springboot redis 实现消息队列

在Spring Boot中使用Redis作为消息队列，可以通过以下步骤实现：

1. 添加依赖

在`pom.xml`文件中添加Spring Boot Redis和Jedis的依赖：

```xml

   
   
        org.springframework.boot
        spring-boot-starter-data-redis
   
   
   
        redis.clients
        jedis
   

```

2. 配置Redis

在`application.properties`文件中配置Redis连接信息：

```properties
spring.redis.host=localhost
spring.redis.port=6379
```

3. 创建生产者

创建一个生产者类，用于发送消息到Redis消息队列：

```java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

@Component
public class Producer {

    @Autowired
    private RedisTemplate redisTemplate;

    public void sendMessage(String key, String message) {
        redisTemplate.convertAndSend(key, message);
    }
}
```

4. 创建消费者

创建一个消费者类，用于从Redis消息队列接收消息：

```java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

@Component
public class Consumer implements MessageListener {

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    public void onMessage(Message message, byte[] pattern) {
        System.out.println("Received message: " + message.toString());
    }
}
```

5. 配置消费者监听

在配置类中，将消费者添加到Redis消息队列的监听器列表中：

```java
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.RedisConnectionFactory;
import org.springframework.data.redis.listener.ChannelTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfig {

    @Autowired
    private Consumer consumer;

    @Bean
    public RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory,
                                                  MessageListenerAdapter listenerAdapter) {
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.addMessageListener(listenerAdapter, topic());
        return container;
    }

    @Bean
    public MessageListenerAdapter listenerAdapter() {
        return new MessageListenerAdapter(consumer, "onMessage");
    }

    @Bean
    public ChannelTopic topic() {
        return new ChannelTopic("messageQueue");
    }
}
```

6. 测试发送和接收消息

在Spring Boot应用的主类中，注入生产者并发送一条消息：

```java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application implements CommandLineRunner {

    @Autowired
    private Producer producer;

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        producer.sendMessage("messageQueue", "Hello, Redis!");
    }
}
```

运行应用后，控制台将输出接收到的消息：

```
Received message: Hello, Redis!
```