Spring boot caching with redis,key have \xac\xed\x

Question

I want to use Spring cache @Cacheable to manager cache. And the real cache is redis.

my code like that:

@PostMapping("/post")
@CachePut(value = "abc", key = "#key")
public String putInRedis(@RequestParam String key, @RequestParam String value) {
    saveInDB(key, value);

    return value;
}

@GetMapping("/get")
@Cacheable(value = "abc", key = "#key")
public String queryRedis(@RequestParam String key) {

    return findByKey(key);
}

After I have the post request which is

localhost:8080/post?key=key&value=value

the redis server appear a weird key

127.0.0.1:6379> keys *
1) "abc:\xac\xed\x00\x05t\x00\x03key"
127.0.0.1:6379> GET "abc:\xac\xed\x00\x05t\x00\x03key"
"\xac\xed\x00\x05t\x00\x05value"

Spring caching

weird-redis-key-with-spring-data-jedis

how to set @Cacheable's Serializer like StringRedisTemplate default：

public StringRedisTemplate() {
    RedisSerializer<String> stringSerializer = new StringRedisSerializer();
    setKeySerializer(stringSerializer);
    setValueSerializer(stringSerializer);
    setHashKeySerializer(stringSerializer);
    setHashValueSerializer(stringSerializer);
}

my application.properties:

spring.redis.host=localhost
spring.redis.password=
spring.redis.port=6379

build.gradle

group 'io.freezhan'
version '1.0-SNAPSHOT'

buildscript {
    repositories {
        maven {
            url 'https://plugins.gradle.org/m2/'
        }
    }
    dependencies {
        classpath 'org.springframework.boot:spring-boot-gradle-plugin:1.4.0.RELEASE'
    }
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.13'
    distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
}

apply plugin: 'java'
apply plugin: 'spring-boot'

sourceCompatibility = 1.5

repositories {
    mavenCentral()
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web") {
        exclude module: "spring-boot-starter-tomcat"
    }
    compile("org.springframework.boot:spring-boot-starter-data-redis")
    compile("org.springframework.boot:spring-boot-starter-jetty")
    compile("org.springframework.boot:spring-boot-starter-actuator")
    compile 'org.projectlombok:lombok:1.16.10'
    testCompile("junit:junit")
}

Answer 1

like mm759's answer:

1. Define the RedisCacheManager as bean on your own.

   2. Pass the RedisTemplate to the constructor of RedisCacheManager.

this code will solve my problem:

package io;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.CacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * Created by freezhan on 16/9/5.
 */
@Configuration
public class CacheConfig {

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Bean
    public CacheManager cacheManager() {
        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
        return cacheManager;
    }

}

and the redis store like this:

Answer 2

Create a redis template

private RedisTemplate<String, ?> createRedisTemplateForEntity() {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
        redisTemplate.setConnectionFactory(getRedisConnectionFactory());
        redisTemplate.setHashValueSerializer(new StringRedisSerializer());
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.afterPropertiesSet();

    return redisTemplate;
}

Why is it creation a weird key ?

The key is created based on the argument attributes present in your method which is annotated as cacheable. This is how spring reads the cache value from redis.

Answer 3

The caching - feature of Spring allows to use different cache - implementations. One of them is Redis. It can be used with the class RedisCacheManager. The Spring documentation says:

If Redis is available and configured, the RedisCacheManager is auto-configured.

This is the approach that I propose to influence the Redis - caching - integration:

1. Define the RedisCacheManager as bean on your own.

2. Pass the RedisTemplate to the constructor of RedisCacheManager.

I found an example for this on the Internet using a programmmatic configuration. There is also an example using XML-based configuration.