springboot 配置LocalDateTime JSON返回时间戳

方案一

创建配置类

注意：使用这种方式，所有Controller的JSON数据返回，只要是LocalDateTime类型都会被转成时间戳

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;
    }

    /**
     * 序列化实现
     */
    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);
            }
        }
    }

    /**
     * 反序列化实现
     */
    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 一样都是实现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;
            }
        }
    }
}