JacksonConfig 处理空字符，001值报错_jackson空字段报错是什么-优快云博客

本文链接：https://blog.youkuaiyun.com/wasd986523/article/details/108549483

本文详细介绍了如何在SpringBoot项目中配置Jackson库，包括解决数值前导零的问题、统一处理null值以及创建自定义的ObjectMapper实例。通过这些配置，可以提升项目的数据处理效率和一致性。

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package com.jzlife.hudong.config;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser.Feature;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import java.io.IOException;


@Configuration
public class JacksonConfig {
    @Value("${spring.application.name}")
    private String applicationName;

    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        
            objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
                @Override
                public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
                    jsonGenerator.writeString("");//设置后台返回前天为null的值，统一为空字符""
                }
            });
           
            
            objectMapper.enable(Feature.ALLOW_NUMERIC_LEADING_ZEROS);//设置解析0001这样的值报错问题；
        boolean boo=objectMapper.getFactory().isEnabled(Feature.ALLOW_NUMERIC_LEADING_ZEROS);
        System.out.println(boo);
        return objectMapper;
    }
}