spring4和springboot过滤null属性或将null属性转为空字符串

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spring4和springboot过滤null属性或将null属性转为空字符串

有资料显示可以在springboot提供的application.properties中配置　spring.jackson.default-property-inclusion=non_null　我试了下，并没有什么卵用。

作用范围Bean

1. @JsonInclude(JsonInclude.Include.NON_NULL)

作用范围整个工程

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@Bean
public RequestMappingHandlerAdapter mappingHandlerAdapter() {
    RequestMappingHandlerAdapter mappingHandlerAdapter = new RequestMappingHandlerAdapter();
    mappingHandlerAdapter.setCustomArgumentResolvers(Arrays.asList(new XssHandlerMethodArgumentResolver()));
    // null过滤
    MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setDateFormat(new SimpleDateFormat(BaseEntity.DATE_TIME_FORMAT));
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    jackson2HttpMessageConverter.setObjectMapper(objectMapper);
    mappingHandlerAdapter.setMessageConverters(Arrays.asList(jackson2HttpMessageConverter));
    return mappingHandlerAdapter;
}

这种写法有个问题,会导致spring的Valid注解不起作用。无法使用验证框架,改进方式如下：

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@Bean
public HttpMessageConverter messageConverter() {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setDateFormat(new SimpleDateFormat(BaseEntity.DATE_TIME_FORMAT));
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter(objectMapper);
    return messageConverter;
}

spring4和springboot的null属性转为空字符串

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@Bean
public HttpMessageConverter messageConverter() {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setDateFormat(new SimpleDateFormat(BaseEntity.DATE_TIME_FORMAT));
    objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
        @Override
        public void serialize(Object value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {
            gen.writeString("");
        }
    });
    HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter(objectMapper);
    return messageConverter;
}

以上,本人请测.