ES8.x查询踩坑指南

不知道是不是版本问题，但肯定是8.x的锅，就是构建完条件以后执行查询时候反序列化老是出现问题，具体如下面这行代码，还是在elastic讨论社区才找到答案：https://discuss.elastic.co/t/jsonp-mapping-exception/306992

    SearchResponse<AnnouncementESDTO> searchResponse = elasticsearchClient.search(searchRequest, AnnouncementESDTO.class);

实体类配置

具体来说就是实体类反序列化出现了问题，我完整的实体类定义如下，修改两方面

1. 类上增加@JsonIgnoreProperties(ignoreUnknown = true)注解，表示忽略实体类里面没有属性

2. 日期字段不仅显式声明，反序列化时候指定序列化器@JsonDeserialize(using = CustomLocalDateDeserializer.class)，反序列化器的配置如下

@Document(indexName = "announcement")
@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class AnnouncementESDTO {
    private static final String DATE_TIME_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
    private static final String DATE_PATTERN = "yyyy-MM-dd";
    @Id
    private Long id;

    private String title;

    private String content;

    @Field(index = true, store = true, type = FieldType.Date, format = {}, pattern = DATE_PATTERN)
    @JsonDeserialize(using = CustomLocalDateDeserializer.class)
    private LocalDate pubTime;

    private String url;

    @Field(index = false, store = true, type = FieldType.Date, format = {}, pattern = DATE_TIME_PATTERN)
    @JsonDeserialize(using = CustomLocalDateTimeDeserializer.class)
    private LocalDateTime createTime;

    private Long articleId;

    private String school;
}

自定义序列化器配置

package com.ischool.config;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

import java.io.IOException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

/**
 * @program: iSchool-Server
 * @author: AlbertZhang
 * @create: 2024-05-19 22:17
 * @description:
 **/
public class CustomLocalDateDeserializer extends JsonDeserializer<LocalDate> {
    private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    @Override
    public LocalDate deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        return LocalDate.parse(p.getText(), formatter);
    }
}

package com.ischool.config;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/*
* 解决es日期问题
* */
public class CustomLocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
    private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");

    @Override
    public LocalDateTime deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        return LocalDateTime.parse(p.getText(), formatter);
    }

}

最后吐槽一下：世上配置千千万，JSON序列化占一半啊