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Null values as empty strings when using @ResponseBody annotation

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被撕碎了的回忆 2020-12-17 05:49

Is there a way when using @ResponseBody annotation to have null values mapped to empty strings?

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  • 星月不相逢
    星月不相逢 (楼主)
    2020-12-17 06:09

    I have also faced the same problem in my project and I have therefore quickly come up with a solution for the same. This post will surely help all those who have been struggling with the same issue.

    Step 1:- Create your Custom Null Handler Serializer.

    public class NullSerializer extends StdSerializer {

    public NullSerializer(Class t) {
       super(t);
    }

    public NullSerializer() {
      this(null);
    }

    @Override
    public void serialize(Object o, com.fasterxml.jackson.core.JsonGenerator jsonGenerator, com.fasterxml.jackson.databind.SerializerProvider serializerProvider) throws IOException {
       jsonGenerator.writeString("");
    }
   }



    Step 2:- Create a bean of MappingJackson2HttpMessageConverter.
    


    @Bean
@Primary
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {

    MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
    ObjectMapper mapper = new ObjectMapper();
    mapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
    mapper.getSerializerProvider().setNullValueSerializer(new NullSerializer());
    jsonConverter.setObjectMapper(mapper);
    return jsonConverter;

} 

    


    Thank you for taking some time out to read this post. I hope that this was able to resolve your queries to some extent.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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