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| /** * @program: canary * @description: spring 内置的json处理框架是Jackson。我们可以对它配置达到不返回Null属性的json数据 * @author: wb * @create: 2018-07-26 17:39 **/
@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);
/* 为空的不参加序列化 */ 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; } }
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