方法一
pom依赖自行添加
application.yml配置文件 中添加
spring: jackson: default-property-inclusion: non_null
方法二
配置类
package com.gzkj.conf; import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.databind.ObjectMapper; 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; @Configuration public class JacksonConfig { @Bean @Primary @ConditionalOnMissingBean(ObjectMapper.class) public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) { ObjectMapper objectMapper = builder.createXmlMapper(false).build(); // 通过该方法对mapper对象进行设置，所有序列化的对象都将按改规则进行系列化 // Include.Include.ALWAYS 默认 // Include.NON_DEFAULT 属性为默认值不序列化 // Include.NON_EMPTY 属性为 空（""） 或者为 NULL 都不序列化，则返回的json是没有这个字段的。这样对移动端会更省流量 // Include.NON_NULL 属性为NULL 不序列化,就是为null的字段不参加序列化 //objectMapper.setSerializationInclusion(Include.NON_EMPTY); objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL); // 字段保留，将null值转为"" // objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() // { // @Override // public void serialize(Object o, JsonGenerator jsonGenerator, // SerializerProvider serializerProvider) // throws IOException, JsonProcessingException // { // jsonGenerator.writeString(""); // } // }); return objectMapper; } }
