SpringBoot2序列化相关

最常用的序列化

将null值不序列化

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@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,属性为NULL 不序列化
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
return objectMapper;
}

将null值序列化为””

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@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,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 {
jsonGenerator.writeString("");
}
});
return objectMapper;
}

将Long和long转字符串

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// 使用的序列化工具是jackson
@Bean
public MappingJackson2HttpMessageConverter longToStringConverter() {
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
ObjectMapper mapper = new ObjectMapper();
SimpleModule simpleModule = new SimpleModule();
simpleModule.addSerializer(Long.class, ToStringSerializer.instance);//Long
simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);//long
mapper.registerModule(simpleModule);
converter.setObjectMapper(mapper);
return converter;
}

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