JDK8 - LocalDateTime（反）序列化異常

異常信息

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize value of type `java.time.LocalDateTime` from String "2021-05-25 11:02:00": Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text '2021-05-25 11:02:00' 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 "2021-05-25 11:02:00": Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text '2021-05-25 11:02:00' could not be parsed at index 10......

原因

• JDK8中LocalDateTime默認日期格式是"yyy-MM-ddTHH:mm:ss"，相對於往常數據格式多了"T"，造成接收或者返回時間數據格式的時候出現異常

解決1：

• 配置全局日期格式化

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 org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

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

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @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);
            //返回時間數據序列化
            builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer(formatter));
            //接收時間數據反序列化
            builder.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer(formatter));
        };
    }
}

解決2:

• 在LocalDateTime 實體類使用注解

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