SpringBoot笔记--Jackson

    SpringUtil.getBean<GenericConversionService>().addConverter(Date2LocalDateTimeConverter())
    var handerAdapter = SpringUtil.context.getBean(RequestMappingHandlerAdapter::class.java);

    var listResolvers = mutableListOf<HandlerMethodArgumentResolver>()
    listResolvers.add(RequestParameterConverter(listOf(ApiParam::class.java)));
    listResolvers.addAll(handerAdapter.argumentResolvers)

    handerAdapter.argumentResolvers = listResolvers;

internal class MyJsonMapper
@JvmOverloads private constructor()
    : ObjectMapper() {

    init {
        // 设置输出时包含属性的风格
        this.findAndRegisterModules();
        this.setSerializationInclusion(JsonInclude.Include.NON_EMPTY)

        // 允许单引号、允许不带引号的字段名称
        this.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true)
        this.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true)

        // 设置输入时忽略在JSON字符串中存在但Java对象实际没有的属性
        this.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
        // 空值处理为空串
        this.serializerProvider.setNullValueSerializer(object : JsonSerializer<Any>() {
            @Throws(IOException::class, JsonProcessingException::class)
            override fun serialize(value: Any, jgen: JsonGenerator,
                                   provider: SerializerProvider) {
                jgen.writeString("")
            }
        })

        this.registerModule(CustomModule());

        // 进行HTML解码。
//        this.registerModule(SimpleModule().addSerializer(String::class.java, object : JsonSerializer<String>() {
//            @Throws(IOException::class, JsonProcessingException::class)
//            override fun serialize(value: String, jgen: JsonGenerator,
//                                   provider: SerializerProvider) {
//                jgen.writeString(StringEscapeUtils.unescapeHtml4(value))
//            }
//        }))
        // 设置时区
        this.setTimeZone(TimeZone.getDefault())//getTimeZone("GMT+8:00")
    }

    companion object {

        /**
         * 创建只输出非Null且非Empty(如List.isEmpty)的属性到Json字符串的Mapper,建议在外部接口中使用.
         */
        val instance: MyJsonMapper = MyJsonMapper();
    }
}

// 先定义一个json生成器
class ObjectIdJsonSerializer : JsonSerializer<ObjectId>() {
    override fun serialize(o: ObjectId?, j: JsonGenerator, s: SerializerProvider) {
        if (o == null) {
            j.writeNull()
        } else {
            j.writeString(o.toString())
        }
    }
}

class LocalDateJsonSerializer : JsonSerializer<LocalDate>() {
    override fun serialize(value: LocalDate?, generator: JsonGenerator, serializers: SerializerProvider) {
        if (value == null) {
            generator.writeNull()
        } else {
            generator.writeNumber(Date.from(value.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant()).time)
        }
    }
}

class LocalTimeJsonSerializer : JsonSerializer<LocalTime>() {
    override fun serialize(value: LocalTime?, generator: JsonGenerator, serializers: SerializerProvider) {
        if (value == null) {
            generator.writeNull()
        } else {
            generator.writeString(value.AsString())
        }
    }
}

class LocalDateTimeJsonSerializer : JsonSerializer<LocalDateTime>() {
    override fun serialize(value: LocalDateTime?, generator: JsonGenerator, serializers: SerializerProvider) {
        if (value == null) {
            generator.writeNull()
        } else {
            generator.writeNumber(Date.from(value.atZone(ZoneId.systemDefault()).toInstant()).time)
        }
    }
}

class LocalDateJsonDeserializer : JsonDeserializer<LocalDate>() {
    override fun deserialize(json: JsonParser?, ctxt: DeserializationContext?): LocalDate? {
        if (json == null) {
            return null;
        }

        if (json.valueAsString.contains("-")) {
            return json.valueAsString.AsLocalDateTime().toLocalDate();
        }

        return Date(json.longValue).AsLocalDateTime().toLocalDate();
    }
}

class LocalTimeJsonDeserializer : JsonDeserializer<LocalTime>() {
    override fun deserialize(json: JsonParser?, ctxt: DeserializationContext?): LocalTime? {
        if (json == null) {
            return null;
        }

        if (json.valueAsString.contains(".")) {
            return LocalTime.parse(json.valueAsString, DateTimeFormatter.ofPattern("HH:mm:ss.sss"))
        }

        return LocalTime.parse(json.valueAsString, DateTimeFormatter.ofPattern("HH:mm:ss"))
    }
}

class LocalDateTimeJsonDeserializer : JsonDeserializer<LocalDateTime>() {
    override fun deserialize(json: JsonParser?, ctxt: DeserializationContext?): LocalDateTime? {
        if (json == null) {
            return null;
        }

