这篇文章将为大家详细讲解有关Redis中如何实现订单自动过期功能，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
前言
用户下单后，规定XX分钟后自动设置为“已过期”，不能再发起支付。项目类似此类"过期"的需求，笔者提供一种使用Redis的解决思路，结合Redis的订阅、发布和键空间通知机制（Keyspace Notifications）进行实现。
配置redis.confg
notify-keyspace-events选项默认是不启用，改为notify-keyspace-events “Ex”。重启生效，索引位i的库，每当有过期的元素被删除时，向**keyspace@:expired**频道发送通知。
E表示键事件通知，所有通知以__keyevent@__:expired为前缀；
x表示过期事件，每当有过期被删除时发送。
与SpringBoot进行集成
①注册JedisConnectionFactory
import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.connection.RedisPassword;import org.springframework.data.redis.connection.RedisStandaloneConfiguration;import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;@Configurationpublic class RedisConfig { @Value("${redis.pool.maxTotal}") private Integer maxTotal; @Value("${redis.pool.minIdle}") private Integer minIdle; @Value("${redis.pool.maxIdle}") private Integer maxIdle; @Value("${redis.pool.maxWaitMillis}") private Integer maxWaitMillis; @Value("${redis.url}") private String redisUrl; @Value("${redis.port}") private Integer redisPort; @Value("${redis.timeout}") private Integer redisTimeout; @Value("${redis.password}") private String redisPassword; @Value("${redis.db.payment}") private Integer paymentDataBase; private JedisPoolConfig jedisPoolConfig() { JedisPoolConfig config = new JedisPoolConfig(); config.setMaxTotal(maxTotal); config.setMinIdle(minIdle); config.setMaxIdle(maxIdle); config.setMaxWaitMillis(maxWaitMillis); return config; } @Bean public JedisPool jedisPool() { JedisPoolConfig config = this.jedisPoolConfig(); JedisPool jedisPool = new JedisPool(config, redisUrl, redisPort, redisTimeout, redisPassword); return jedisPool; } @Bean(name = "jedisConnectionFactory") public JedisConnectionFactory jedisConnectionFactory() { RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration(); redisStandaloneConfiguration.setDatabase(paymentDataBase); redisStandaloneConfiguration.setHostName(redisUrl); redisStandaloneConfiguration.setPassword(RedisPassword.of(redisPassword)); redisStandaloneConfiguration.setPort(redisPort); return new JedisConnectionFactory(redisStandaloneConfiguration); }}②注册监听器
import org.springframework.data.redis.connection.Message;import org.springframework.data.redis.connection.MessageListener;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;@Service(value ="paymentListener")public class PaymentListener implements MessageListener { @Override @Transactional public void onMessage(Message message, byte[] pattern) { // 过期事件处理流程 }}③配置订阅对象
import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.autoconfigure.AutoConfigureAfter;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;import org.springframework.data.redis.listener.PatternTopic;import org.springframework.data.redis.listener.RedisMessageListenerContainer;import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;@Configuration@AutoConfigureAfter(value = RedisConfig.class)public class PaymentListenerConfig { @Autowired @Qualifier(value = "paymentListener") private PaymentListener paymentListener; @Autowired @Qualifier(value = "paymentListener") private JedisConnectionFactory connectionFactory; @Value("${redis.db.payment}") private Integer paymentDataBase; @Bean RedisMessageListenerContainer redisMessageListenerContainer(MessageListenerAdapter listenerAdapter) { RedisMessageListenerContainer container = new RedisMessageListenerContainer(); container.setConnectionFactory(connectionFactory); // 监听paymentDataBase 库的过期事件 String subscribeChannel = "__keyevent@" + paymentDataBase + "__:expired"; container.addMessageListener(listenerAdapter, new PatternTopic(subscribeChannel)); return container; } @Bean MessageListenerAdapter listenerAdapter() { return new MessageListenerAdapter(paymentListener); }}paymentDataBase 库元素过期后就会跳入PaymentListener 的onMessage(Message message, byte[] pattern)方法。
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