springboot 控制序列化反序列化示例（接口返回数据处理/接口接收数据处理）-526互联

1.返回Long转JSON

package com.mingx.drone.config;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;

/**
 * @Description: JavaScript无法精确地表示大于Number.MAX_SAFE_INTEGER（即9007199254740991）的整数
 * 返回的数值过大转换为字符串
 * @Author: gch
 * @Date: 2023/9/7 16:39
 */
public class IdLongSerializer extends JsonSerializer<Long> {
    @Override
    public void serialize(Long value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        if (value > 900000000000000L) {
            gen.writeString(value.toString());
        } else {
            gen.writeNumber(value);
        }
    }
}

@Bean
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
//        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        SimpleModule module = new SimpleModule();
        module.addSerializer(Long.class, new IdLongSerializer());
        module.addSerializer(Long.TYPE, new IdLongSerializer());
        objectMapper.registerModule(module);
        return objectMapper;
    }

配置文件中设置日期格式可以解决日期序列化问题

spring:
  jackson:
    #  格式化返回时间 yyyy-MM-dd HH:mm:ss
    date-format: yyyy-MM-dd HH:mm:ss
    time-zone: GMT+8

不同的情况可以直接在属性上使用注解优先级高于上述配置文件中配置

@JsonFormat(pattern = "yyyy-MM-dd", timezone = "GMT+8")

接收date数据反序列化问题

添加配置文件如下（Date属性测试没问题 DateTime类型没有测试）

package com.mingx.drone.config;

import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.boot.jackson.JsonComponent;
import org.springframework.context.annotation.Bean;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.TimeZone;

@JsonComponent
public class DateFormatConfig {

    @Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
    private String pattern;

    /**
     * @author xiaofu
     * @description date 类型全局时间格式化
     * @date 2020/8/31 18:22
     */
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilder() {

        return builder -> {
            TimeZone tz = TimeZone.getTimeZone("UTC");
            DateFormat df = new SimpleDateFormat(pattern);
            df.setTimeZone(tz);
            builder.failOnEmptyBeans(false)
                    .failOnUnknownProperties(false)
                    .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
                    .dateFormat(df);
        };
    }

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(pattern)));
    }
}