1、實現(xiàn)目標

通過redis緩存數(shù)據(jù)。（目的不是加快查詢的速度，而是減少數(shù)據(jù)庫的負擔(dān)）

2、所需jar包

注意：jdies和commons-pool兩個jar的版本是有對應(yīng)關(guān)系的，注意引入jar包是要配對使用，否則將會報錯。因為commons-pooljar的目錄根據(jù)版本的變化，目錄結(jié)構(gòu)會變。前面的版本是org.apache.pool，而后面的版本是org.apache.pool2…

style=”background-color: #0098dd; color: white; font-size: 17px; font-weight: bold;”3、redis簡介

redis是一個key-value存儲系統(tǒng)。和Memcached類似，它支持存儲的value類型相對更多，包括string(字符串)、list(鏈表)、set(集合)、zset(sorted set –有序集合)和hash（哈希類型）。這些數(shù)據(jù)類型都支持push/pop、add/remove及取交集并集和差集及更豐富的操作，而且這些操作都是原子性的。在此基礎(chǔ)上，redis支持各種不同方式的排序。與memcached一樣，為了保證效率，數(shù)據(jù)都是緩存在內(nèi)存中。區(qū)別的是redis會周期性的把更新的數(shù)據(jù)寫入磁盤或者把修改操作寫入追加的記錄文件，并且在此基礎(chǔ)上實現(xiàn)了master-slave(主從)

4、編碼實現(xiàn)

1）、配置的文件（properties）

將那些經(jīng)常要變化的參數(shù)配置成獨立的propertis，方便以后的修改

redis.properties

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redis.hostName=127.0.0.1 redis.port=6379 redis.timeout=15000 redis.usePool=true redis.maxIdle=6 redis.minEvictableIdleTimeMillis=300000 redis.numTestsPerEvictionRun=3 redis.timeBetweenEvictionRunsMillis=60000

2)、spring-redis.xml

redis的相關(guān)參數(shù)配置設(shè)置。參數(shù)的值來自上面的properties文件

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<beansxmlns="http://www.springframework.org/schema/beans"?? xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"? xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd" default-autowire="byName">? ????<beanid="jedisPoolConfig"class="redis.clients.jedis.JedisPoolConfig">? ????????<!-- <property name="maxIdle" value="6"></property>? ????????<property name="minEvictableIdleTimeMillis" value="300000"></property>? ????????<property name="numTestsPerEvictionRun" value="3"></property>? ????????<property name="timeBetweenEvictionRunsMillis" value="60000"></property>?? --> ????????<propertyname="maxIdle"value="${redis.maxIdle}"></property>? ????????<propertyname="minEvictableIdleTimeMillis"value="${redis.minEvictableIdleTimeMillis}"></property>? ????????<propertyname="numTestsPerEvictionRun"value="${redis.numTestsPerEvictionRun}"></property>? ????????<propertyname="timeBetweenEvictionRunsMillis"value="${redis.timeBetweenEvictionRunsMillis}"></property> ????</bean>? ????<beanid="jedisConnectionFactory"class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"destroy-method="destroy">? ????????<propertyname="poolConfig"ref="jedisPoolConfig"></property>? ????????<propertyname="hostName"value="${redis.hostName}"></property>? ????????<propertyname="port"value="${redis.port}"></property>? ????????<propertyname="timeout"value="${redis.timeout}"></property>? ????????<propertyname="usePool"value="${redis.usePool}"></property>? ????</bean>? ????<beanid="jedisTemplate"class="org.springframework.data.redis.core.RedisTemplate">? ????????<propertyname="connectionFactory"ref="jedisConnectionFactory"></property>? ????????<propertyname="keySerializer">? ????????????<beanclass="org.springframework.data.redis.serializer.StringRedisSerializer"/>? ????????</property>? ????????<propertyname="valueSerializer">? ????????????<beanclass="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/>? ????????</property>? ????</bean>? </beans>

3）、applicationContext.xml

spring的總配置文件，在里面假如一下的代碼

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<beanclass="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> ????????<propertyname="systemPropertiesModeName"value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/> ????????<propertyname="ignoreResourceNotFound"value="true"/> ????????<propertyname="locations"> ????????????<list> ????????????????<value>classpath*:/META-INF/config/redis.properties</value> ????????????</list> ????????</property> ????</bean> <importresource="spring-redis.xml"/>

4）、web。xml

設(shè)置spring的總配置文件在項目啟動時加載

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<context-param> ????<param-name>contextConfigLocation</param-name> ????<param-value>classpath*:/META-INF/applicationContext.xml</param-value><!--? --> </context-param>

5）、redis緩存工具類

ValueOperations　　——基本數(shù)據(jù)類型和實體類的緩存
ListOperations　　 ? ——list的緩存
SetOperations　　 ?——set的緩存

