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redis初學(xué)者常見(jiàn)字符亂碼問(wèn)題及解決方案

更新時(shí)間：2023年09月07日 09:27:49 作者：太空眼睛

這篇文章主要介紹了redis初學(xué)者常見(jiàn)字符亂碼問(wèn)題及解決方案,具有很好的參考價(jià)值,希望對(duì)大家有所幫助,如有錯(cuò)誤或未考慮完全的地方,望不吝賜教

本文開(kāi)發(fā)環(huán)境介紹

開(kāi)發(fā)依賴(lài)	版本
Spring Boot	2.6.6

pom.xml依賴(lài)

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
    </dependency>
</dependencies>

redis保存數(shù)據(jù)后出現(xiàn)\xac\xed\x00\x05t\x00的問(wèn)題

測(cè)試代碼

public class RedisTemplateTest extends DemoRedisTestBase {
    @SneakyThrows
    @Test
    void testSet() {
        String key = String.join(":", "user", RandomStringUtils.randomAlphabetic(10));
        Map<String, String> value = new HashMap<>();
        value.put("id", RandomStringUtils.randomAlphabetic(10));
        value.put("name", RandomStringUtils.randomAlphabetic(10));
        redisTemplate.opsForValue().set(key, objectMapper.writeValueAsString(value));
    }
}

查看寫(xiě)入redis的數(shù)據(jù)

127.0.0.1:6379> keys *user*
1) "\xac\xed\x00\x05t\x00\x0fuser:mnaurYPzBt"

這是因?yàn)槟J(rèn)把key和value的值序列化成**byte[]**格式。

解決辦法

@Configuration
public class RedisTemplateBeanPostProcessor implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        if(RedisTemplate.class.isAssignableFrom(bean.getClass())) {
            RedisTemplate redisTemplate = (RedisTemplate)bean;
            StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
            redisTemplate.setKeySerializer(stringRedisSerializer);
            redisTemplate.setValueSerializer(stringRedisSerializer);
        }
        return bean;
    }
}

再次運(yùn)行測(cè)試代碼，結(jié)果如下

127.0.0.1:6379> keys *user*
1) "user:PvwBNJFUKn"
2) "\xac\xed\x00\x05t\x00\x0fuser:mnaurYPzBt"
127.0.0.1:6379> get user:PvwBNJFUKn
"{\"name\":\"mfEESamnux\",\"id\":\"OFPcKTgwAm\"}"

寫(xiě)一個(gè)帶有效期的數(shù)據(jù)

public class RedisTemplateTest extends DemoRedisTestBase {
    @SneakyThrows
    @Test
    void testSet() {
        String key = String.join(":", "user", RandomStringUtils.randomAlphabetic(10));
        Map<String, String> value = new HashMap<>();
        value.put("id", RandomStringUtils.randomAlphabetic(10));
        value.put("name", RandomStringUtils.randomAlphabetic(10));
        redisTemplate.opsForValue().set(key, objectMapper.writeValueAsString(value), 1L);
        String json = redisTemplate.opsForValue().get(key);
        System.out.println(json);
    }
}

指定了第3個(gè)參數(shù) 1L ，運(yùn)行查看數(shù)據(jù)

在這里插入圖片描述

發(fā)現(xiàn)沒(méi)有，寫(xiě)入redis的數(shù)據(jù)最前面有一個(gè)不認(rèn)識(shí)的字符 \x00 ，其實(shí)是想當(dāng)然的用錯(cuò)了方法，正確設(shè)置過(guò)期時(shí)間的姿勢(shì)應(yīng)該是這樣

public class RedisTemplateTest extends DemoRedisTestBase {
    @SneakyThrows
    @Test
    void testSet() {
        String key = String.join(":", "user", RandomStringUtils.randomAlphabetic(10));
        Map<String, String> value = new HashMap<>();
        value.put("id", RandomStringUtils.randomAlphabetic(10));
        value.put("name", RandomStringUtils.randomAlphabetic(10));
        redisTemplate.opsForValue().set(key, objectMapper.writeValueAsString(value), 1L, TimeUnit.DAYS);
        String json = redisTemplate.opsForValue().get(key);
        System.out.println(json);
    }
}

應(yīng)該使用這個(gè)4個(gè)參數(shù)的方法才是設(shè)置過(guò)期時(shí)間，再運(yùn)行下

在這里插入圖片描述