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SpringBoot返回Long型数据前端精度丢失问题处理

接口参数多余报错问题

当JSON数据中包含Java对象未定义的属性时，Jackson框架无法识别这些额外字段，因为它们没有被标记为可忽略，从而引发“Unrecognized field, not marked as ignorable”错误

Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unrecognized field "sort" (class com.fan.vo.category.CategoryEditReq), not marked as ignorable]

Long型数据前端精度丢失问题

前端接收后端接口中Long类型数据精度丢失问题可能与前端的数据处理方式有关。在JavaScript中，数字类型是使用浮点数来表示的，而浮点数的精度是有限的，可能导致长整型数据的精度丢失

配置Long类型精度丢失后时间格式不正确问题

变成了时间戳

统一解决方案

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.text.SimpleDateFormat;
import java.util.List;
import java.util.TimeZone;

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.removeIf(MappingJackson2HttpMessageConverter.class::isInstance);
        converters.add(0, new MappingJackson2HttpMessageConverter(objectMapper()));
    }

    @Bean
    public ObjectMapper objectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        //忽略未知属性
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        //日期格式转换
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        mapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        //Long类型转String类型
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        mapper.registerModule(simpleModule);
        return mapper;
    }

}

配置为字符类型返回

配置代码

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.text.SimpleDateFormat;
import java.util.TimeZone;

/**
 * Jackson 全局配置
 */
@Configuration
public class WebMvcConfig {

    @Bean
    public ObjectMapper objectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        // 忽略未知属性
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 日期格式
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        mapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        // Long 转 String（防止前端精度丢失）
        SimpleModule module = new SimpleModule();
        module.addSerializer(Long.class, ToStringSerializer.instance);
        module.addSerializer(Long.TYPE, ToStringSerializer.instance);
        mapper.registerModule(module);
        return mapper;
    }
}