版权声明：LT https://blog.csdn.net/LitongZero/article/details/88260242
SpringBoot2.0 整合 Redis
文章目录
1.背景
本文就不说Redis的好处了。
2.环境
①SpringBoot:2.1.0.RELEASE
3.引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
版本就不用加了，直接继承使用SpringBoot父工程的版本号
4.新建配置类
RedisConfig.java
/**
* @Author: litong
* @Description:
* @Date: Created in 10:59 2018/1/12
* @Modified By:
*/
@Configuration
public class RedisConfig extends CachingConfigurerSupport {
@Bean
public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
RedisTemplate<String, Object> template = new RedisTemplate<>();
RedisSerializer<String> redisSerializer = new StringRedisSerializer();
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
template.setConnectionFactory(factory);
//key序列化方式
template.setKeySerializer(redisSerializer);
//value序列化
template.setValueSerializer(jackson2JsonRedisSerializer);
//value hashmap序列化
template.setHashValueSerializer(jackson2JsonRedisSerializer);
return template;
}
@Bean
public CacheManager 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);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
// 配置序列化（解决乱码的问题）,过期时间30秒
RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofSeconds(30))
.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
.disableCachingNullValues();
RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
.cacheDefaults(config)
.build();
return cacheManager;
}
}
5.新建RedisService
RedisService.java
public interface RedisService {
boolean expire(String key, long time);
long getExpire(String key);
boolean hasKey(String key);
void del(String key);
String get(String key);
/**
* 加入Redis缓存
* @param key
* @param value
* @return
*/
boolean set(String key, String value);
boolean set(String key, String value, long time);
long incr(String key, long delta);
}
6.实现RedisService
RedisServiceImpl.java
@Service
public class RedisServiceImpl implements RedisService {
@Autowired
private StringRedisTemplate redisTemplate;
@Override
public boolean expire(String key,long time){
try {
if(time>0){
redisTemplate.expire(key, time, TimeUnit.SECONDS);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 根据key 获取过期时间
* @param key 键 不能为null
* @return 时间(秒) 返回0代表为永久有效
*/
@Override
public long getExpire(String key){
return redisTemplate.getExpire(key,TimeUnit.SECONDS);
}
/**
* 判断key是否存在
* @param key 键
* @return true 存在 false不存在
*/
@Override
public boolean hasKey(String key){
try {
return redisTemplate.hasKey(key);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 删除缓存
* @param key 可以传一个值 或多个
*/
@Override
public void del(String key){
redisTemplate.delete(key);
}
//============================String=============================
/**
* 普通缓存获取
* @param key 键
* @return 值
*/
@Override
public String get(String key){
return key==null?null:redisTemplate.opsForValue().get(key);
}
/**
* 普通缓存放入
* @param key 键
* @param value 值
* @return true成功 false失败
*/
@Override
public boolean set(String key,String value) {
try {
redisTemplate.opsForValue().set(key, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 普通缓存放入并设置时间
* @param key 键
* @param value 值
* @param time 时间(秒) time要大于0 如果time小于等于0 将设置无限期
* @return true成功 false 失败
*/
@Override
public boolean set(String key,String value,long time){
try {
if(time>0){
redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
}else{
set(key, value);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
@Override
public long incr(String key, long delta){
if(delta<0){
throw new RuntimeException("递增因子必须大于0");
}
return redisTemplate.opsForValue().increment(key, delta);
}
}
使用依赖注入方便后续更换RedisServiceImpl实现类。
7.使用
使用时，先注入
@Autowired
private RedisService redisService;