工具类:序列化反序列化

package com.example.mp.config;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @author Mr.Lan
 * @version 1.0
 * @ClassName LocalDateTimeConfig$
 * @description 序列化和反序列化配置类
 * @date 2025/2/26 17:44
 **/
@Configuration
public class LocalDateTimeConfig {

    /**
     * 序列化内容 LocalDateTime -> String
     * 服务端返回给客户端内容
     */
    @Bean
    public LocalDateTimeSerializer localDateTimeSerializer() {
        return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
    }

    /**
     * 反序列化内容 String -> LocalDateTime
     * 客户端传入服务端数据
     */
    @Bean
    public LocalDateTimeDeserializer localDateTimeDeserializer() {
        return new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
    }

    // 配置
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> {
            builder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
            builder.deserializerByType(LocalDateTime.class, localDateTimeDeserializer());
        };
    }



    //Long和String转换精度丢失问题
    @Bean
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        SimpleModule module = new SimpleModule();

        module.addSerializer(Long.class, new LongToStringSerializer());
        module.addDeserializer(Long.class, new StringToLongDeserializer());

        objectMapper.registerModule(module);
        return objectMapper;
    }

    public static class LongToStringSerializer extends StdSerializer {
        public LongToStringSerializer() {
            super(Long.class);
        }

        @Override
        public void serialize(Long value, JsonGenerator gen, SerializerProvider provider) throws IOException {
            gen.writeString(String.valueOf(value));
        }
    }

    public static class StringToLongDeserializer extends StdDeserializer {
        public StringToLongDeserializer() {
            super(Long.class);
        }

        @Override
        public Long deserialize(JsonParser p, com.fasterxml.jackson.databind.DeserializationContext ctxt) throws IOException {
            String value = p.getText();
            return Long.valueOf(value);
        }
    }
}