Spring boot+redis实现消息发布与订阅

Posted 2021-02-27

一．创建spring boot项目

<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>

二．编辑yml配置文件

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

三．配置Redis

@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;
    }

四．编写RedisUtil消息发布方法

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 );
    }
}

五．配置消息监听

@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
    }
}

六．消息订阅方法

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();
    }
}

七．定时消息发布测试

@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";
    }
}

八．测试结果

九．发布对象User实体

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;
     .....................
}