spring boot 返回的json中去掉值为null的属性

我会带着你远行 2022-03-16 10:26 588阅读 0赞

直接上代码：

import com.fasterxml.jackson.annotation.JsonInclude;
    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;
    
    @Configuration
    public class JacksonConfig { 
    
        @Bean
        @Primary
        @ConditionalOnMissingBean(ObjectMapper.class)
        public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) { 
            /*此方法可以修改值为null的参数值 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(""); } });*/
            //此方法可以直接屏蔽掉值为null的参数
            ObjectMapper objectMapper = builder.createXmlMapper(false).build();
            objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            return objectMapper;
        }
    }