一?添加緩存相關(guān)依賴

<!-- redis --> <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId> </dependency><!-- spring2.X集成redis所需common-pool2--> <dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId><version>2.6.0</version> </dependency>

二?加上緩存的配置類

package com.baiyee.sdgt.common.config;import com.fasterxml.jackson.annotation.JsonAutoDetect; import com.fasterxml.jackson.annotation.PropertyAccessor; import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.cache.CacheManager; import org.springframework.cache.annotation.EnableCaching; import org.springframework.cache.interceptor.KeyGenerator; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.cache.RedisCacheConfiguration; import org.springframework.data.redis.cache.RedisCacheManager; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.RedisSerializationContext; import org.springframework.data.redis.serializer.RedisSerializer; import org.springframework.data.redis.serializer.StringRedisSerializer;import java.lang.reflect.Method; import java.time.Duration;@Configuration @EnableCaching public class RedisConfig {/*** 自定義key規(guī)則** @return*/@Beanpublic KeyGenerator keyGenerator() {return new KeyGenerator() {@Overridepublic Object generate(Object target, Method method, Object... params) {StringBuilder sb = new StringBuilder();sb.append(target.getClass().getName());sb.append(method.getName());for (Object obj : params) {sb.append(obj.toString());}return sb.toString();}};}/*** 設(shè)置RedisTemplate規(guī)則** @param redisConnectionFactory* @return*/@Beanpublic RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();redisTemplate.setConnectionFactory(redisConnectionFactory);Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);// 解決查詢緩存轉(zhuǎn)換異常的問題ObjectMapper om = new ObjectMapper();// 指定要序列化的域，field,get和set,以及修飾符范圍，ANY是都有包括private和publicom.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);// 指定序列化輸入的類型，類必須是非final修飾的，final修飾的類，比如String,Integer等會(huì)跑出異常om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);jackson2JsonRedisSerializer.setObjectMapper(om);// 序列號(hào)key valueredisTemplate.setKeySerializer(new StringRedisSerializer());redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);redisTemplate.setHashKeySerializer(new StringRedisSerializer());redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);redisTemplate.afterPropertiesSet();return redisTemplate;}/*** 設(shè)置 CacheManager 緩存規(guī)則** @param factory* @return*/@Beanpublic CacheManager cacheManager(RedisConnectionFactory factory) {RedisSerializer<String> redisSerializer = new StringRedisSerializer();Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);// 解決查詢緩存轉(zhuǎn)換異常的問題ObjectMapper om = new ObjectMapper();om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);jackson2JsonRedisSerializer.setObjectMapper(om);// 配置序列化（解決亂碼的問題）,過期時(shí)間600秒RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig().entryTtl(Duration.ofSeconds(600)).serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer)).serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer)).disableCachingNullValues();RedisCacheManager cacheManager = RedisCacheManager.builder(factory).cacheDefaults(config).build();return cacheManager;} }

三?給具體服務(wù)加 redis?配置

spring.redis.host=127.0.0.1 spring.redis.port=6379 spring.redis.database=8 spring.redis.timeout=1800000spring.redis.lettuce.pool.max-active=20 spring.redis.lettuce.pool.max-wait=-1 # 最大阻塞等待時(shí)間(負(fù)數(shù)表示沒限制) spring.redis.lettuce.pool.max-idle=5 spring.redis.lettuce.pool.min-idle=0

四?加注解使得緩存生效

1?使用原則

• @Cacheable：一般用在查詢方法上。根據(jù)方法對(duì)其返回結(jié)果進(jìn)行緩存，下次請(qǐng)求時(shí)，如果緩存存在，則直接讀取緩存數(shù)據(jù)返回；如果緩存不存在，則執(zhí)行方法，并把返回的結(jié)果存入緩存中。
• @CachePut：一般用在新增方法上。使用該注解標(biāo)志的方法，每次都會(huì)執(zhí)行，并將結(jié)果存入指定的緩存中。其他方法可以直接從響應(yīng)的緩存中讀取緩存數(shù)據(jù)，而不需要再去查詢數(shù)據(jù)庫(kù)。
• @CacheEvict：一般用在更新或者刪除方法上。使用該注解標(biāo)志的方法，會(huì)清空指定的緩存。

2?給相關(guān)代碼加緩存

// 導(dǎo)入數(shù)據(jù)字典 @Override @CacheEvict(value = "dict", allEntries = true) public void importDictData(MultipartFile file) {try {EasyExcel.read(file.getInputStream(), DictEeVo.class, new DictListener(baseMapper)).sheet().doRead();} catch (IOException e) {e.printStackTrace();} }// 根據(jù)數(shù)據(jù) id 查詢子數(shù)據(jù)列表 @Override @Cacheable(value = "dict",keyGenerator = "keyGenerator") public List<Dict> findChlidData(Long id) {QueryWrapper<Dict> wrapper = new QueryWrapper<>();wrapper.eq("parent_id", id);List<Dict> dictList = baseMapper.selectList(wrapper);// 向 list 集合每個(gè) dict 對(duì)象中設(shè)置 hasChildrenfor (Dict dict : dictList) {Long dictId = dict.getId();boolean isChild = this.isChildren(dictId);dict.setHasChildren(isChild);}return dictList; }

五?測(cè)試效果

1?瀏覽數(shù)據(jù)字典

2?生成緩存數(shù)據(jù)

?

總結(jié)

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