HashOperations　　Map的緩存

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importjava.io.Serializable; importjava.util.ArrayList; importjava.util.HashMap; importjava.util.HashSet; importjava.util.Iterator; importjava.util.List; importjava.util.Map; importjava.util.Set; importorg.springframework.beans.factory.annotation.Autowired; importorg.springframework.beans.factory.annotation.Qualifier; importorg.springframework.context.support.ClassPathXmlApplicationContext; importorg.springframework.data.redis.core.BoundSetOperations; importorg.springframework.data.redis.core.HashOperations; importorg.springframework.data.redis.core.ListOperations; importorg.springframework.data.redis.core.RedisTemplate; importorg.springframework.data.redis.core.SetOperations; importorg.springframework.data.redis.core.ValueOperations; importorg.springframework.stereotype.Service; @Service publicclass RedisCacheUtil<T> { ????@Autowired@Qualifier("jedisTemplate") ????publicRedisTemplate redisTemplate; ????/** ?????* 緩存基本的對象，Integer、String、實體類等 ?????* @param key??? 緩存的鍵值 ?????* @param value??? 緩存的值 ?????* @return??????? 緩存的對象 ?????*/ ????public<T> ValueOperations<String,T> setCacheObject(String key,T value) ????{ ????????ValueOperations<String,T> operation = redisTemplate.opsForValue(); ????????operation.set(key,value); ????????returnoperation; ????} ????/** ?????* 獲得緩存的基本對象。 ?????* @param key??????? 緩存鍵值 ?????* @param operation ?????* @return??????????? 緩存鍵值對應(yīng)的數(shù)據(jù) ?????*/ ????public<T> T getCacheObject(String key/*,ValueOperations<String,T> operation*/) ????{ ????????ValueOperations<String,T> operation = redisTemplate.opsForValue(); ????????return operation.get(key); ????} ????/** ?????* 緩存List數(shù)據(jù) ?????* @param key??????? 緩存的鍵值 ?????* @param dataList??? 待緩存的List數(shù)據(jù) ?????* @return??????????? 緩存的對象 ?????*/ ????public <T> ListOperations<String, T> setCacheList(String key,List<T> dataList) ????{ ????????ListOperations listOperation = redisTemplate.opsForList(); ????????if(null != dataList) ????????{ ????????????int size = dataList.size(); ????????????for(int i = 0; i < size ; i ++) ????????????{ ????????????????listOperation.rightPush(key,dataList.get(i)); ????????????} ????????} ????????return listOperation; ????} ????/** ?????* 獲得緩存的list對象 ?????* @param key??? 緩存的鍵值 ?????* @return??????? 緩存鍵值對應(yīng)的數(shù)據(jù) ?????*/ ????public <T> List<T> getCacheList(String key) ????{ ????????List<T> dataList = new ArrayList<T>(); ????????ListOperations<String,T> listOperation = redisTemplate.opsForList(); ????????Long size = listOperation.size(key); ????????for(int i = 0 ; i < size ; i ++) ????????{ ????????????dataList.add((T) listOperation.leftPop(key)); ????????} ????????return dataList; ????} ????/** ?????* 緩存Set ?????* @param key??????? 緩存鍵值 ?????* @param dataSet??? 緩存的數(shù)據(jù) ?????* @return??????????? 緩存數(shù)據(jù)的對象 ?????*/ ????public <T> BoundSetOperations<String,T> setCacheSet(String key,Set<T> dataSet) ????{ ????????BoundSetOperations<String,T> setOperation = redisTemplate.boundSetOps(key);??? ????????/*T[] t = (T[]) dataSet.toArray(); ?????????????setOperation.add(t);*/ ????????Iterator<T> it = dataSet.iterator(); ????????while(it.hasNext()) ????????{ ????????????setOperation.add(it.next()); ????????} ????????return setOperation; ????} ????/** ?????* 獲得緩存的set ?????* @param key ?????* @param operation ?????* @return ?????*/ ????public Set<T> getCacheSet(String key/*,BoundSetOperations<String,T> operation*/) ????{ ????????Set<T> dataSet = new HashSet<T>(); ????????BoundSetOperations<String,T> operation = redisTemplate.boundSetOps(key);??? ????????Long size = operation.size(); ????????for(int i = 0 ; i < size ; i++) ????????{ ????????????dataSet.add(operation.pop()); ????????} ????????return dataSet; ????} ????/** ?????* 緩存Map ?????* @param key ?????* @param dataMap ?????* @return ?????*/ ????public <T> HashOperations<String,String,T> setCacheMap(String key,Map<String,T> dataMap) ????{ ????????HashOperations hashOperations = redisTemplate.opsForHash(); ????????if(null != dataMap) ????????{ ????????????for (Map.Entry<String, T> entry : dataMap.entrySet()) {? ????????????????/*System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());? */ ????????????????hashOperations.put(key,entry.getKey(),entry.getValue()); ????????????} ????????} ????????return hashOperations; ????} ????/** ?????* 獲得緩存的Map ?????* @param key ?????* @param hashOperation ?????* @return ?????*/ ????public <T> Map<String,T> getCacheMap(String key/*,HashOperations<String,String,T> hashOperation*/) ????{ ????????Map<String, T> map = redisTemplate.opsForHash().entries(key); ????????/*Map<String, T> map = hashOperation.entries(key);*/ ????????return map; ????} ????/** ?????* 緩存Map ?????* @param key ?????* @param dataMap ?????* @return ?????*/ ????public <T> HashOperations<String,Integer,T> setCacheIntegerMap(String key,Map<Integer,T> dataMap) ????{ ????????HashOperations hashOperations = redisTemplate.opsForHash(); ????????if(null != dataMap) ????????{ ????????????for (Map.Entry<Integer, T> entry : dataMap.entrySet()) {? ????????????????/*System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());? */ ????????????????hashOperations.put(key,entry.getKey(),entry.getValue()); ????????????} ????????} ????????return hashOperations; ????} ????/** ?????* 獲得緩存的Map ?????* @param key ?????* @param hashOperation ?????* @return ?????*/ ????public <T> Map<Integer,T> getCacheIntegerMap(String key/*,HashOperations<String,String,T> hashOperation*/) ????{ ????????Map<Integer, T> map = redisTemplate.opsForHash().entries(key); ????????/*Map<String, T> map = hashOperation.entries(key);*/ ????????returnmap; ????} }

