JAVA中 redisTemplate 和 jedis的配合使用操作

首先項目A,也就是SpringBOOT項目中使用redisTemplate 來做REDIS的緩存時,你會發現存到REDIS裡邊的KEY和VALUE,redisTemplat使用jdkSerializeable存儲二進制字節編碼

項目B中使用jedis時,存儲起來的是字符串,導致項目A要調用項目緩存的鍵值對時,獲取不到

解決方案:

修改項目A的redisTemplate的序列方式

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
  
  /**
   * redis模板,存儲關鍵字是字符串,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類型的話,會報類型轉換錯誤;
    RedisSerializer<String> redisSerializer = new StringRedisSerializer();//Long類型不可以會出現異常信息;
    redisTemplate.setKeySerializer(redisSerializer);
    redisTemplate.setHashKeySerializer(redisSerializer);
    //默認使用JdkSerializationRedisSerializer序列化方式;會出現亂碼,改成StringRedisSerializer
    StringRedisSerializer stringSerializer = new StringRedisSerializer();
    redisTemplate.setKeySerializer(stringSerializer);
    redisTemplate.setValueSerializer(stringSerializer);
    redisTemplate.setHashKeySerializer(stringSerializer);
    redisTemplate.setHashValueSerializer(stringSerializer);
    return redisTemplate;
  }
}

補充:RedisTemplate初始化和創建(非Spring註入方式)

概述

在工作中, 可能會在非Spring項目(如Spark,Flink作業)中去操作Redis, 重復造輪子去寫工具類沒有太大的意義, 使用RedisTemplate已經足夠豐富和完善瞭,使用New的方式進行創建即可, 不同的spring-data-redis的版本會略有不同, 下面以2.3.0和1.8.9做為示例.

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>

代碼

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) {
    //單機模式
    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<>();
    //單機模式
    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);
  }
}

集群方式運行報錯

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

解決

在redis.conf下將cluster-enabled改為yes

如果隻有一個節點, 改為單機模式

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>

代碼

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);
  }
}

這裡有個小細節, 如果不調用setShardInfo()方法, 那麼需要執行下面的代碼, afterPropertiesSet()用來初始化

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

說明

RedisTemplate的構造方法有多種, 上面所舉例子為其中的一種; 不通過SpringBoot自動裝配的方式, 必須手動去執行afterPropertiesSet()進行初始化; 可參考SpringBoot整合redis的方式, 查看對應實現

以上為個人經驗,希望能給大傢一個參考,也希望大傢多多支持WalkonNet。如有錯誤或未考慮完全的地方,望不吝賜教。