Spring boot+redis实现消息发布与订阅的代码

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

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原文链接：https://www.cnblogs.com/aiaitie/archive/2020/04/25/12772176.html