6）、測試

這里測試我是在項目啟動的時候到數(shù)據(jù)庫中查找出國家和城市的數(shù)據(jù)，進行緩存，之后將數(shù)據(jù)去出

6.1 ?項目啟動時緩存數(shù)據(jù)

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importjava.util.HashMap; importjava.util.List; importjava.util.Map; importorg.apache.log4j.Logger; importorg.springframework.beans.factory.annotation.Autowired; importorg.springframework.context.ApplicationListener; importorg.springframework.context.event.ContextRefreshedEvent; importorg.springframework.stereotype.Service; importcom.test.model.City; importcom.test.model.Country; importcom.zcr.test.User; /* ?* 監(jiān)聽器，用于項目啟動的時候初始化信息 ?*/ @Service publicclass StartAddCacheListener implementsApplicationListener<ContextRefreshedEvent> { ????//日志 ????privatefinal Logger log= Logger.getLogger(StartAddCacheListener.class); ????@Autowired ????privateRedisCacheUtil<Object> redisCache; ????@Autowired ????privateBrandStoreService brandStoreService; ????@Override ????publicvoid onApplicationEvent(ContextRefreshedEvent? event) ????{ ????????//spring 啟動的時候緩存城市和國家等信息 ????????if(event.getApplicationContext().getDisplayName().equals("Root WebApplicationContext")) ????????{ ????????????System.out.println("\n\n\n_________\n\n緩存數(shù)據(jù) \n\n ________\n\n\n\n"); ????????????List<City> cityList = brandStoreService.selectAllCityMessage(); ????????????List<Country> countryList = brandStoreService.selectAllCountryMessage(); ????????????Map<Integer,City> cityMap = newHashMap<Integer,City>(); ????????????Map<Integer,Country> countryMap = newHashMap<Integer, Country>(); ????????????intcityListSize = cityList.size(); ????????????intcountryListSize = countryList.size(); ????????????for(inti = 0; i < cityListSize ; i ++ ) ????????????{ ????????????????cityMap.put(cityList.get(i).getCity_id(), cityList.get(i)); ????????????} ????????????for(inti = 0; i < countryListSize ; i ++ ) ????????????{ ????????????????countryMap.put(countryList.get(i).getCountry_id(), countryList.get(i)); ????????????} ????????????redisCache.setCacheIntegerMap("cityMap", cityMap); ????????????redisCache.setCacheIntegerMap("countryMap", countryMap); ????????} ????} }

6.2 ?獲取緩存數(shù)據(jù)

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@Autowired ????privateRedisCacheUtil<User> redisCache; ????@RequestMapping("testGetCache") ????publicvoid testGetCache() ????{ ????????/*Map<String,Country> countryMap = redisCacheUtil1.getCacheMap("country"); ????????Map<String,City> cityMap = redisCacheUtil.getCacheMap("city");*/ ????????Map<Integer,Country> countryMap = redisCacheUtil1.getCacheIntegerMap("countryMap"); ????????Map<Integer,City> cityMap = redisCacheUtil.getCacheIntegerMap("cityMap"); ????????for(intkey : countryMap.keySet()) ????????{ ????????????System.out.println("key = " + key + ",value="+ countryMap.get(key)); ????????} ????????System.out.println("------------city"); ????????for(intkey : cityMap.keySet()) ????????{ ????????????System.out.println("key = " + key + ",value="+ cityMap.get(key)); ????????} ????}

由于Spring在配置文件中配置的bean默認是單例的，所以只需要通過Autowired注入，即可得到原先的緩存類。

原文出處：?WhyWin

from:?http://www.importnew.com/22868.html

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