springboot返回给前端数据将null值转化为空字符串

迈不过友情╰ 2022-12-15 12:39 356阅读 0赞

`springboot返回给页面的json数据中，如果有数据为null，则返回空字符串。`

`springboot默认使用jackson解析返回json数据。`

`我们做一下配置：`

package com.yhcode.config;
     
    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;
     
    /** * 处理 jackson 返回的null值 * */
    @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;
        }
    }

`这样就可以将返回json中的null值转为空字符串了。`

转载自：[https://blog.csdn.net/MisshqZzz/article/details/84977616?utm\_medium=distribute.pc\_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel\_param&depth\_1-utm\_source=distribute.pc\_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel\_param][https_blog.csdn.net_MisshqZzz_article_details_84977616_utm_medium_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param_depth_1-utm_source_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param]

[https_blog.csdn.net_MisshqZzz_article_details_84977616_utm_medium_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param_depth_1-utm_source_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param]: https://blog.csdn.net/MisshqZzz/article/details/84977616?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param