCache(targetName, methodName)) {
// 跳過緩存返回結(jié)果
return invocation.proceed();
}
Object[] arguments = invocation.getArguments();
String key = getCacheKey(targetName, methodName, arguments);
try {
// 判斷是否有緩存
if (redisUtil.exists(key)) {
return redisUtil.get(key);
}
// 寫入緩存
value = invocation.proceed();
if (value != null) {
final String tkey = key;
final Object tvalue = value;
new Thread(new Runnable() {
@Override
public void run() {
redisUtil.set(tkey, tvalue, Long.parseLong(defaultCacheExpireTime));
}
}).start();
}
} catch (Exception e) {
e.printStackTrace();
if (value == null) {
return invocation.proceed();
}
}
return value;
}
/**
* 是否加入緩存
*
* @return
*/
private boolean isAddCache(String targetName, String methodName) {
boolean flag = true;
if (targetNamesList.contains(targetName)
|| methodNamesList.contains(methodName) || targetName.contains("$$EnhancerBySpringCGLIB$$")) {
flag = false;
}
return flag;
}
/**
* 創(chuàng)建緩存key
*
* @param targetName
* @param methodName
* @param arguments
*/
private String getCacheKey(String targetName, String methodName,
Object[] arguments) {
StringBuffer sbu = new StringBuffer();
sbu.append(targetName).append("_").append(methodName);
if ((arguments != null) && (arguments.length != 0)) {
for (int i = 0; i < arguments.length; i++) {
sbu.append("_").append(arguments[i]);
}
}
return sbu.toString();
}
public void setRedisUtil(RedisUtil redisUtil) {
this.redisUtil = redisUtil;
}
public void setTargetNamesList(List<String> targetNamesList) {
this.targetNamesList = targetNamesList;
}
public void setMethodNamesList(List<String> methodNamesList) {
this.methodNamesList = methodNamesList;
}
public void setDefaultCacheExpireTime(String defaultCacheExpireTime) {
this.defaultCacheExpireTime = defaultCacheExpireTime;
}
}
RedisUtil.java 工具類
package com.zkh.util;
import org.apache.log4j.Logger;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import java.io.Serializable;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* Redis工具類
*/
public class RedisUtil {
private RedisTemplate<Serializable, Object> redisTemplate;
/**
* 批量刪除對應(yīng)的value
*
* @param keys
*/
public void remove(final String... keys) {
for (String key : keys) {
remove(key);
}
}
/**
* 批量刪除key
*
* @param pattern
*/
public void removePattern(final String pattern) {
Set<Serializable> keys = redisTemplate.keys(pattern);
if (keys.size() > 0)
redisTemplate.delete(keys);
}
/**
* 刪除對應(yīng)的value
*
* @param key
*/
public void remove(final String key) {
if (exists(key)) {
redisTemplate.delete(key);
}
}
/**
* 判斷緩存中是否有對應(yīng)的value
*
* @param key
* @return
*/
public boolean exists(final String key) {
return redisTemplate.hasKey(key);
}
/**
* 讀取緩存
*
* @param key
* @return
*/
public Object get(final String key) {
Object result = null;
ValueOperations<Serializable, Object> operations = redisTemplate
.opsForValue();
result = operations.get(key);
return result;
}
/**
* 寫入緩存
*
* @param key
* @param value
* @return
*/
public boolean set(final String key, Object value) {
boolean result = false;
try {
ValueOperations<Serializable, Object> operations = redisTemplate
.opsForValue();
operations.set(key, value);
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 寫入緩存
*
* @param key
* @param value
* @return
*/
public boolean set(final String key, Object value, Long expireTime) {
boolean result = false;
try {
ValueOperations<Serializable, Object> operations = redisTemplate
.opsForValue();
operations.set(key, value);
redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
public void setRedisTemplate(
RedisTemplate<Serializable, Object> redisTemplate) {
this.redisTemplate = redisTemplate;
}
}
效果展示

剛開始Redis中沒有任何記錄,接下來訪問一下第一頁記錄

再查看緩存,記錄已經(jīng)存如Redis,并且第一次訪問會從Mysql中讀取數(shù)據(jù)


按F5刷新頁面,從Tomcat控制臺可以看到?jīng)]有進行SQL查詢,而是直接從Redis中讀取緩存數(shù)據(jù),減輕了數(shù)據(jù)庫的負擔(dān)


具體代碼已發(fā)布在Github上,地址:SSM
本文為作者kMacro原創(chuàng),轉(zhuǎn)載請注明來源:http://www.itdecent.cn/p/7fecfad2970c。