Spring boot+redis实现消息发布与订阅

Spring boot+redis实现消息发布与订阅
https://blog.51cto.com/u_13501268/2489571

一．创建spring boot项目

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<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.41</version>
		</dependency>
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二．编辑yml配置文件

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server:
  port: 7888
# 日志配置
logging:
  config: classpath:log/logback.xml
  level:
    cn.com.dhcc: info
    org.springframework: info
    org.springframework.web: info
    com.alibaba.nacos.client.naming: error
spring:
  redis:
     host: localhost
     port: 6379
     password: *********
     database: 1
     jedis:
      pool:
        max-idle: 8
        max-active: 8
        max-wait: -1
        min-idle: 0
     timeout: 5000
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三．配置Redis

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@Configuration
public class RedisConfiguration {
	/**
	 * 实例化 RedisTemplate 对象
	 *
	 * @return
	 */
	@Bean("RedisTemplateS")
	public RedisTemplate<String, Object> functionDomainRedisTemplate(RedisConnectionFactory redisConnectionFactory) {
		RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
		initDomainRedisTemplate(redisTemplate, redisConnectionFactory);
		return redisTemplate;
	}
	/**
	 * 设置数据存入 redis 的序列化方式,并开启事务
	 * 
	 * @param redisTemplate
	 * @param factory
	 */
	private void initDomainRedisTemplate(@Qualifier("RedisTemplateS") RedisTemplate<String, Object> redisTemplate, RedisConnectionFactory factory) {
		// 如果不配置Serializer，那么存储的时候缺省使用String，如果用User类型存储，那么会提示错误User can't cast to
		// String！
		redisTemplate.setKeySerializer(new StringRedisSerializer());
		redisTemplate.setHashKeySerializer(new StringRedisSerializer());	
		FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<Object>(Object.class);
		redisTemplate.setHashValueSerializer(fastJsonRedisSerializer);
		redisTemplate.setValueSerializer(fastJsonRedisSerializer);
		//redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
		//redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
		// 开启事务
		redisTemplate.setEnableTransactionSupport(true);
		redisTemplate.setConnectionFactory(factory);
	}
	/**
	 * 注入封装RedisTemplate @Title: redisUtil @return RedisUtil @date
	 * 
	 */
	@Bean(name = "redisUtils")
	public RedisUtils redisUtil(@Qualifier("RedisTemplateS") RedisTemplate<String, Object> redisTemplate) {
		RedisUtils redisUtil = new RedisUtils();
		redisUtil.setRedisTemplate(redisTemplate);
		return redisUtil;
	}
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四．编写RedisUtil消息发布方法

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public class RedisUtils {
	private static final Logger log = LoggerFactory.getLogger(RedisUtils.class);
	private RedisTemplate<String, Object> redisTemplate;
	public void setRedisTemplate(RedisTemplate<String, Object> redisTemplate) {
		this.redisTemplate = redisTemplate;
	}
	public void publish(String channal ,Object obj) {
		redisTemplate.convertAndSend(channal,obj );
	}
}
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五．配置消息监听

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@Configuration
public class RedisMessageListener {
	/**
     * 创建连接工厂
     * @param connectionFactory
     * @param listenerAdapter
     * @return
     */
    @Bean
    public RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory,
      MessageListenerAdapter listenerAdapter,MessageListenerAdapter listenerAdapter2){
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        //接受消息的key
        container.addMessageListener(listenerAdapter,new PatternTopic("phone"));
        return container;
    }
    /**
     * 绑定消息监听者和接收监听的方法
     * @param receiver
     * @return
     */
    @Bean
    public MessageListenerAdapter listenerAdapter(ReceiverRedisMessage  receiver){
        return new MessageListenerAdapter(receiver,"receiveMessage");
    }
    /**
     * 注册订阅者
     * @param latch
     * @return
     */
    @Bean
    ReceiverRedisMessage receiver(CountDownLatch latch) {
        return new ReceiverRedisMessage(latch);
    }
    /**
     * 计数器，用来控制线程
     * @return
     */
    @Bean
    public CountDownLatch latch(){
        return new CountDownLatch(1);//指定了计数的次数 1
    }
}
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六．消息订阅方法

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public class ReceiverRedisMessage {
	private static final Logger log = LoggerFactory.getLogger(ReceiverRedisMessage.class);
	private CountDownLatch latch;
	@Autowired
	public ReceiverRedisMessage(CountDownLatch latch) {
		this.latch = latch;
	}
	/**
	 * 队列消息接收方法
	 *
	 * @param jsonMsg
	 */
	public void receiveMessage(String jsonMsg) {
		log.info("[开始消费REDIS消息队列phone数据...]");
		try {
			log.info("监听者收到消息：{}", jsonMsg);
			JSONObject exJson = JSONObject.parseObject(jsonMsg);
			User user = JSON.toJavaObject(exJson, User.class);
			System.out.println("转化为对象 ："+user);
			log.info("[消费REDIS消息队列phone数据成功.]");
		} catch (Exception e) {
			log.error("[消费REDIS消息队列phone数据失败，失败信息:{}]", e.getMessage());
		}
		latch.countDown();
	}
}
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七．定时消息发布测试

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@EnableScheduling
@Component
public class PublisherController {
	private static final Logger log = LoggerFactory.getLogger(PublisherController.class);
	@Autowired
	private RedisUtils redisUtils;
	@Scheduled(fixedRate = 5000)
	public String pubMsg() {
		User user=new User(1, "尚***", 26,"男","陕西省xxxx市xxxxxx县");
		redisUtils.publish("phone", user);
		log.info("Publisher sendes Topic... ");
		return "success";
	}
}
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八．测试结果

九．发布对象User实体

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public class User implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private int id;
	private String name;
	private int age;
	private String sex;
	private String address;
     .....................
}
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