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springboot中如何配置LocalDateTime JSON返回時(shí)間戳

 更新時(shí)間：2023年06月01日 15:13:50   作者：jamesluozhiwei  
這篇文章主要介紹了springboot中如何配置LocalDateTime JSON返回時(shí)間戳問(wèn)題。具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

springboot配置LocalDateTime JSON返回時(shí)間戳

方案一

創(chuàng)建配置類

注意：使用這種方式，所有Controller的JSON數(shù)據(jù)返回，只要是LocalDateTime類型都會(huì)被轉(zhuǎn)成時(shí)間戳

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import java.io.IOException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
/**
 * @author jamesluozhiwei
 * @date 2019/12/18
 */
@Configuration
public class LocalDateTimeSerializerConfig {
    /**
     * 序列化LocalDateTime
     * @return
     */
    @Bean
    @Primary
    public ObjectMapper serializingObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer());
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer());
        objectMapper.registerModule(javaTimeModule);
        return objectMapper;
    }
    /**
     * 序列化實(shí)現(xiàn)
     */
    public static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
        @Override
        public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers)
                throws IOException {
            if (value != null){
                long timestamp = value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
                gen.writeNumber(timestamp);
            }
        }
    }
    /**
     * 反序列化實(shí)現(xiàn)
     */
    public static class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
        @Override
        public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext)
                throws IOException {
            long timestamp = p.getValueAsLong();
            if (timestamp > 0){
                return LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp),ZoneId.systemDefault());
            }else{
                return null;
            }
        }
    }
}

方案二

和方案一 一樣都是實(shí)現(xiàn)序列化和反序列化接口

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import java.io.IOException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
/**
 * @author jamesluozhiwei
 * @date 2019/12/18
 */
@Configuration
public class LocalDateTimeSerializerConfig {
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> {
            builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer());
            builder.deserializerByType(LocalDateTime.class,new LocalDateTimeDeserializer());
        };
    }
    /**
     * 序列化
     */
    public static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
        @Override
        public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers)
                throws IOException {
            if (value != null){
                long timestamp = value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
                gen.writeNumber(timestamp);
            }
        }
    }
    /**
     * 反序列化
     */
    public static class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
        @Override
        public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext)
                throws IOException {
            long timestamp = p.getValueAsLong();
            if (timestamp > 0){
                return LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp),ZoneId.systemDefault());
            }else{
                return null;
            }
        }
    }
}

springboot中的時(shí)間以Json返回格式不正確的解決

如果后端數(shù)據(jù)庫(kù)存儲(chǔ)時(shí)間類型的數(shù)據(jù)使用了datetime類型，那么后端查出來(lái)的數(shù)據(jù)就是LocalDateTime類型，此時(shí)若以Json傳給前端，那么前端接收到的時(shí)間里就會(huì)有“T”，此時(shí)只要在傳參上加上標(biāo)簽即可：

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime createTime;

而如果傳給前端的是LocalDate的時(shí)間類型，前端接收到的時(shí)間也是不正常的，此時(shí)需要加上標(biāo)簽處理：

@JsonFormat(pattern = "yyyy-MM-dd")
private LocalDate bizTime;

如果以上方法還是不能解決問(wèn)題，可嘗試使用：

@JSONField(format="yyyy-MM-dd HH:mm:ss")

總結(jié)

如果你有更好的方法，可以相互討論學(xué)習(xí)一下~

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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