优雅解决 SpringBoot 在 JDK8 中 LocalDateTime (反)序列化问题-蒲公英云

优雅解决 SpringBoot 在 JDK8 中 LocalDateTime (反)序列化问题

Bertha 。 2023-07-05 14:55 112阅读 0赞

在做项目的时候很容易遇到这种问题：

org.springframework.http.converter.HttpMessageNotReadableException:

JSON parse error: Cannot deserialize value of type java.time.LocalDateTime from String \“2020-02-15 22:13:15\“:

Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text ‘2020-02-15 22:13:15’ 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 \“2020-02-15 22:13:15\“: Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text ‘2020-02-15 22:13:15’ could not be parsed at index 10\n at [Source: (PushbackInputStream); line: 1, column: 15]

出现这种问题的原因是项目中使用了 JDK8 中全新的日期和时间类：LocalDateTime。LocalDateTime 默认的时间格式是: yyyy-MM-ddTHHss，中间多了一个 T 字，但是对于往常的数据来说是没有 T 字的，这就会造成后端在接受或返回时间数据的时候出现异常，解决方案如下（添加一个配置类，千万不要忘了 @Configuration 注解）：

import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
/**
 * @author roc
 */
@Configuration
public class LocalDateTimeConfiguration {
    @Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
    private String pattern;
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> {
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            //返回时间数据序列化
            builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer(formatter));
            //接收时间数据反序列化
            builder.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer(formatter));
        };
    }
}