1. 后端可用String接收，再转LocalDateTime
   特点：适用于此类型参数较少的场景
2. 前端传"2021-05-16T12:10:10"类型，后端借助注解，使用LocalDateTime接收
   特点：前端传参麻烦

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private LocalDateTime time;

3. 前端传"2021-05-16 12:10:10"类型，后端借助配置类，使用LocalDateTime接收
4. 结论：推荐第三种方案实现前端传String类型，后端转LocalDateTime

import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.converter.Converter;

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

@Configuration
public class LocalDateTimeSerializerConfig {

    private static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
    private static final String DATE_PATTERN = "yyyy-MM-dd";

    /**
     * string转localdate
     */
    @Bean
    public Converter<String, LocalDate> localDateConverter() {
        return new Converter<String, LocalDate>() {
            @Override
            public LocalDate convert(String source) {
                if (source.trim().length() == 0) {
                    return null;
                }
                try {
                    return LocalDate.parse(source);
                } catch (Exception e) {
                    return LocalDate.parse(source, DateTimeFormatter.ofPattern(DATE_PATTERN));
                }
            }
        };
    }

    /**
     * string转localdatetime
     */
    @Bean
    public Converter<String, LocalDateTime> localDateTimeConverter() {
        return new Converter<String, LocalDateTime>() {
            @Override
            public LocalDateTime convert(String source) {
                if (source.trim().length() == 0) {
                    return null;
                }
                // 先尝试ISO格式: 2019-07-15T16:00:00
                try {
                    return LocalDateTime.parse(source);
                } catch (Exception e) {
                    return LocalDateTime.parse(source, DateTimeFormatter.ofPattern(DATE_TIME_PATTERN));
                }
            }
        };
    }

    /**
     * 统一配置
     */
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jsonCustomizer() {
        JavaTimeModule module = new JavaTimeModule();
        LocalDateTimeDeserializer localDateTimeDeserializer = new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        module.addDeserializer(LocalDateTime.class, localDateTimeDeserializer);
        return builder -> {
            builder.simpleDateFormat(DATE_TIME_PATTERN);
            builder.serializers(new LocalDateSerializer(DateTimeFormatter.ofPattern(DATE_PATTERN)));
            builder.serializers(new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DATE_TIME_PATTERN)));
            builder.modules(module);
        };
    }
}