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springboot中json對(duì)象中對(duì)Long類型和String類型相互轉(zhuǎn)換

更新時(shí)間：2023年11月07日 09:01:00 作者：臘筆不小新xingo

與前端聯(lián)調(diào)接口時(shí),后端一些字段設(shè)計(jì)為Long類型,這樣就有可能導(dǎo)致前端缺失精度,這時(shí)候我們就需要將Long類型返回給前端時(shí)做數(shù)據(jù)類型轉(zhuǎn)換,本文主要介紹了springboot中json對(duì)象中對(duì)Long類型和String類型相互轉(zhuǎn)換,感興趣的可以了解一下

與前端聯(lián)調(diào)接口時(shí)，后端一些字段設(shè)計(jì)為Long類型，這樣就有可能導(dǎo)致前端缺失精度，這時(shí)候我們就需要將Long類型返回給前端時(shí)做數(shù)據(jù)類型轉(zhuǎn)換，在使用springboot開發(fā)時(shí)，默認(rèn)的json序列化和反序列化使用的是Jackson，所以可以有兩種處理方式。

第一種是直接在字段上面添加注解，指定序列化字段類型：

@JsonSerialize(using = ToStringSerializer.class)
private Long id;

一般在項(xiàng)目中這樣配置可以解決單個(gè)實(shí)體類中的字段序列化，如果項(xiàng)目中的實(shí)體類非常多，這種配置方式就會(huì)顯得非常麻煩。所以我們可以調(diào)整Jackson的配置，在全局指定序列化配置：

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;

@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(ObjectMapper.class)
@AutoConfigureBefore(JacksonAutoConfiguration.class)
public class JacksonConfiguration {

    private final Map<Class<?>, JsonSerializer<?>> serializers = new LinkedHashMap<>(5);

    private final Map<Class<?>, JsonDeserializer<?>> deserializers = new LinkedHashMap<>(3);

    @Bean
    @Order(Ordered.HIGHEST_PRECEDENCE)
    Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {

        // 序列化時(shí)對(duì)Long類型進(jìn)行處理，避免前端js處理數(shù)據(jù)時(shí)精度缺失
        serializers.put(Long.class, ToStringSerializer.instance);
        serializers.put(Long.TYPE, ToStringSerializer.instance);

        // java8日期處理
        serializers.put(LocalDateTime.class,
                new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        serializers.put(LocalDate.class,
                new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        serializers.put(LocalTime.class,
                new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        deserializers.put(LocalDateTime.class,
                new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        deserializers.put(LocalDate.class,
                new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        deserializers.put(LocalTime.class,
                new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));

        return customizer -> customizer
                .featuresToDisable(SerializationFeature.FAIL_ON_EMPTY_BEANS,
                        SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,
                        SerializationFeature.WRITE_DURATIONS_AS_TIMESTAMPS,
                        DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
                //.propertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE)    // 駝峰字段轉(zhuǎn)下劃線字段
                .serializationInclusion(Include.NON_NULL).serializersByType(serializers)
                .deserializersByType(deserializers).simpleDateFormat("yyyy-MM-dd HH:mm:ss").timeZone("GMT+8")
                .locale(Locale.SIMPLIFIED_CHINESE);
    }

}

第二種方式可以避免每個(gè)實(shí)體類中都配置序列化方式，但是這種方式也限制了項(xiàng)目的靈活性，它會(huì)對(duì)全局?jǐn)?shù)據(jù)都產(chǎn)生影響，對(duì)比第一種它顯然不夠靈活。

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