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SpringBoot配置Redis自定义过期时间操作

2021-10-26 10:55悦澜群书 Java教程

这篇文章主要介绍了SpringBoot配置Redis自定义过期时间操作,具有很好的参考价值,希望对大家有所帮助。如有错误或未考虑完全的地方,望不吝赐教

SpringBoot配置Redis自定义过期时间

Redis配置依赖

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<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-redis</artifactId>
        <version>1.4.4.RELEASE</version>
      </dependency>
      <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-redis</artifactId>
        <version>1.8.1.RELEASE</version>
      </dependency>
      <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>2.9.0</version>
</dependency>

SpringBoot-Reids配置文件

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package com.regs.tms.common.redis;
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@Configuration
@EnableCaching// 启用缓存,这个注解很重要
@ConfigurationProperties(prefix = "spring.redis")
@Data
public class RedisCacheConfig extends CachingConfigurerSupport {
    private String host;
    private Integer port;
    private Integer database;
    private String password;
 
    @Bean("redisTemplate")
    public RedisTemplate redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate();
        template.setConnectionFactory(factory);
        //使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
        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);
        template.setHashValueSerializer(serializer);
        // 设置键(key)的序列化采用StringRedisSerializer。
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        //打开事务支持
        template.setEnableTransactionSupport(true);
        template.afterPropertiesSet();
        return template;
    }
 
    @Bean
    public PlatformTransactionManager transactionManager(DataSource dataSource) throws SQLException {
        //配置事务管理器
        return new DataSourceTransactionManager(dataSource);
    }
 
    @Bean("stringRedisTemplate")
    public StringRedisTemplate stringRedisTemplate() {
        Integer port = this.port == null ? 6379 : this.port;
        JedisConnectionFactory jedis = new JedisConnectionFactory();
        jedis.setHostName(host);
        jedis.setPort(port);
        if (StringUtils.isNotEmpty(password)) {
            jedis.setPassword(password);
        }
        if (database != null) {
            jedis.setDatabase(database);
        } else {
            jedis.setDatabase(0);
        }
        // 初始化连接pool
        jedis.afterPropertiesSet();
        // 获取连接template
        StringRedisTemplate temple = new StringRedisTemplate();
        temple.setConnectionFactory(jedis);
        return temple;
    }
}

自定义失效注解

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package com.regs.tms.common.redis.annotation;
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@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
public @interface CacheDuration {
    //Sets the expire time (in seconds).
    public long duration() default 60;
}

自定义失效配置

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package com.regs.tms.common.redis.annotation;
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/**
 * ExpireCacheManager,继承自RedisCacheManager,
 * 用于对@CacheExpire解析及有效期的设置
 */
public class RedisExpireCacheManager extends RedisCacheManager implements ApplicationContextAware, InitializingBean {
    private ApplicationContext applicationContext;
 
    public RedisExpireCacheManager(RedisTemplate redisTemplate) {
        super(redisTemplate);
    }
 
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
 
    @Override
    public void afterPropertiesSet() {
        parseCacheExpire(applicationContext);
    }
 
    private void parseCacheExpire(ApplicationContext applicationContext) {
        final Map<String, Long> cacheExpires = new HashMap<>(16);
        //扫描有注解
        String[] beanNames = applicationContext.getBeanNamesForAnnotation(Cacheable.class);
        for (String beanName : beanNames) {
            final Class clazz = applicationContext.getType(beanName);
            addCacheExpires(clazz, cacheExpires);
        }
        //设置有效期
        super.setExpires(cacheExpires);
    }
 
    private void addCacheExpires(final Class clazz, final Map<String, Long> cacheExpires) {
        ReflectionUtils.doWithMethods(clazz, new ReflectionUtils.MethodCallback() {
            @Override
            public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
                ReflectionUtils.makeAccessible(method);
                //根据CacheExpire注解获取时间
                CacheExpire cacheExpire = findCacheExpire(clazz, method);
                if (cacheExpire != null) {
                    Cacheable cacheable = findAnnotation(method, Cacheable.class);
                    String[] cacheNames = isEmpty(cacheable.value()) ? new String[]{} : cacheable.value();
                    for (String cacheName : cacheNames) {
                        cacheExpires.put(cacheName, cacheExpire.expire());
                    }
                }
            }
        }, new ReflectionUtils.MethodFilter() {
            @Override
            public boolean matches(Method method) {
                return null != findAnnotation(method, Cacheable.class);
            }
        });
    }
 
    /**
     * CacheExpire标注的有效期,优先使用方法上标注的有效期
     *
     * @param clazz
     * @param method
     * @return
     */
    private CacheExpire findCacheExpire(Class clazz, Method method) {
        CacheExpire methodCache = findAnnotation(method, CacheExpire.class);
        if (null != methodCache) {
            return methodCache;
        }
        CacheExpire classCache = findAnnotation(clazz, CacheExpire.class);
        if (null != classCache) {
            return classCache;
        }
        return null;
    }
}

spring boot 使用redis 超时时间重新设置

如果要计算每24小时的下单量,

通常的做法是,取出旧值,进行加一在设置回去,

但是这样就出现了一个问题

第二次设置值的时候,把超时时间重新设置成个24小时

这样无疑的记录24小时的数量是不准确的

并且spring boot 中,默认使用了spring 来操作redis ,使存在每个redis中的值,都会加前面加入一些东西

1) "\xac\xed\x00\x05t\x00\x0bREDISUALIST"

SpringBoot配置Redis自定义过期时间操作

我们在查找每个值的时候,并不知道在key前面需要加点什么.

所以我们必须要用keys 这个命令 ,来匹配 我们需要查找的key,来取第一个

然后我们用 ttl 命令 返回指定key的剩余时间 ,重新设置回去,而不是设置24小时,这样就实现了24小时累加一次

在redisService 中,增加一个方法

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/**
     * 获取指定key的剩余超时时间,key最好是唯一的,有特点的,最好不要匹配出多个 例子 *111 取出 "\xac\xed\x00\x05t\x00\x0b111"
     * 返回剩余秒数
     * @param key
     * @return
     * create by jcd
     */
    public Long ttlByKey(@NotNull String key){
        Set<byte[]> keys = redisTemplate.getConnectionFactory().getConnection().keys(key.getBytes());
        byte[] bytes = keys.stream().findFirst().get();
        Long ttl = redisTemplate.getConnectionFactory().getConnection().ttl(bytes);
        return ttl;
    }

以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。

原文链接:https://blog.csdn.net/qq_31973845/article/details/85067252

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