Jackson序列化和反序列化的统一配置

JDK17+SpringBoot3.2.2

通过实现 Jackson2ObjectMapperBuilderCustomizer接口重写customize方法，springboot会对该接口的所有实现类进行配置的合并，将设置的属性封装到IOC容器中的ObjectMapper对象中，无需进行手动New。如果自己new ObjectMapper，那么这些自定义的配置就不会自动封装到新创建的objectMapper对象中，需要自己再去为新new出来的对象设置属性。

将下面这个类放入IOC容器即可，无需其他配置，就可以实现想要的序列化和反序列化结果。

JacksonConfig.java

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
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.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.core.Ordered;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.stereotype.Component;

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

@Component
public class JacksonConfig implements Jackson2ObjectMapperBuilderCustomizer, Ordered {

    @Override
    public void customize(Jackson2ObjectMapperBuilder builder) {
        String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
        String DATE_FORMAT = "yyyy-MM-dd";

        builder.serializerByType(Long.class, ToStringSerializer.instance);
        builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
        builder.serializerByType(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DATE_FORMAT)));

        builder.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
        builder.deserializerByType(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DATE_FORMAT)));

        builder.simpleDateFormat(DATE_TIME_FORMAT);
        builder.timeZone("GMT+8");
        builder.serializationInclusion(JsonInclude.Include.ALWAYS);
        builder.visibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    }

    @Override
    public int getOrder() {
        return 1;
    }
}