        if (json.valueAsString.contains("-")) {
            return json.valueAsString.AsLocalDateTime();
        }

        return Date(json.longValue).AsLocalDateTime();
    }
}

//Jackson 输出的时候，进行自定义序列化格式。
// http://www.jianshu.com/p/a0fb6559f56d
@Component
class CustomModule() : SimpleModule(PackageVersion.VERSION) {
    init {
        addSerializer(ObjectId::class.java, ObjectIdJsonSerializer());
        addSerializer(LocalDate::class.java, LocalDateJsonSerializer());
        addSerializer(LocalTime::class.java, LocalTimeJsonSerializer());
        addSerializer(LocalDateTime::class.java, LocalDateTimeJsonSerializer());

        addDeserializer(LocalDate::class.java, LocalDateJsonDeserializer())
        addDeserializer(LocalTime::class.java, LocalTimeJsonDeserializer())
        addDeserializer(LocalDateTime::class.java, LocalDateTimeJsonDeserializer())
    }
}

fun <T> T.ToJson(): String {
    if (this is String) return this;

    return MyJsonMapper.instance.writeValueAsString(this) ?: ""
}

fun <T> String.FromJson(collectionClass: Class<T>): T {
    if (collectionClass == String::class.java) {
        return this as T
    }

    var jsonString = this.RemoveComment().Remove("\r\n", "\n")
    if (jsonString.isEmpty()) {
        return collectionClass.newInstance();
    }

    return MyJsonMapper.instance.readValue(jsonString, collectionClass)!!
}

inline fun <reified T> String.FromJson(): T {
    return this.FromJson(T::class.java)
}

class RequestParameterConverter(var canIgnoreAnnotationClazzes: List<Class<*>> = listOf()) : HandlerMethodArgumentResolver {
    override fun supportsParameter(parameter: MethodParameter?): Boolean {

        if (parameter == null) return false

        if (ServletRequest::class.java.isAssignableFrom(parameter.parameterType)) return false
        if (ServletResponse::class.java.isAssignableFrom(parameter.parameterType)) return false
        if (HttpSession::class.java.isAssignableFrom(parameter.parameterType)) return false

        if (parameter.hasParameterAnnotation(PathVariable::class.java)) return false;
        if (parameter.hasParameterAnnotation(CookieValue::class.java)) return false;
        if (parameter.hasParameterAnnotation(RequestHeader::class.java)) return false;
        if (parameter.hasParameterAnnotation(RequestParam::class.java)) return false;

        var parameterAnnotations = parameter.parameterAnnotations.toMutableList();
        parameterAnnotations.removeAll { Nullable::class.java.isInstance(it) }
        parameterAnnotations.removeAll { NotNull::class.java.isInstance(it) }

        canIgnoreAnnotationClazzes.forEach { ignoreClazz ->
            parameterAnnotations.removeAll { ignoreClazz.isInstance(it) }
        }

        if (parameterAnnotations.size > 0) return false;

        return true
        //return parameter?.hasParameterAnnotation(JsonValue::class.java) ?: false;
    }

    override fun resolveArgument(parameter: MethodParameter?, mavContainer: ModelAndViewContainer?, webRequest: NativeWebRequest?, binderFactory: WebDataBinderFactory?): Any? {
        if (parameter == null || mavContainer == null || webRequest == null || binderFactory == null) return null

        var key = parameter.parameterName
        var request = (webRequest as ServletWebRequest).request as MyHttpRequestWrapper;
        var value: Any? = null

        if (request.json.containsKey(key)) {
            value = request.json.get(key)
        } else if (request.requestMap.contains(key)) {
            value = request.requestMap.get(request.queryString);
        }

        if (value == null || (value is String && value.isEmpty())) {
            if (parameter.parameterType == String::class.java) {
                return "";
            } else if (Number::class.java.isAssignableFrom(parameter.parameterType)) {
                return MyUtil.getSimpleClassDefaultValue(parameter.parameterType);
            } else if (parameter.parameterType.isArray) {
                return "[]".FromJson(parameter.parameterType)
            } else if (Iterable::class.java.isAssignableFrom(parameter.parameterType)) {
                return "[]".FromJson(parameter.parameterType);
            }
            return null;
//            var nullable = parameter.parameterAnnotations.any { Nullable::class.java.isInstance(it) }
//
//            if (nullable) {
//                return null;
//            }
//            return MyUtil.getSimpleClassDefaultValue(parameter.parameterType)
        }

