1.先导入pom依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
2.在application.yml中配置的redis信息
spring:
redis:
database: 0
host: 192.168.147.144
port: 6379
password: 123456
jedis:
pool:
max-active: 100
max-idle: 3
max-wait: -1
min-idle: 0
timeout: 1000
3.创建RedisConfig.java(相当于Beans)
package com.company.springboot05.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.CachingConfigurerSupport;
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.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import java.lang.reflect.Method;
import java.time.Duration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* redis配置类
**/
//@Configuration可理解为用spring的时候xml里面的<beans>标签。
@Configuration
@EnableCaching//开启注解式缓存
//继承CachingConfigurerSupport,为了自定义生成KEY的策略。可以不继承。
public class RedisConfig extends CachingConfigurerSupport {
/**
* 生成redis中的主键的key的策略 根据类名+方法名+所有参数的值生成唯一的一个key
*
* @return
*/
@Bean
@Override
public KeyGenerator keyGenerator() {
return new KeyGenerator() {
@Override
public 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();
}
};
}
/**
* 管理缓存
*
* @param redisConnectionFactory
* @return
*/
@Bean
public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
//通过Spring提供的RedisCacheConfiguration类,构造一个自己的redis配置类,从该配置类中可以设置一些初始化的缓存命名空间
// 及对应的默认过期时间等属性,再利用RedisCacheManager中的builder.build()的方式生成cacheManager:
RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig(); // 生成一个默认配置,通过config对象即可对缓存进行自定义配置
config = config.entryTtl(Duration.ofMinutes(1)) // 设置缓存的默认过期时间,也是使用Duration设置
.disableCachingNullValues(); // 设置不缓存空值
// 设置一个初始化的缓存空间set集合
Set<String> cacheNames = new HashSet<>();
// 设置不同名字的缓存空间
cacheNames.add("my-redis-cache1");
cacheNames.add("my-redis-cache2");
// 对每个缓存空间应用不同的配置
Map<String, RedisCacheConfiguration> configMap = new HashMap<>();
configMap.put("my-redis-cache1", config);
configMap.put("my-redis-cache2", config.entryTtl(Duration.ofSeconds(1200)));
RedisCacheManager cacheManager = RedisCacheManager.builder(redisConnectionFactory) // 使用自定义的缓存配置初始化一个cacheManager
.initialCacheNames(cacheNames) // 注意这两句的调用顺序,一定要先调用该方法设置初始化的缓存名,再初始化相关的配置
.withInitialCacheConfigurations(configMap)
.build();
return cacheManager;
}
@Bean
public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
RedisTemplate<Object, Object> template = new RedisTemplate<>();
template.setConnectionFactory(connectionFactory);
//使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值(默认使用JDK的序列化方式)
Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
serializer.setObjectMapper(mapper);
template.setValueSerializer(serializer);
//使用StringRedisSerializer来序列化和反序列化redis的key值
template.setKeySerializer(new StringRedisSerializer());
template.afterPropertiesSet();
return template;
}
@Bean
public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory factory) {
StringRedisTemplate stringRedisTemplate = new StringRedisTemplate();
stringRedisTemplate.setConnectionFactory(factory);
return stringRedisTemplate;
}
}
4.使用
// @Cacheable 可读可取 @CachePut 只读不取 两者的配置如value,key等都相同
// value 设置存储在名字为my-redis-cache1的缓存空间中(可在cacheManager方法中设置缓存空间)
// key = "'book'+#bookId" : 代表当在redis中生成的键为'book'字符串加上bookId这个参数
// condition = "#bookId>10" : 代表当参数bookId>10才存入缓存中
// @Cacheable(value = "my-redis-cache1", key = "'book'+#bookId",condition = "#bookId>10")
@CachePut("my-redis-cache2")
public TBoook selectByPrimaryKey(Long bookId) {
return tBoookMapper.selectByPrimaryKey(bookId);
}