当实体类中的字段为​​Long​​​类型，且值超过前端​​js​​显示的长度范围时会导致前端回显错误。

方法1、使用JsonSerialize注解序列化的时候把Long自动转为String（单个属性）

import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;

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

 方法2、添加JacksonConfig配置全局序列化（全部属性）

package com.framework.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;

/**
 * Jackson配置
 *
 */
@Configuration
public class JacksonConfig
{
    @Bean
    public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter()
    {
        final Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
        builder.serializationInclusion(JsonInclude.Include.NON_NULL);
        final ObjectMapper objectMapper = builder.build();
        SimpleModule simpleModule = new SimpleModule();
        // Long 转为 String 防止 js 丢失精度
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        // 忽略 transient 关键词属性
        objectMapper.configure(MapperFeature.PROPAGATE_TRANSIENT_MARKER, true);
        return new MappingJackson2HttpMessageConverter(objectMapper);
    }
}