英文:
Formatter<LocalDateTime> not getting registered with Spring Boot container in REST application
问题
我在一个REST Spring Boot Web服务应用中实现了一个Formatter<LocalDateTime>，用于格式化所有LocalDateTime（Java 8）属性，以便在Web服务响应中以特定格式显示。
public class LocalDateTimeFormatter implements Formatter<LocalDateTime> {
@Override
public String print(LocalDateTime temporal, Locale locale) {
DateTimeFormatter formatter = DateTimeFormatter
.ofPattern("yyyy-MM-dd HH:mm:ss");
return formatter.format(temporal);
}
@Override
public LocalDateTime parse(String text, Locale locale)
throws ParseException {
return LocalDateTime.parse(text);
}
}
该格式化程序还已在下面的代码中注册，以便在应用程序级别上运行，以避免单独对所有LocalDateTime属性进行注释。
@Configuration
public class ContentFormatter implements WebMvcConfigurer {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addFormatter(new LocalDateTimeFormatter());
}
}
但是，从Web服务的响应中未应用任何格式化，accessDate是LocalDateTime类型的属性。
{
"content" : "Hello, World!",
"id" : 0,
"accessDate" : "2020-04-07T19:56:41.48"
}
英文:
I have implemented a Formatter<LocalDateTime> in a REST Spring Boot web service application to format all LocalDateTime (Java 8) attributes so that they get displayed in a specific format in the web service response.
public class LocalDateTimeFormatter implements Formatter<LocalDateTime> {
@Override
public String print(LocalDateTime temporal, Locale locale) {
DateTimeFormatter formatter = DateTimeFormatter
.ofPattern("yyyy-MM-dd HH:mm:ss");
return formatter.format(temporal);
}
@Override
public LocalDateTime parse(String text, Locale locale)
throws ParseException {
return LocalDateTime.parse(text);
}
}
The formatter has also been registered as shown below so that it works at the application level in order to avoid annotating all LocalDateTime attributes individually
@Configuration
public class ContentFormatter implements WebMvcConfigurer {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addFormatter(new LocalDateTimeFormatter());
}
}
But no formatting is applied to the response from the web service, accessDate being the LocalDateTime type of attribute
{
"content" : "Hello, World!",
"id" : 0,
"accessDate" : "2020-04-07T19:56:41.48"
}
答案1
得分: 0
你可能甚至不需要实现你的格式化并注册它。只需按以下方式注释您的LocalDateTime属性：
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss")
public LocalDateTime getTime() {
return time;
}
此外，您可能需要添加以下依赖项：
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>2.6.0</version>
</dependency>
有关详细信息，请参阅此问题及其答案：
Spring Data JPA - ZonedDateTime格式化用于JSON序列化
英文:
You probably don't even need to implement your formatted and register it. Just annotate your LocalDateTime property as follows:
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss")
public LocalDateTime getTime() {
return time;
}
Also, you might need to add the following dependency:
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>2.6.0</version>
</dependency>
See this question and its answer for details:
Spring Data JPA - ZonedDateTime format for json serialization
答案2
得分: 0
你可以使用 StdSerializer
public class JacksonLocalDateSerializer extends StdSerializer<LocalDate> {
private static final long serialVersionUID = -7880057299936771237L;
private static final DateTimeFormatter formatter =
DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
.withResolverStyle(ResolverStyle.STRICT);
public JacksonLocalDateSerializer() {
this(null);
}
public JacksonLocalDateSerializer(Class<LocalDate> type) {
super(type);
}
@Override
public void serialize(LocalDate value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
jsonGenerator.writeString(formatter.format(value));
}
}
然后为整个应用程序添加序列化器的配置
@Configuration
public class JacksonConfig {
@Bean
@Primary
public ObjectMapper configureObjectMapper() {
JavaTimeModule javaTimeModule = new JavaTimeModule();
javaTimeModule.addSerializer(LocalDateTime.class, new JacksonLocalDateTimeSerializer());
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(javaTimeModule);
return mapper;
}
}
英文:
You can use StdSerializer
public class JacksonLocalDateSerializer extends StdSerializer<LocalDate> {
private static final long serialVersionUID = -7880057299936771237L;
private static final DateTimeFormatter formatter =
DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
.withResolverStyle(ResolverStyle.STRICT);
public JacksonLocalDateSerializer() {
this(null);
}
public JacksonLocalDateSerializer(Class<LocalDate> type) {
super(type);
}
@Override
public void serialize(LocalDate value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
jsonGenerator.writeString(formatter.format(value));
}
}
Then add configuration for the serializer for applicable the entire application
@Configuration
public class JacksonConfig {
@Bean
@Primary
public ObjectMapper configureObjectMapper() {
JavaTimeModule javaTimeModule = new JavaTimeModule();
javaTimeModule.addSerializer(LocalDateTime.class, new JacksonLocalDateTimeSerializer());
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(javaTimeModule);
return mapper;
}
}
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