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）

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)));
    }
}