定制RedisTemplate对象

        对于系统默认的RedisTemplate默认采用的是JDK的序列化机制，假如我们不希望实用JDK的序列化，可以采用的定制RedisTemplate，并采用自己指定的的序列化方式，例如：

package com.jt.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
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.RedisSerializer;

import java.net.UnknownHostException;

@Configuration
public class RedisConfig {
    //自定义json序列化
    public RedisSerializer jsonSerializer(){
        //1.定义Redis序列化,反序列化规范对象(此对象底层通过ObjectMapper完成对象序列化和反序列化)
        Jackson2JsonRedisSerializer serializer=
                new Jackson2JsonRedisSerializer(Object.class);
        //2.创建ObjectMapper(有jackson api库提供)对象,基于此对象进行序列化和反序列化
        //2.1创建ObjectMapper对象
        ObjectMapper objectMapper=new ObjectMapper();
        //2.2设置按哪些方法规则进行序列化
        objectMapper.setVisibility(PropertyAccessor.GETTER,//get方法
                JsonAutoDetect.Visibility.ANY);//Any 表示任意方法访问修饰符
        //对象属性值为null的时候不进行序列化存储
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        //2.2激活序列化类型存储,对象序列化时还会将对象的类型存储到redis数据库
        //假如没有这个配置,redis存储数据时不存储类型,反序列化时会默认将其数据存储到map
        objectMapper.activateDefaultTyping(
                objectMapper.getPolymorphicTypevalidator(),
                ObjectMapper.DefaultTyping.NON_FINAL,//激活序列化类型存储
                JsonTypeInfo.As.PROPERTY);//PROPERTY 表示类型会以json对象的形式存储
        serializer.setObjectMapper(objectMapper);
        return serializer;
    }
    @Bean
    public RedisTemplate redisTemplate(
            RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        //设置key的序列化方式
        template.setKeySerializer(RedisSerializer.string());
        template.setHashKeySerializer(RedisSerializer.string());
        //设置值的序列化方式
        template.setValueSerializer(jsonSerializer());
        template.setHashValueSerializer(jsonSerializer());
        //更新一下redisTemplate默认配置
        template.afterPropertiesSet();
        return template;
    }

    //简单定制
//    @Bean
//    public RedisTemplate redisTemplate(
//            RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
//        RedisTemplate template = new RedisTemplate();
//        template.setConnectionFactory(redisConnectionFactory);
//        //设置key的序列化方式
//        template.setKeySerializer(RedisSerializer.string());
//        template.setHashKeySerializer(RedisSerializer.string());
//        //设置值的序列化方式
//        template.setValueSerializer(RedisSerializer.json());
//        template.setHashValueSerializer(RedisSerializer.json());
//        return template;
//    }

}

 创建Blog对象,然后基于RedisTemplate进行序列化实践,Blog代码如下：

package com.jt.pojo;

import java.io.Serializable;

public class Blog  implements Serializable {
    private static final long serialVersionUID = -5619615150594284572L;
    private Long id;
    private String name;

    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Blog{" +
                "id=" + id +
                ", title='" + name + ''' +
                '}';
    }
}

在RedisTemplateTests类中添加如下单元测试方法,进行测试,例如:

    
    @Test
    void test02(){
//        redisTemplate.setKeySerializer(RedisSerializer.string());
//        redisTemplate.setValueSerializer(RedisSerializer.json());
        //获取blog操作对象
        ValueOperations ops = redisTemplate.opsForValue();
        //2.执行Blog对象读写操作
        Blog blog = new Blog();
        blog.setId(10L);
        blog.setName("redis01");
        ops.set("blog",blog);
        blog = (Blog) ops.get("blog");//反序列化
        System.out.println(blog);
    }