SpringBoot2.4.2下怎么使用Redis配置Lettuce

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1. Springboot2.4.2下对Redis的基础集成

1.1 maven添加依赖

 <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-redis</artifactId>             <version>2.4.2</version>        </dependency>

注：Springboot2.4.2下默认使用的就是Lettuce而不是Jedis因此无需在依赖进行排除Jedis

1.2 添加Redis配置文件

首先Redis需要准备一个配置文件，本文设定一个单独的文件redis.properties 放在resource文件夹下

redis.properties

hostName = localhost  port = 6379  password = password  pool.maxIdle = 10000  pool.minIdle = 1000  pool.maxWaitMillis = 5000  pool.maxTotal = 2  database = 10

1.3 注册RedisTemplate和StringRedisTemplate的Bean

LettuceRedisConfig.java

package com.xxx.demo.redis;import com.fasterxml.jackson.databind.ObjectMapper;import org.apache.commons.pool2.impl.GenericObjectPoolConfig;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;import org.springframework.data.redis.connection.RedisStandaloneConfiguration;import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;import org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;import org.springframework.data.redis.serializer.StringRedisSerializer;import java.io.Serializable;import java.time.Duration;@Configuration@PropertySource("classpath:redis.properties")public class LettuceRedisConfig {    @Value("${hostName}")    private String hostName;    @Value("${password}")    private String password;    @Value("${port}")    private int port;    @Value("${database}")    private int database;    @Value("${pool.maxIdle}")    private int maxIdle;    @Value("${pool.minIdle}")    private int minIdle;    @Value("${pool.maxWaitMillis}")    private int maxWaitMillis;    @Value("${pool.maxTotal}")    private int maxTotal;        @Bean    public LettuceConnectionFactory redisConnectionFactory() {        RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration ();        redisStandaloneConfiguration.setHostName (hostName);        redisStandaloneConfiguration.setPort (port);        redisStandaloneConfiguration.setPassword (password);        redisStandaloneConfiguration.setDatabase (database);        GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig ();        poolConfig.setMaxIdle (maxIdle);        poolConfig.setMinIdle (minIdle);        poolConfig.setMaxWaitMillis (maxWaitMillis);        poolConfig.setMaxTotal (maxTotal);        LettucePoolingClientConfiguration lettucePoolingClientConfiguration =                LettucePoolingClientConfiguration.builder ().commandTimeout (Duration.ofSeconds (10)).shutdownTimeout (Duration.ZERO).poolConfig (poolConfig).build ();        LettuceConnectionFactory lettuceConnectionFactory =                new LettuceConnectionFactory (redisStandaloneConfiguration, lettucePoolingClientConfiguration);        lettuceConnectionFactory.setShareNativeConnection (false);        return lettuceConnectionFactory;    }        @Bean    public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory) {        RedisTemplate<String, Serializable> redisTemplate = new RedisTemplate<> ();        redisTemplate.setKeySerializer (new StringRedisSerializer ());        redisTemplate.setValueSerializer (new GenericJackson2JsonRedisSerializer ());        redisTemplate.setConnectionFactory (connectionFactory);        return redisTemplate;    }        @Bean    public StringRedisTemplate configStringRedisTemplate(@Autowired LettuceConnectionFactory factory) {        StringRedisTemplate template = new StringRedisTemplate (factory);        template.setEnableTransactionSupport (true);        ObjectMapper mapper;        GenericJackson2JsonRedisSerializer jackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer ();        template.setValueSerializer (new StringRedisSerializer ());        template.setKeySerializer (new StringRedisSerializer ());        template.setHashKeySerializer (new StringRedisSerializer ());        template.setHashValueSerializer (new StringRedisSerializer ());        template.afterPropertiesSet ();        return template;    }}

1.4 编写一个控制器示例进行redis操作

package com.xx.demo.controller;import com.xxx.demo.redis.MessagePublisher;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping("redis")public class RedisController {    final    StringRedisTemplate redisTemplate;    public RedisController(StringRedisTemplate redisTemplate) {        this.redisTemplate = redisTemplate;       }    @GetMapping("add")    public String add() {        redisTemplate.opsForValue ().set ("a", "1");        return "hi";    }}

