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1. 实现接口

package com.example.mongodemo.config;import com.fasterxml.jackson.core.JsonGenerator;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 com.fasterxml.jackson.databind.JsonSerializer;import com.fasterxml.jackson.databind.SerializerProvider;import java.io.IOException;import java.time.Instant;/** * @Author lyr * @create 2020/3/23 22:27 */public class InstantConfig {
       public static class InstantDeserializer extends JsonDeserializer
   
     {
           @Override        public Instant deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws  IOException {
               String text = jsonParser.getText();            Long aLong = Long.valueOf(text);            Instant res = Instant.ofEpochMilli(aLong);            return res;        }    }    public static class InstantSerializer extends JsonSerializer
    
      {
           @Override        public void serialize(Instant instant, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
               jsonGenerator.writeNumber(instant.toEpochMilli());        }    }}
    
   

2. 打注解：

@JsonSerialize(using = InstantConfig.InstantSerializer.class)    @JsonDeserialize(using = InstantConfig.InstantDeserializer.class)    @NotNull    private Instant startTime;

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