Question

是否需要为Spring 4.2.5.RELEASE

添加

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
        </list>
    </property>
</bean>

我使用的是旧版本的弹簧而不记得添加它。我正在从3.2.7升级到4.2.5并找到了这个。

Answer 1

默认情况下，在新版本的Spring MVC中预先启用了以下HttpMessageConverters实例：

ByteArrayHttpMessageConverter – converts byte arrays
StringHttpMessageConverter – converts Strings
ResourceHttpMessageConverter – converts org.springframework.core.io.Resource  for any type of octet stream
SourceHttpMessageConverter – converts javax.xml.transform.Source
FormHttpMessageConverter – converts form data to/from a MultiValueMap<String, String>.
Jaxb2RootElementHttpMessageConverter – converts Java objects to/from XML (added only if JAXB2 is present on the classpath)
MappingJackson2HttpMessageConverter – converts JSON (added only if Jackson 2 is present on the classpath)
MappingJacksonHttpMessageConverter – converts JSON (added only if Jackson is present on the classpath)
AtomFeedHttpMessageConverter – converts Atom feeds (added only if Rome is present on the classpath)
RssChannelHttpMessageConverter – converts RSS feeds (added only if Rome is present on the classpath)

OP进一步询问我使用的是什么viewResolver。我认为向他展示我使用的所有消息转换器和viewResolver是合适的。

@Inject ObjectMapper objectMapper;
@Inject Marshaller marshaller;
@Inject Unmarshaller unmarshaller;
@Inject SpringValidatorAdapter validator;
@Override
public void configureMessageConverters(
List<HttpMessageConverter<?>> converters
) {
converters.add(new SourceHttpMessageConverter<>());
MarshallingHttpMessageConverter xmlConverter =
new MarshallingHttpMessageConverter();
xmlConverter.setSupportedMediaTypes(Arrays.asList(
new MediaType("application", "xml"),
new MediaType("text", "xml")
));
xmlConverter.setMarshaller(this.marshaller);
xmlConverter.setUnmarshaller(this.unmarshaller);
converters.add(xmlConverter);
MappingJackson2HttpMessageConverter jsonConverter =
new MappingJackson2HttpMessageConverter();
jsonConverter.setSupportedMediaTypes(Arrays.asList(
new MediaType("application", "json"),
new MediaType("text", "json")
));
jsonConverter.setObjectMapper(this.objectMapper);
converters.add(jsonConverter);
}
@Override
public void configureContentNegotiation(
ContentNegotiationConfigurer configurer)
{
configurer.favorPathExtension(false).favorParameter(false)
.ignoreAcceptHeader(false)
.defaultContentType(MediaType.APPLICATION_JSON);
}

@Bean
public LocaleResolver localeResolver()
{
return new AcceptHeaderLocaleResolver();
}
}

 @Bean
public ObjectMapper objectMapper()
{
    ObjectMapper mapper = new ObjectMapper();
    mapper.findAndRegisterModules();
    mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
    mapper.configure(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE,
            false);
    return mapper;
}

@Bean
public Jaxb2Marshaller jaxb2Marshaller()
{
    Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
    marshaller.setPackagesToScan(new String[] { "PACKAGE_NAME" });
    return marshaller;
}

Spring MVC版本4.2.5.RELEASE明确要求HttpMessageConverter用于application / json

1 个答案: