spring boot基于NoSQL数据库Redis发送接收存储消息

ゝ一世哀愁。 2023-10-01 15:47 31阅读 0赞

spring boot里面利用Redis发送、接收、存储消息很方便。写一个消息接收器：

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.redis.core.StringRedisTemplate;
    
    import java.util.UUID;
    import java.util.concurrent.atomic.AtomicInteger;
    
    public class MsgReceiver {
        @Autowired
        StringRedisTemplate mStringRedisTemplate;
    
        private AtomicInteger counter = new AtomicInteger();
    
        public void receive(String message) {
            System.out.println("收到消息 <" + message + "> " + counter.get());
            
            //将收到的消息存储到Redis数据库中。
            mStringRedisTemplate.opsForValue().set(UUID.randomUUID().toString(), message);
    
            counter.incrementAndGet();
        }
    
        public int getCount() {
            return counter.get();
        }
    }

application里面进行消息的发送：

import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.annotation.Bean;
    import org.springframework.data.redis.connection.RedisConnectionFactory;
    import org.springframework.data.redis.core.StringRedisTemplate;
    import org.springframework.data.redis.listener.PatternTopic;
    import org.springframework.data.redis.listener.RedisMessageListenerContainer;
    import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
    
    @SpringBootApplication
    public class SpringRedisMessageApplication {
        private static final String CHAT_CHANNEL = "聊天";
    
        @Bean
        public RedisMessageListenerContainer container(RedisConnectionFactory factory, MessageListenerAdapter adapter) {
            RedisMessageListenerContainer container = new RedisMessageListenerContainer();
            container.setConnectionFactory(factory);
            container.addMessageListener(adapter, new PatternTopic(CHAT_CHANNEL));
            return container;
        }
    
        @Bean
        public MessageListenerAdapter messageListenerAdapter(MsgReceiver msgReceiver) {
            return new MessageListenerAdapter(msgReceiver, "receive"); //"receive"对应MsgReceiver里面定义的函数名称
        }
    
        @Bean
        public MsgReceiver receiver() {
            return new MsgReceiver();
        }
    
        @Bean
        public StringRedisTemplate template(RedisConnectionFactory factory) {
            return new StringRedisTemplate(factory);
        }
    
        public static void main(String[] args) {
            ApplicationContext ctx = SpringApplication.run(SpringRedisMessageApplication.class, args);
    
            StringRedisTemplate template = ctx.getBean(StringRedisTemplate.class);
            MsgReceiver receiver = ctx.getBean(MsgReceiver.class);
    
            int total = 5;
            while (true) {
                if (receiver.getCount() == total) {
                    System.out.println("已经发送条" + total + "条消息");
                    break;
                }
    
                System.out.println("发送消息...");
                String msg = "[Message]: Hello,world! @" + System.currentTimeMillis();
                template.convertAndSend(CHAT_CHANNEL, msg);
                System.out.println(msg + "发送完毕");
    
                try {
                    Thread.sleep(100);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
    
            System.exit(0);
        }
    }

运行application前，先把Redis服务器启动起来。application跑起来后输出：

发送消息...
    [Message]: Hello,world! @1642649316292发送完毕
    收到消息 <[Message]: Hello,world! @1642649316292> 0
    发送消息...
    [Message]: Hello,world! @1642649316402发送完毕
    收到消息 <[Message]: Hello,world! @1642649316402> 1
    发送消息...
    [Message]: Hello,world! @1642649316504发送完毕
    收到消息 <[Message]: Hello,world! @1642649316504> 2
    发送消息...
    [Message]: Hello,world! @1642649316606发送完毕
    收到消息 <[Message]: Hello,world! @1642649316606> 3
    发送消息...
    [Message]: Hello,world! @1642649316708发送完毕
    收到消息 <[Message]: Hello,world! @1642649316708> 4
    已经发送条5条消息
    
    Process finished with exit code 0

用Redis的GUI数据库管理工具，可以看到消息已经存到数据库里面：

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAemhhbmdwaGls_size_20_color_FFFFFF_t_70_g_se_x_16][]

[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAemhhbmdwaGls_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/0f3fca4622424bc2bbf192275afdaf54.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAemhhbmdwaGls,size_20,color_FFFFFF,t_70,g_se,x_16