spring boot cache 整合 redis

﹏ヽ暗。殇╰゛Y 2022-02-18 12:59 287阅读 0赞

关于 Spring Cache 注解请查看：[Spring Cache 注解详解][Spring Cache]

Redis的安装教程：[https://blog.csdn.net/LDY1016/article/details/76083162][https_blog.csdn.net_LDY1016_article_details_76083162]

下面进入正题。。。

1、在pom.xml中添加redis的依赖

<dependency>
    	<groupId>org.springframework.boot</groupId>
    	<artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
    	<groupId>org.apache.commons</groupId>
    	<artifactId>commons-pool2</artifactId>
    </dependency>

2、在application.properties文件中配置redis缓存

#redis
    spring.redis.host=127.0.0.1
    spring.redis.port = 6379
    #spring.redis.password=
    # 连接超时时间（毫秒）
    spring.redis.timeout=10000
    # Redis默认情况下有16个分片，这里配置具体使用的分片
    spring.redis.database=0
    # 连接池最大连接数（使用负值表示没有限制） 默认 8
    spring.redis.lettuce.pool.max-active=8
    # 连接池最大阻塞等待时间（使用负值表示没有限制） 默认 -1
    spring.redis.lettuce.pool.max-wait=-1
    # 连接池中的最大空闲连接 默认 8
    spring.redis.lettuce.pool.max-idle=8
    # 连接池中的最小空闲连接 默认 0
    spring.redis.lettuce.pool.min-idle=0
    
    
    #cache
    # 一般来说是不用配置的，Spring Cache 会根据依赖的包自行装配
    spring.cache.type=redis

3、配置RedisConfig

package com.ldy.bootv2.demo;
    
    import java.time.Duration;
    
    import org.springframework.cache.CacheManager;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Primary;
    import org.springframework.data.redis.cache.RedisCacheConfiguration;
    import org.springframework.data.redis.cache.RedisCacheManager;
    import org.springframework.data.redis.cache.RedisCacheWriter;
    import org.springframework.data.redis.connection.RedisConnectionFactory;
    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
    import org.springframework.data.redis.serializer.RedisSerializationContext;
    import org.springframework.data.redis.serializer.RedisSerializer;
    import org.springframework.data.redis.serializer.StringRedisSerializer;
    
    @Configuration
    public class RedisConfig {
    
    	@Bean
    	public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
    
    		RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
    
    		redisTemplate.setConnectionFactory(redisConnectionFactory);
    		redisTemplate.setKeySerializer(keySerializer());
    		redisTemplate.setHashKeySerializer(keySerializer());
    		redisTemplate.setValueSerializer(valueSerializer());
    		redisTemplate.setHashValueSerializer(valueSerializer());
    		return redisTemplate;
    	}
    
    	@Primary
    	@Bean
    	public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
    		// 缓存配置对象
    		RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
    
    		redisCacheConfiguration = redisCacheConfiguration.entryTtl(Duration.ofMinutes(30L)) // 设置缓存的默认超时时间：30分钟
    				.disableCachingNullValues() // 如果是空值，不缓存
    				.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(keySerializer())) // 设置key序列化器
    				.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer((valueSerializer()))); // 设置value序列化器
    
    		return RedisCacheManager.builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))
    				.cacheDefaults(redisCacheConfiguration).build();
    	}
    
    	private RedisSerializer<String> keySerializer() {
    		return new StringRedisSerializer();
    	}
    
    	private RedisSerializer<Object> valueSerializer() {
    		return new GenericJackson2JsonRedisSerializer();
    	}
    }

4、在启动类上加上@EnableCaching注解开启缓存

package com.ldy.bootv2.demo;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cache.annotation.EnableCaching;
    
    @EnableCaching
    @SpringBootApplication
    public class BootV2App {
    
    	public static void main(String[] args) {
    		SpringApplication.run(BootV2App.class, args);
    	}
    }

5、在service层加入缓存

package com.ldy.bootv2.demo.service;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cache.annotation.CacheEvict;
    import org.springframework.cache.annotation.CachePut;
    import org.springframework.cache.annotation.Cacheable;
    import org.springframework.cache.annotation.Caching;
    import org.springframework.stereotype.Service;
    
    import com.ldy.bootv2.demo.entity.UserEntity;
    import com.ldy.bootv2.demo.mapper.UserMapper;
    
    @Service
    public class UserService {
    
    	@Autowired
    	UserMapper userMapper;
    
    	@Cacheable(value = "user", key = "'list'", unless = "#result == null") // unless="#result == null"表示返回结果为空时不缓存
    	public List<UserEntity> getAll() {
    		return userMapper.getAll();
    	}
    
    	@Cacheable(value = "user", key = "#id", unless = "#result == null") // unless="#result == null"表示返回结果为空时不缓存
    	public UserEntity getOne(Integer id) {
    		return userMapper.getOne(id);
    	}
    
    	@CachePut(value = "user", key = "#entity.id") // 将返回结果更新到缓存中
    	@CacheEvict(value = "user", key = "'list'") // list数据有变更，清空list缓存
    	public UserEntity insert(UserEntity entity) {
    		userMapper.insert(entity);
    		return entity;
    	}
    
    	@CachePut(value = "user", key = "#entity.id") // 将返回结果更新到缓存中
    	@CacheEvict(value = "user", key = "'list'") // list数据有变更，清空list缓存
    	public UserEntity update(UserEntity entity) {
    		userMapper.update(entity);
    		return entity;
    	}
    
    	@Caching(evict = { @CacheEvict(value = "user", key = "#id"), @CacheEvict(value = "user", key = "'list'") })
    	// @CacheEvict(value = "user", key = "#id")//清除指定id的缓存
    	// @CacheEvict(value="user", allEntries=true)//allEntries为true时，将忽略指定的key，清除全部user缓存
    	public void delete(Integer id) {
    		userMapper.delete(id);
    	}
    
    }

上述代码亲测有效，有问题欢迎留言！！！

[Spring Cache]: https://blog.csdn.net/LDY1016/article/details/89356390
[https_blog.csdn.net_LDY1016_article_details_76083162]: https://blog.csdn.net/LDY1016/article/details/76083162