情况如下。我有一个ObjectMapper(Jackson 2),它注册一个JodaModule,能够序列化和反序列化Joda DateTime类型。此ObjectMapper已使用自定义JSON字符串进行了测试,并且可以正常工作。
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new JodaModule());
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+1:00"));
objectMapper.setDateFormat(new ISO8601DateFormat());
objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
return objectMapper;
我有一个RestTemplateFactory,它负责实例化RestTemplate,并将先前配置的ObjectMapper bean设置为RestTemplate。
@Configuration
public class RestTemplateFactory {
@Autowired
private ObjectMapper objectMapper;
@Bean
public RestTemplate createRestTemplate() {
RestTemplate restTemplate = new RestTemplate();
List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
MappingJackson2HttpMessageConverter jsonMessageConverter = new MappingJackson2HttpMessageConverter();
jsonMessageConverter.setObjectMapper(objectMapper);
messageConverters.add(jsonMessageConverter);
// restTemplate.setMessageConverters(messageConverters); // This line was missing, but needs to be here. See answer.
return restTemplate;
}
}
现在,当我联系Web服务时,它无法使用以下错误消息反序列化DateTime对象:
org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not instantiate value of type [simple type, class org.joda.time.DateTime] from String value; no single-String constructor/factory method
此外,永远不会调用DateTimeDeserializer.class。有人知道我在这里想念什么吗?
好的,我的createRestTemplate()方法中缺少此行。
restTemplate.setMessageConverters(messageConverters);
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