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一.BUG 描述
1.现象
com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type
java.util.Datefrom String "2023-11-30 22:31:23": not a valid representation (error: Failed to parse Date value '2023-11-30 22:31:23': Cannot parse date "2023-11-30 22:31:23": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSSX', parsing fails (leniency? null))at [Source: (StringReader); line: 1, column: 634] (through reference chain: com.kwan.springbootkwan.entity.csdn.BusinessInfoResponse["data"]->com.kwan.springbootkwan.entity.csdn.BusinessInfoResponse A r t i c l e D a t a [ " l i s t " ] − > j a v a . u t i l . A r r a y L i s t [ 0 ] − > c o m . k w a n . s p r i n g b o o t k w a n . e n t i t y . c s d n . B u s i n e s s I n f o R e s p o n s e ArticleData["list"]->java.util.ArrayList[0]->com.kwan.springbootkwan.entity.csdn.BusinessInfoResponse ArticleData["list"]−>java.util.ArrayList[0]−>com.kwan.springbootkwan.entity.csdn.BusinessInfoResponseArticleData$Article["postTime"])
at com.fasterxml.jackson.databind.exc.InvalidFormatException.from(InvalidFormatException.java:67)
2.原因
实体类是 Date 类型,但是 json 字符串是 yyyy-MM-dd'T'HH:mm:ss.SSSX 的时间字段,时间格式不匹配导致,json 字符串转实体类失败了。
二.解决方案
1.添加依赖
xml
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.8.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.8</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>2.添加注解
添加@JsonFormat 注解,指定时间格式为 yyyy-MM-dd HH:mm:ss 就不会报错了,
apl
@TableField(value = "postTime")
@ApiModelProperty(value = "时间")
@JsonFormat(locale = "zh", timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
public Date postTime;三.全局配置
1.@JsonComponent
@JsonFormat 注解并不能完全做到全局时间格式化，使用 @JsonComponent 注解自定义一个全局格式化类，分别对 Date 和 LocalDate 类型做格式化处理。
java
@JsonComponent
public class DateFormatConfig {
@Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
private String pattern;
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilder() {
return builder -> {
TimeZone tz = TimeZone.getTimeZone("UTC");
DateFormat df = new SimpleDateFormat(pattern);
df.setTimeZone(tz);
builder.failOnEmptyBeans(false)
.failOnUnknownProperties(false)
.featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
.dateFormat(df);
};
}
@Bean
public LocalDateTimeSerializer localDateTimeDeserializer() {
return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(pattern));
}
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
return builder -> builder.serializerByType(LocalDateTime.class, localDateTimeDeserializer());
}
}2.自定义
但还有个问题，实际开发中如果我有个字段不想用全局格式化设置的时间样式,那该怎么处理呢?
java
@Data
public class OrderDTO {
@JsonFormat(locale = "zh", timezone = "GMT+8", pattern = "yyyy-MM-dd")
private LocalDateTime createTime;
@JsonFormat(locale = "zh", timezone = "GMT+8", pattern = "yyyy-MM-dd")
private Date updateTime;
}@JsonFormat注解的优先级比较高，会以@JsonFormat注解的时间格式为主。
3.@Configuration
注意 ：在使用此种配置后，字段手动配置
@JsonFormat注解将不再生效。
java
@Configuration
public class DateFormatConfig2 {
@Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
private String pattern;
public static DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
@Bean
@Primary
public ObjectMapper serializingObjectMapper() {
ObjectMapper objectMapper = new ObjectMapper();
JavaTimeModule javaTimeModule = new JavaTimeModule();
javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer());
javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer());
objectMapper.registerModule(javaTimeModule);
return objectMapper;
}
@Component
public class DateSerializer extends JsonSerializer<Date> {
@Override
public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException {
String formattedDate = dateFormat.format(date);
gen.writeString(formattedDate);
}
}
@Component
public class DateDeserializer extends JsonDeserializer<Date> {
@Override
public Date deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
try {
return dateFormat.parse(jsonParser.getValueAsString());
} catch (ParseException e) {
throw new RuntimeException("Could not parse date", e);
}
}
}
public class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
@Override
public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
gen.writeString(value.format(DateTimeFormatter.ofPattern(pattern)));
}
}
public class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
@Override
public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext) throws IOException {
return LocalDateTime.parse(p.getValueAsString(), DateTimeFormatter.ofPattern(pattern));
}
}
}觉得有用的话点个赞
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