JAVA中 redisTemplate 和 jedis的配合使用操作

Z时代
2024-01-10
分类：综合

首先项目A，也就是SpringBOOT项目中使用redisTemplate 来做REDIS的缓存时，你会发现存到REDIS里边的KEY和VALUE，redisTemplat使用jdkSerializeable存储二进制字节编码

项目B中使用jedis时，存储起来的是字符串，导致项目A要调用项目缓存的键值对时，获取不到

解决方案：

修改项目A的redisTemplate的序列方式


@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
  /**
   * redis模板，存储关键字是字符串，值是Jdk序列化
   * @param factory
   * @return
   * @Description:
   */
  @Bean
  public RedisTemplate<?, ?> redisTemplate(RedisConnectionFactory factory) {
    RedisTemplate<?, ?> redisTemplate = new RedisTemplate<>();
    redisTemplate.setConnectionFactory(factory);
    //key序列化方式;但是如果方法上有Long等非String类型的话，会报类型转换错误；
    RedisSerializer<String> redisSerializer = new StringRedisSerializer();//Long类型不可以会出现异常信息;
    redisTemplate.setKeySerializer(redisSerializer);
    redisTemplate.setHashKeySerializer(redisSerializer);
    //默认使用JdkSerializationRedisSerializer序列化方式;会出现乱码，改成StringRedisSerializer
    StringRedisSerializer stringSerializer = new StringRedisSerializer();
    redisTemplate.setKeySerializer(stringSerializer);
    redisTemplate.setValueSerializer(stringSerializer);
    redisTemplate.setHashKeySerializer(stringSerializer);
    redisTemplate.setHashValueSerializer(stringSerializer);
    return redisTemplate;
  }
}

补充：RedisTemplate初始化和创建(非Spring注入方式)

概述

在工作中, 可能会在非Spring项目(如Spark,Flink作业)中去操作Redis, 重复造轮子去写工具类没有太大的意义, 使用RedisTemplate已经足够丰富和完善了,使用New的方式进行创建即可, 不同的spring-data-redis的版本会略有不同, 下面以2.3.0和1.8.9做为示例.

2.3.0

maven


<dependency>
  <groupId>org.springframework.data</groupId>
  <artifactId>spring-data-redis</artifactId>
  <version>2.3.0.RELEASE</version>
</dependency>
<dependency>
  <groupId>redis.clients</groupId>
  <artifactId>jedis</artifactId>
  <version>3.3.0</version>
</dependency>

代码


import org.springframework.data.redis.connection.RedisClusterConfiguration;
import org.springframework.data.redis.connection.RedisNode;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
public class RedisTest {
  public static void main(String[] args) {
    //单机模式
    RedisStandaloneConfiguration rsc = new RedisStandaloneConfiguration();
    rsc.setPort(6379);
    rsc.setPassword("123456");
    rsc.setHostName("192.168.1.1");
    //集群模式
    RedisClusterConfiguration rcc = new RedisClusterConfiguration();
    rcc.setPassword("123456");
    List<RedisNode> nodes = Collections.singletonList(new RedisNode("192.168.1.1", 6379));
    rcc.setClusterNodes(nodes);
    RedisTemplate<String, String> template = new RedisTemplate<>();
    //单机模式
    JedisConnectionFactory fac = new JedisConnectionFactory(rsc);
    //集群模式
    //JedisConnectionFactory fac = new JedisConnectionFactory(rcc);
    fac.afterPropertiesSet();
    template.setConnectionFactory(fac);
    template.setDefaultSerializer(new StringRedisSerializer());
    template.afterPropertiesSet();
    ValueOperations<String, String> op = template.opsForValue();
    final String key = "123_tmp";
    final String value = "abc";
    template.delete(key);
    op.set(key, value);
    assert Objects.equals(op.get(key), value);
  }
}

集群方式运行报错

Exception in thread "main" redis.clients.jedis.exceptions.JedisDataException: ERR This instance has cluster support disabled

解决

在redis.conf下将cluster-enabled改为yes

如果只有一个节点, 改为单机模式

1.8.9

maven


<dependency>
  <groupId>org.springframework.data</groupId>
  <artifactId>spring-data-redis</artifactId>
  <version>1.8.9.RELEASE</version>
</dependency>
<dependency>
  <groupId>redis.clients</groupId>
  <artifactId>jedis</artifactId>
  <version>2.9.0</version>
</dependency>

代码


import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.JedisShardInfo;
import java.util.Objects;
public class RedisTest {
  public static void main(String[] args) {
    RedisTemplate<String, String> template = new RedisTemplate<>();
    JedisConnectionFactory fac = new JedisConnectionFactory(new JedisPoolConfig());
    JedisShardInfo shardInfo = new JedisShardInfo("192.168.1.1", 6379);
    shardInfo.setPassword("123456");
    fac.setShardInfo(shardInfo);
    template.setConnectionFactory(fac);
    template.setDefaultSerializer(new StringRedisSerializer());
    template.afterPropertiesSet();
    ValueOperations<String, String> op = template.opsForValue();
    final String key = "123_tmp";
    final String value = "abc";
    template.delete(key);
    op.set(key, value);
    assert Objects.equals(op.get(key), value);
  }
}

这里有个小细节, 如果不调用setShardInfo()方法, 那么需要执行下面的代码, afterPropertiesSet()用来初始化


JedisConnectionFactory fac = new JedisConnectionFactory(new JedisPoolConfig());
    fac.setPort(6379);
    fac.setPassword("123456");
    fac.setHostName("192.168.1.1");
    fac.afterPropertiesSet();