fastJson：自定义反序列化器实现参数转换

背景

与 Spring：自定义 Converter 实现参数转换，需求类似，但经过测试及源码分析，上述实现只针对GET接口有效。针对POST接口，可以按以下方式将参数从yyyy-MM-dd HH:mm:ss 转化为yyyy-MM-dd。

实现

自定义反序列化器(实现ObjectDeserializer接口，自定义匹配、转换逻辑)

@Component
public class BizDateDeserializer implements ObjectDeserializer {
    @Override
    public <T> T deserialze(DefaultJSONParser parser, Type type, Object o) {
        if (type.getTypeName().equals(Date.class.getName())) {
            Date date = parser.parseObject(Date.class);
            return (T) DateUtil.beginOfDay(date);
        } else if (String.class.getName().equals(type.getTypeName())) {
            String date = parser.parseObject(String.class);
            return (T) DateUtil.beginOfDay(DateUtil.parse(date));
        }
        return (T) parser.parseObject(type.getClass());
    }

    @Override
    public int getFastMatchToken() {
        return ObjectDeserializer.super.getFastMatchToken();
    }
}

添加自定义的反序列化器到fastJson转换器

@Configuration
@DependsOn("webConfig")
public class IWebMvcConfigurer implements WebMvcConfigurer {
    @Autowired private BizDateDeserializer bizDateDeserializer;

    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        if (CollUtil.isNotEmpty(converters)) {
            for (HttpMessageConverter<?> converter : converters) {
                if (converter instanceof FastJsonHttpMessageConverter) {
                    FastJsonConfig fastJsonConfig =
                            ((FastJsonHttpMessageConverter) converter).getFastJsonConfig();
                    fastJsonConfig
                            .getParserConfig()
                            .putDeserializer(BizDateDeserializer.class, bizDateDeserializer);
                }
            }
        }
    }
}

使用

@Data
public class RoomSearchQuery {

    @JSONField(deserializeUsing = BizDateDeserializer.class)
    private Date beginDate;

    @JSONField(deserializeUsing = BizDateDeserializer.class)
    private Date endDate;

    private List<String> stas;

    private List<String> roomTypes;
	//......
}