JacksonConfig 配置 Long 序列化规则

将超长 long 值转换为 string，解决前端 JavaScript 最大安全整数是 2^53-1 的问题；

自定义Long序列化规则

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;import java.io.IOException;/*** Long 序列化规则** 会将超长 long 值转换为 string，解决前端 JavaScript 最大安全整数是 2^53-1 的问题** @author 星语*/
@JacksonStdImpl
public class NumberSerializer extends com.fasterxml.jackson.databind.ser.std.NumberSerializer {private static final long MAX_SAFE_INTEGER = 9007199254740991L;private static final long MIN_SAFE_INTEGER = -9007199254740991L;public static final NumberSerializer INSTANCE = new NumberSerializer(Number.class);public NumberSerializer(Class<? extends Number> rawType) {super(rawType);}@Overridepublic void serialize(Number value, JsonGenerator gen, SerializerProvider serializers) throws IOException {// 超出范围 序列化位字符串if (value.longValue() > MIN_SAFE_INTEGER && value.longValue() < MAX_SAFE_INTEGER) {super.serialize(value, gen, serializers);} else {gen.writeString(value.toString());}}
}

注入使用

import cn.hutool.core.date.DatePattern;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.yryb.common.core.jackson.BigNumberSerializer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
import org.springframework.context.annotation.Bean;import java.math.BigDecimal;
import java.math.BigInteger;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.TimeZone;/*** jackson 配置** @author YZD*/
@Slf4j
@AutoConfiguration(before = JacksonAutoConfiguration.class)
public class JacksonConfig {@Beanpublic Jackson2ObjectMapperBuilderCustomizer customizer() {return builder -> {// 全局配置序列化返回 JSON 处理JavaTimeModule javaTimeModule = new JavaTimeModule();javaTimeModule.addSerializer(Long.class, BigNumberSerializer.INSTANCE);javaTimeModule.addSerializer(Long.TYPE, BigNumberSerializer.INSTANCE);javaTimeModule.addSerializer(BigInteger.class, BigNumberSerializer.INSTANCE);javaTimeModule.addSerializer(BigDecimal.class, ToStringSerializer.instance);DateTimeFormatter formatter = DatePattern.NORM_DATETIME_FORMAT.getDateTimeFormatter();javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(formatter));javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(formatter));builder.modules(javaTimeModule);builder.timeZone(TimeZone.getDefault());log.info("初始化 jackson 配置");};}}

其他自定义参考

基于时间戳的 LocalDateTime 反序列化器

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;import java.io.IOException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;/*** 基于时间戳的 LocalDateTime 反序列化器** @author 老五*/
public class TimestampLocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {public static final TimestampLocalDateTimeDeserializer INSTANCE = new TimestampLocalDateTimeDeserializer();@Overridepublic LocalDateTime deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {// 将 Long 时间戳，转换为 LocalDateTime 对象return LocalDateTime.ofInstant(Instant.ofEpochMilli(p.getValueAsLong()), ZoneId.systemDefault());}}

基于时间戳的 LocalDateTime 序列化器

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;import java.io.IOException;
import java.time.LocalDateTime;
import java.time.ZoneId;/*** 基于时间戳的 LocalDateTime 序列化器** @author 老五*/
public class TimestampLocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {public static final TimestampLocalDateTimeSerializer INSTANCE = new TimestampLocalDateTimeSerializer();@Overridepublic void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {// 将 LocalDateTime 对象，转换为 Long 时间戳gen.writeNumber(value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());}}