背景：实体类日期字段使用LocalDateTime，使用Postman测试时传入 xxxx-xx-xx 00:00:00 报错

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize value of type java.time.LocalDateTime from String “2021-12-01 00:00:00”: Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text ‘2021-12-01 00:00:00’ could not be parsed at index 10; nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type java.time.LocalDateTime from String “2021-12-01 00:00:00”: Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text ‘2021-12-01 00:00:00’ could not be parsed at index 10\n at [Source: (PushbackInputStream); line: 1, column: 87] (through reference chain: cn.shuchuang.birdev.system.entity.Activity[“startTime”])

方案一：实体类字段格式化日期

每个实体类的日期字段都要格式化一次，配置灵活，但重复工作量大。

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

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

方案二：增加日期转换配置类

一次配置全局生效，但原日期格式 2021-12-16T09:31:08.923Z 将不再生效，且会报错。

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);
        };
    }
}