错误：io.莴苣.core,RedConnectionException无法连接到本地主机/＜未解析＞

hmtdttj4  于 2022-09-19  发布在  Spring
关注(0)|答案(1)|浏览(131)

我正在从一本书中尝试这个教程，其中有一个api正在运行，当使用redis代码的应用程序被调用时，它应该从api输出信息。然而，这是我运行应用程序时遇到的错误：

  1. org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to localhost/<unresolved>:6379
  2.     at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactory.java:1689) ~[spring-data-redis-2.6.3.jar:2.6.3]
  3.     at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.java:1597) ~[spring-data-redis-2.6.3.jar:2.6.3]
  4.     at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getNativeConnection(LettuceConnectionFactory.java:1383) ~[spring-data-redis-2.6.3.jar:2.6.3]
  5.     at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getConnection(LettuceConnectionFactory.java:1366) ~[spring-data-redis-2.6.3.jar:2.6.3]
  6.     at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getSharedConnection(LettuceConnectionFactory.java:1093) ~[spring-data-redis-2.6.3.jar:2.6.3]
  7.     at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getConnection(LettuceConnectionFactory.java:421) ~[spring-data-redis-2.6.3.jar:2.6.3]
  8.     at com.demo.springdataexample.demo.PlaneFinderPoller.pollPlanes(PlaneFinderPoller.java:25) ~[classes/:na]
  9.     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
  10.     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
  11.     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
  12.     at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
  13.     at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84) ~[spring-context-5.3.18.jar:5.3.18]
  14.     at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-5.3.18.jar:5.3.18]
  15.     at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[na:na]
  16.     at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) ~[na:na]
  17.     at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305) ~[na:na]
  18.     at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[na:na]
  19.     at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[na:na]
  20.     at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
  21. Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to localhost/<unresolved>:6379
  22.     at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:78) ~[lettuce-core-6.1.8.RELEASE.jar:6.1.8.RELEASE]
  23.     at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56) ~[lettuce-core-6.1.8.RELEASE.jar:6.1.8.RELEASE]
  24.     at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:330) ~[lettuce-core-6.1.8.RELEASE.jar:6.1.8.RELEASE]
  25.     at io.lettuce.core.RedisClient.connect(RedisClient.java:216) ~[lettuce-core-6.1.8.RELEASE.jar:6.1.8.RELEASE]
  26.     at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:115) ~[spring-data-redis-2.6.3.jar:2.6.3]
  27.     at java.base/java.util.Optional.orElseGet(Optional.java:364) ~[na:na]
  28.     at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:115) ~[spring-data-redis-2.6.3.jar:2.6.3]
  29.     at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.java:1595) ~[spring-data-redis-2.6.3.jar:2.6.3]
  30.     ... 17 common frames omitted

以下是代码：
主要类别：

  1. package com.demo.springdataexample.demo;
  3. import org.springframework.boot.SpringApplication;
  4. import org.springframework.boot.autoconfigure.SpringBootApplication;
  5. import org.springframework.context.annotation.Bean;
  6. import org.springframework.data.redis.connection.RedisConnectionFactory;
  7. import org.springframework.data.redis.core.RedisOperations;
  8. import org.springframework.data.redis.core.RedisTemplate;
  9. import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
  10. import org.springframework.data.redis.serializer.StringRedisSerializer;
  12. @SpringBootApplication
  13. public class SburRedisApplication {
  14.     @Bean
  15.     public RedisOperations<String, Aircraft>
  16.     redisOperations(RedisConnectionFactory factory) {
  17.         Jackson2JsonRedisSerializer<Aircraft> serializer =
  18.                 new Jackson2JsonRedisSerializer<>(Aircraft.class);
  20.         RedisTemplate<String, Aircraft> template = new RedisTemplate<>();
  21.         template.setConnectionFactory(factory);
  22.         template.setDefaultSerializer(serializer);
  23.         template.setKeySerializer(new StringRedisSerializer());
  25.         return template;
  26.     }
  28.     public static void main(String[] args) {
  29.         SpringApplication.run(SburRedisApplication.class, args);
  30.     }
  31. }

PlaneFinderPoller.java

  1. package com.demo.springdataexample.demo;
  3. import org.springframework.data.redis.connection.RedisConnectionFactory;
  4. import org.springframework.data.redis.core.RedisOperations;
  5. import org.springframework.scheduling.annotation.EnableScheduling;
  6. import org.springframework.scheduling.annotation.Scheduled;
  7. import org.springframework.stereotype.Component;
  8. import org.springframework.web.reactive.function.client.WebClient;
  10. @EnableScheduling
  11. @Component
  12. public class PlaneFinderPoller {
  13.     private WebClient webclient =
  14.             WebClient.create("http://localhost:7634/aircraft");
  16.     private final RedisConnectionFactory connectionFactory;
  17.     private final RedisOperations<String, Aircraft> redisOperations;
  19.     public PlaneFinderPoller(RedisConnectionFactory connectionFactory,
  20.                              RedisOperations<String, Aircraft> redisOperations)
  21.     {
  22.         this.connectionFactory = connectionFactory;
  23.         this.redisOperations = redisOperations;
  24.     }
  26.     @Scheduled(fixedRate =  1000)
  27.     private  void pollPlanes(){
  28.         connectionFactory.getConnection().serverCommands().flushDb();
  30.         webclient.get()
  31.                 .retrieve()
  32.                 .bodyToFlux(Aircraft.class)
  33.                 .filter(plane -> !plane.getReg().isEmpty())
  34.                 .toStream()
  35.                 .forEach(ac -> redisOperations.opsForValue().set(ac.getReg(), ac));
  37.         redisOperations.opsForValue()
  38.                 .getOperations()
  39.                 .keys("*")
  40.                 .forEach(ac -> System.out.println(redisOperations.opsForValue().get(ac)));
  41.     }
  42. }

Aircraft.java

spring-boot
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