1.依赖和配置：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
RedisConfig：
package com.english.english_vision.config;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.data.redis.cache.RedisCacheManager;
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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.*;
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;
@EnableCaching
@Configuration
public class RedisConfig extends CachingConfigurerSupport {
private Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer() {
Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer =
new Jackson2JsonRedisSerializer<>(Object.class);
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
objectMapper.configure(MapperFeature.USE_ANNOTATIONS, false);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
// 此项必须配置，否则会报java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to XXX
objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
return jackson2JsonRedisSerializer;
}
@Bean
public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
RedisTemplate<String, Object> template = new RedisTemplate<>();
// 配置连接工厂
template.setConnectionFactory(factory);
//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 jacksonSeial = new Jackson2JsonRedisSerializer(Object.class);
ObjectMapper om = new ObjectMapper();
// 指定要序列化的域，field,get和set,以及修饰符范围，ANY是都有包括private和public
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
// 指定序列化输入的类型，类必须是非final修饰的，final修饰的类，比如String,Integer等会跑出异常
//om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
jacksonSeial.setObjectMapper(om);
// 值采用json序列化
template.setValueSerializer(jacksonSeial);
//使用StringRedisSerializer来序列化和反序列化redis的key值
template.setKeySerializer(new StringRedisSerializer());
// 设置hash key 和value序列化模式
template.setHashKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(jacksonSeial);
template.afterPropertiesSet();
return template;
}
@Bean
public RedisCacheManager cacheManager(RedisConnectionFactory factory) {
RedisSerializer<String> redisSerializer = new StringRedisSerializer();
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
//解决查询缓存转换异常的问题
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
jackson2JsonRedisSerializer.setObjectMapper(om);
//配置序列化(解决乱码的问题)
RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofDays(30))
.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
.disableCachingNullValues();
RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
.cacheDefaults(config)
.build();
return cacheManager;
}
@Bean
public HashOperations<String, String, Object> hashOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForHash();
}
/**
* 对redis字符串类型数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public ValueOperations<String, Object> valueOperations(RedisTemplate<String, Object> redisTemplate) {
Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
redisTemplate.setKeySerializer(jackson2JsonRedisSerializer);
redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
redisTemplate.setHashKeySerializer(jackson2JsonRedisSerializer);
redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
redisTemplate.afterPropertiesSet();
return redisTemplate.opsForValue();
}
/**
* 对链表类型的数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public ListOperations<String, Object> listOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForList();
}
/**
* 对无序集合类型的数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public SetOperations<String, Object> setOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForSet();
}
/**
* 对有序集合类型的数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public ZSetOperations<String, Object> zSetOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForZSet();
}
@Bean("myGenerator")
public KeyGenerator keyGenerator()
{
return new KeyGenerator() {
@Override
public Object generate(Object target, Method method, Object... objects) {
StringBuilder sb = new StringBuilder();
sb.append(target.getClass().getName());
sb.append(method.getName());
for(Object obj:objects)
sb.append(obj.toString());
return sb.toString();
}
};
}
}
2.操作数据库（查询缓存）：
service:
public interface ISongService extends IService<Song> {
List<Song> listbyName(String name);
}
@Service
public class SongServiceImpl extends ServiceImpl<SongMapper, Song> implements ISongService {
@Autowired
private RedisService redisService;
@Autowired
private SongMapper songMapper;
@Autowired
private RedisTemplate redisTemplate;
@Override
public List<Song> listbyName(String name) {
List<Song> songs = null;
String key = "songlist:"+name ;
ValueOperations<String, List<Song>> operations = redisTemplate.opsForValue();
//判断redis中是否有键为key的缓存
boolean hasKey = redisTemplate.hasKey(key);
if(hasKey) {
songs = operations.get(key);
return songs;
}
else {
songs = songMapper.listbyName(name);
operations.set(key,songs,3, TimeUnit.HOURS);
}
System.out.println("mapper查询");
return songMapper.listbyName(name);
}
}
controller:
@ApiOperation(value="查询歌曲")
@RequestMapping(value = "/query", method = RequestMethod.POST)
public ResponseResult querySong(
@ApiParam(name="name",value="歌名",required=true)
@RequestParam("name")String name)
{
// List<Song> songs = songService.listbyName(new LambdaQueryWrapper<Song>().eq(Song::getName,name));
List<Song> songs = songService.listbyName(name);
if(songs == null) return ResponseResult.error(ResponseEnum.DIARY_NOT_EXIST);
List<SongVo> songVos = songs.stream().map(e->{
SongVo songVo = new SongVo();
BeanUtils.copyBeanProp(songVo,e);
return songVo;
}).collect(Collectors.toList());
int numbers = songVos.size();
PageResult pageResult = new PageResult<>(songVos,numbers);
return ResponseResult.success(pageResult);
}
mapper
<select id="listbyName" resultType="com.english.english_vision.pojo.Song">
select * from t_song where name like "%"#{
name}"%"
</select>
3.结果：
多次发起请求只打印了一次sql,可以说明后面几次是从缓存中取出的
查看redis数据库：