2. 使用redis进行发布订阅

2.1 添加一个发布者的接口

package com.xxx.demo.redis;public interface MessagePublisher {    void publish(final String message);}

2.2 添加一个发布者的实现类

RedisMessagePublisher.java

package com.xxx.demo.redis;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.listener.ChannelTopic;import java.io.Serializable;public class RedisMessagePublisher implements MessagePublisher {    @Autowired    private RedisTemplate<String, Serializable> redisTemplate;    @Autowired    private ChannelTopic topic;    public RedisMessagePublisher() {    }    public RedisMessagePublisher(final RedisTemplate<String, Serializable> redisTemplate, final ChannelTopic topic) {        this.redisTemplate = redisTemplate;        this.topic = topic;    }    @Override    public void publish(final String message) {        redisTemplate.convertAndSend (topic.getTopic (), message);    }}

2.3 添加一个消息监听bean

RedisMessageSubscriber.java

package com.xxx.demo.redis;import org.springframework.data.redis.connection.Message;import org.springframework.data.redis.connection.MessageListener;import org.springframework.scheduling.annotation.Async;public class RedisMessageSubscriber implements MessageListener {    @Override    @Async    public void onMessage(Message message, byte[] pattern) {        System.out.println ("Message received: " + new String (message.getBody ()));    }}

2.4 添加bean注册

RedisMessageConfig.java

package com.xxx.demo.redis;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.listener.ChannelTopic;import org.springframework.data.redis.listener.RedisMessageListenerContainer;import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;import java.io.Serializable;@Configurationpublic class RedisMessageConfig {    @Bean    MessageListenerAdapter messageListener() {        return new MessageListenerAdapter (new RedisMessageSubscriber ());    }    @Bean    RedisMessageListenerContainer redisContainer(LettuceConnectionFactory factory) {        final RedisMessageListenerContainer container = new RedisMessageListenerContainer ();        container.setConnectionFactory (factory);        container.addMessageListener (messageListener (), topic ());        return container;    }    @Bean    MessagePublisher redisPublisher(@Autowired RedisTemplate<String, Serializable> redisTemplate) {        return new RedisMessagePublisher (redisTemplate, topic ());    }    @Bean    ChannelTopic topic() {        return new ChannelTopic ("pubsub:queue");    }}

2.5 改写之前的控制器如下

package com.xxx.demo.controller;import com.kreakin.demo.redis.MessagePublisher;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping("redis")public class RedisController {    final    StringRedisTemplate redisTemplate;    final    MessagePublisher publisher;    public RedisController(StringRedisTemplate redisTemplate, MessagePublisher publisher) {        this.redisTemplate = redisTemplate;        this.publisher = publisher;    }    @GetMapping("hi")    public String hi() {        redisTemplate.opsForValue ().set ("a", "1");        return "hi";    }    @GetMapping("pub")    public String pub() {        publisher.publish ("sdfsf");        return "ok";    }}

3. 监听key的过期事件

RedisKeyExpireSubscriber.java

package com.xxx.demo.redis;import lombok.extern.slf4j.Slf4j;import org.springframework.data.redis.connection.Message;import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;import org.springframework.data.redis.listener.RedisMessageListenerContainer;import org.springframework.stereotype.Component;@Slf4j@Componentpublic class RedisKeyExpireSubscriber extends KeyExpirationEventMessageListener {        public RedisKeyExpireSubscriber(RedisMessageListenerContainer listenerContainer) {        super (listenerContainer);    }    @Override    public void onMessage(Message message, byte[] pattern) {        log.error (message.toString ());    }}

注意： Redis需要开启事件

感谢各位的阅读，以上就是“SpringBoot2.4.2下怎么使用Redis配置Lettuce”的内容了，经过本文的学习后，相信大家对SpringBoot2.4.2下怎么使用Redis配置Lettuce这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！