【Redis】redisTemplate序列化配置、解决LocalDateTime数据类型序列化报错问题、解决无法自动装配问题

文章目录

• 文章目录
• 正文
• 一、导入依赖
• 二、创建RedisTemplate的配置类
•         1. 基础配置
•         2. 配置序列化工具，解决LocalDateTime序列化问题
• 三、完整代码
• 四、无法自动装配解决办法

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正文

一、导入依赖

        这里使用jackson依赖，用其他的序列化工具也可

    org.springframework.boot
    spring-boot-starter-data-redis




    com.fasterxml.jackson.core
    jackson-databind

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二、创建RedisTemplate的配置类

        1. 基础配置

@Configuration
public class RedisTemplateConfig {
    
    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        // 创建redisTemplate对象
        RedisTemplate template = new RedisTemplate<>();
        
        // 连接工厂
        template.setConnectionFactory(redisConnectionFactory);
        
        // 获取序列化工具
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        
        
        // 设置key的序列化 (Redis 默认序列化工具)
        template.setKeySerializer(stringRedisSerializer);
        template.setHashKeySerializer(stringRedisSerializer);
        
        // 设置value的序列化 (Jackson 序列化工具)
        template.setValueSerializer(jsonRedisSerializer);
        template.setHashValueSerializer(jsonRedisSerializer);
        
        // 开启事务
        template.setEnableTransactionSupport(true);
        
        return template;
    }
}

         上述配置就可以满足基本需求，但当java实体类含有LocalDateTime数据类型时会报错：org.springframework.data.redis.serializer.SerializationException: Could not write JSON: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module

         因此需要配置序列化工具，使其支持对该数据类型的序列化与反序列化

        2. 配置序列化工具，解决LocalDateTime序列化问题

private GenericJackson2JsonRedisSerializer myJasonRedisSerializer() {
    ObjectMapper objectMapper = new ObjectMapper();

    // 设置可见性
    objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    
    // 序列化后添加类信息(不配置,序列化后就是一个Json字符串)
    objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
    
    // 将日期序列化为可读字符串而不是时间戳
    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    
    //设置时间模块(格式化，不设置，则输出默认格式)
    JavaTimeModule timeModule = new JavaTimeModule();
    // LocalDateTime
    timeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneId.of("Asia/Shanghai"))));
    timeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneId.of("Asia/Shanghai"))));
    // LocalDate
    timeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd").withZone(ZoneId.of("Asia/Shanghai"))));
    timeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd").withZone(ZoneId.of("Asia/Shanghai"))));
    
    // 设置自定义时间模块
    objectMapper.registerModule(timeModule);
    return new GenericJackson2JsonRedisSerializer(objectMapper);
}

        注： 

1.  objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance,ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY); 会在序列化后带上类的信息，便于反序列化。 

2.  解决序列化LocalDateTime数据类型报错: 

        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

        objectMapper.registerModule(new JavaTimeModule());

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三、完整代码

代码如下：

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;

@Configuration
public class RedisTemplateConfig {
    
    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        // 创建redisTemplate对象
        RedisTemplate template = new RedisTemplate<>();
        
        // 连接工厂
        template.setConnectionFactory(redisConnectionFactory);
        
        // 获取序列化工具
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer