介绍SpringBoot 整合 Redis 缓存

<dependency>????
????<groupId>org.springframework.boot</groupId>????
????<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
????<groupId>com.alibaba</groupId>
????<artifactId>fastjson</artifactId>
????<version>1.2.62</version>
</dependency>

#?Redis数据库索引（默认为0）??
spring.redis.database=0??
#?Redis服务器地址??
spring.redis.host=localhost
#?Redis服务器连接端口??
spring.redis.port=6379??
#?Redis服务器连接密码（默认为空）??
spring.redis.password=123456
#?连接池最大连接数（使用负值表示没有限制）??
spring.redis.pool.max-active=200??
#?连接池最大阻塞等待时间（使用负值表示没有限制）??
spring.redis.pool.max-wait=-1??
#?连接池中的最大空闲连接??
spring.redis.pool.max-idle=10?
#?连接池中的最小空闲连接??
spring.redis.pool.min-idle=0??
#?连接超时时间（毫秒）??
spring.redis.timeout=1000ms

@Configuration
@ConditionalOnClass(RedisOperations.class)??????//系统中有RedisOperations类时
@EnableConfigurationProperties(RedisProperties.class)??//启动RedisProperties这个类
@EnableCaching

//?www.1b23.com
public?class?RedisConfig?extends?CachingConfigurerSupport?{
????@Autowired
????RedisTemplate?redisTemplate;
????//?配置缓存管理器
????@Bean
????public?RedisCacheManager?cacheManager(RedisConnectionFactory?connectionFactory)?{
????????LettuceConnectionFactory?jedisConnectionFactory?=?(LettuceConnectionFactory)?redisTemplate.getConnectionFactory();
????????jedisConnectionFactory.setDatabase(2);??????//指定dbindex
????????redisTemplate.setConnectionFactory(jedisConnectionFactory);
????????jedisConnectionFactory.resetConnection();

????????RedisCacheConfiguration?config?=?RedisCacheConfiguration.defaultCacheConfig()
????????????????.entryTtl(Duration.ofSeconds(60*20))?//?20分钟缓存失效
????????????????//?设置key的序列化方式
//????????????????.entryTtl(Duration.ofSeconds(10))
????????????????.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new?StringRedisSerializer()))
????????????????//?设置value的序列化方式
????????????????.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new?FastJsonRedisSerializer(Object.class)))
????????????????//?不缓存null值
????????????????.disableCachingNullValues();
????????RedisCacheManager?redisCacheManager?=?RedisCacheManager.builder(connectionFactory)
????????????????.cacheDefaults(config)
????????????????.transactionAware()
????????????????.build();
????????return?redisCacheManager;
????}
}

package?com.FireService.config;
import?java.nio.charset.Charset;
import?org.springframework.data.redis.serializer.RedisSerializer;
import?org.springframework.data.redis.serializer.SerializationException;
import?com.alibaba.fastjson.JSON;
import?com.alibaba.fastjson.parser.ParserConfig;
import?com.alibaba.fastjson.serializer.SerializerFeature;

public?class?FastJsonRedisSerializer<T>?implements?RedisSerializer<T>?{

????public?static?final?Charset?DEFAULT_charset=utf-8.forName("UTF-8");

????private?Class<T>?clazz;
????static?{
????????ParserConfig.getGlobalInstance().addAccept("com.FireService");
????}
????public?FastJsonRedisSerializer(Class<T>?clazz)?{
????????super();
????????this.clazz?=?clazz;
????}

????@Override
????public?byte[]?serialize(T?t)?throws?SerializationException?{
????????if?(null?==?t)?{
????????????return?new?byte[0];
????????}
????????return?JSON.toJSONString(t,?SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
????}

????@Override
????public?T?deserialize(byte[]?bytes)?throws?SerializationException?{
????????if?(null?==?bytes?||?bytes.length?<=?0)?{
????????????return?null;
????????}
????????String?str?=?new?String(bytes,?DEFAULT_CHARSET);
????????return?(T)?JSON.parseObject(str,?clazz);
????}

}

@Cacheable：查询
可选属性：
cacheNames/value：指定缓存组件的名字；
key：缓存数据使用的key，可以用来指定。默认即使用方法参数的值
keyGenerator：key的生成器，可以自己指定key的生成器的组件id

//自定义配置类配置keyGenerator
@Configuration
public?class?MyCacheConfig?{
????@Bean("myKeyGenerator")
????public?KeyGenerator?keyGenerator(){
????????return?new?KeyGenerator()?{
????????????@Override
????????????public?Object?generate(Object?target,?Method?method,?Object...?params)?{
????????????????return?method.getName()+"["+?Arrays.asList(params).toString()?+"]";
????????????}
????????};
????}
}

cacheManager：指定缓存管理器；或者cacheResolver获取指定解析器

condition：指定符合条件的情况下才缓存；如condition="#id>0"

unless:否定缓存，当unless指定的条件为true，方法的返回值不会被缓存，可以获取到结果进行判断;如unless="#result==null";

sync：是否使用异步模式

例如：

@Cacheable(value?=?"RedisInfo",?key?=?"#root.methodName+'['+#account+']'")
@ResponseBody
@RequestMapping("/RedisTest")
public?Result?findUserOrder(String?account)?throws?Exception{
????if(account!=null)?{
????????List<Map<String,?Object>>?list=orderFindGoods.findUserOrder(account);
????????return?Results.successWithData(list,?BaseEnums.SUCCESS.code(),?BaseEnums.SUCCESS.desc());
????}else?{
????????return?Results.failure();
????}
}

运行项目查看结果

1.第一次访问

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