java - 如何使 Spring Data Elasticsearch 使用 java.time.LocalDateTime 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;

这导致字段在 Elasticsearch 中的映射如下:

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

当我改用 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 的文档会导致异常。这是文档(时间戳字段仅为简洁起见):

"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"
    }
}

异常(exception)情况:

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

在对文档进行 json 化处理时，似乎此处的模式被忽略了。任何可能的提示？或者您可能知道如何在 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将 JavaTimeModule 添加到您的 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);
    }
  }
}