如何使Spring Data Elasticsearch与java.time.LocalDateTime一起使用以获取日期

Question

我正在使用Spring Data对Elasticsearch的支持。这是时间戳字段映射：

@Field(type = FieldType.Date, index = FieldIndex.not_analyzed, store = true,
        format = DateFormat.custom, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSZZ")
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern ="yyyy-MM-dd'T'HH:mm:ss.SSSZZ")
private LocalDateTime timestamp;

这导致Elasticsearch中的字段映射如下：

"timestamp":{"type":"date","store":true,"format":"yyyy-MM-dd'T'HH:mm:ss.SSSZZ"}

当我使用java.util.Date时，一切正常。但是，当我如上所述切换到java.time.LocalDateTime时，发送到Elasticsearch的文档导致异常。这是文档（为简洁起见，时间戳字段）：

"timestamp": {
    "hour":7, "minute":56, "second":9, "nano":147000000, "year":2017, "month":"FEBRUARY",
    "dayOfMonth":13, "dayOfWeek":"MONDAY", "dayOfYear":44, "monthValue":2, "chronology": {
        "id":"ISO", "calendarType": "iso8601"
    }
}

和例外：

MapperParsingException[failed to parse [timestamp]]; nested: IllegalArgumentException[unknown property [hour]];
(...)
Caused by: java.lang.IllegalArgumentException: unknown property [hour]

似乎在对文档进行json转换时，此处的模式已被忽略。有任何提示吗？也许您可能知道如何在Spring Data中使用“内置” _timestamp字段？

Answer 1

检查https://github.com/spring-projects/spring-data-elasticsearch/wiki/Custom-
ObjectMapper
添加JavaTimeModule到您的中ObjectMapper。

@Configuration
public class ElasticSearchConfiguration {

  @Bean
  public ElasticsearchTemplate elasticsearchTemplate(Client client) {
    return new ElasticsearchTemplate(client, new CustomEntityMapper());
  }

  public static class CustomEntityMapper implements EntityMapper {

    private final ObjectMapper objectMapper;

    public CustomEntityMapper() {
      objectMapper = new ObjectMapper();
      objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
      objectMapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
      objectMapper.registerModule(new CustomGeoModule());
      objectMapper.registerModule(new JavaTimeModule());
    }

    @Override
    public String mapToString(Object object) throws IOException {
      return objectMapper.writeValueAsString(object);
    }

    @Override
    public <T> T mapToObject(String source, Class<T> clazz) throws IOException {
      return objectMapper.readValue(source, clazz);
    }
  }
}