关于后端到前端空字符串自动转换为null的问题

Jiang_LH01

已于 2022-11-02 21:08:43 修改

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文章标签：前端 json java

于 2021-07-22 18:00:59 首次发布

本文链接：https://blog.youkuaiyun.com/Jiang_LH01/article/details/119005657

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本文介绍如何通过自定义Jackson ObjectMapper配置，确保后端返回的空字符串在前端解析时自动转换为null，提升数据处理的灵活性和一致性。

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关于后端到前端空字符串自动转换为null的问题


```java
在这里插package com.tinyzk.consumer.c.conf;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
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;
 
/**
 * 描述: 处理数据返回的null值
 * @author Administrator
 * @create 2018-10-18 14:51
 */
@Configuration
public class JacksonConfig {
    @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("");
            }
        });
        return objectMapper;
    }
}
入代码片


是用此配置，可将null转换为空字符串