        if (parameter.parameterType.isEnum) {
            return value.AsString().ToEnum(parameter.parameterType)
        } else if (value.javaClass.isInstance(parameter.parameterType)) {
            return value;
        } else if (parameter.parameterType == Boolean::class.java) {
            return value.AsBoolean()
        } else if (parameter.parameterType == Character::class.java) {
            return value.toString()[0]
        } else if (parameter.parameterType == Byte::class.java) {
            return value.AsInt().toByte()
        } else if (parameter.parameterType == Short::class.java) {
            return value.AsInt().toShort()
        } else if (parameter.parameterType == Int::class.java ||
                parameter.parameterType == java.lang.Integer::class.java) {
            return value.AsInt()
        } else if (parameter.parameterType == Long::class.java) {
            return value.AsLong()
        } else if (parameter.parameterType == Float::class.java) {
            return value.AsDouble()
        } else if (parameter.parameterType == Double::class.java) {
            return value.AsDouble().toLong()
        } else if (parameter.parameterType == String::class.java) {
            return value.AsString()
        } else if (parameter.parameterType == LocalDate::class.java) {
            return value.AsLocalDateTime().toLocalDate()
        } else if (parameter.parameterType == LocalTime::class.java) {
            return value.AsLocalDateTime().toLocalTime()
        } else if (parameter.parameterType == LocalDateTime::class.java) {
            return value.AsLocalDateTime()
        } else if (parameter.parameterType == Date::class.java) {
            return Date.from(value.AsLocalDateTime().atZone(ZoneId.systemDefault()).toInstant());
        } else {
            return value.AsString().FromJson(parameter.parameterType);
        }
        return value
    }

}

@Configuration
open class MongoConfig {

    @Bean
    @Throws(Exception::class)
    open fun mongoTemplate(): MongoTemplate {

        var dbFactory = SpringUtil.getBean<MongoDbFactory>();
        //remove _class
        val converter = MappingMongoConverter(DefaultDbRefResolver(dbFactory), MongoMappingContext())
        converter.typeMapper = DefaultMongoTypeMapper(null)

        (converter.conversionService as GenericConversionService).addConverter(Date2LocalDateTimeConverter())

        return MongoTemplate(dbFactory, converter)
    }

}

class Date2LocalDateTimeConverter : GenericConverter {
    override fun getConvertibleTypes(): MutableSet<GenericConverter.ConvertiblePair> {
        var pairs = hashSetOf<GenericConverter.ConvertiblePair>();
        pairs.add(GenericConverter.ConvertiblePair(String::class.java, LocalDate::class.java));
        pairs.add(GenericConverter.ConvertiblePair(String::class.java, LocalTime::class.java));
        pairs.add(GenericConverter.ConvertiblePair(String::class.java, LocalDateTime::class.java));
        pairs.add(GenericConverter.ConvertiblePair(Date::class.java, LocalDate::class.java));
        pairs.add(GenericConverter.ConvertiblePair(Date::class.java, LocalTime::class.java));
        pairs.add(GenericConverter.ConvertiblePair(Date::class.java, LocalDateTime::class.java));
        pairs.add(GenericConverter.ConvertiblePair(LocalDate::class.java, Date::class.java));
        pairs.add(GenericConverter.ConvertiblePair(LocalTime::class.java, Date::class.java));
        pairs.add(GenericConverter.ConvertiblePair(LocalDateTime::class.java, Date::class.java));
        return pairs;
    }

    override fun convert(value: Any?, sourceType: TypeDescriptor?, targetType: TypeDescriptor?): Any? {
        if (value == null || sourceType == null || targetType == null) return null

        var valueClass = sourceType.type;
        var targetClass = targetType.type;

        if (valueClass == String::class.java) {
            var strValue = value.AsString();
            if (strValue.isEmpty()) {
                return null;
            }

            if (targetClass == LocalDate::class.java) {
                return strValue.AsLocalDateTime().toLocalDate();
            }
            if (targetClass == LocalTime::class.java) {
                return strValue.AsLocalDateTime().toLocalTime()
            }
            if (targetClass == LocalDateTime::class.java) {
                return strValue.AsLocalDateTime();
            }
        }

        if (valueClass == Date::class.java) {
            if (targetClass == LocalDate::class.java) {
                return value.AsLocalDateTime().toLocalDate();
            }
            if (targetClass == LocalTime::class.java) {
                return value.AsLocalDateTime().toLocalTime();
            }
            if (targetClass == LocalDateTime::class.java) {
                return value.AsLocalDateTime()
            }
        }

        if (targetClass == Date::class.java) {
            if (valueClass == LocalDate::class.java) {
                return Date.from((value as LocalDate).atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
            }
            if (valueClass == LocalTime::class.java) {
                return Date.from((value as LocalTime).atDate("1970-01-01".AsLocalDateTime().toLocalDate()).atZone(ZoneId.systemDefault()).toInstant());
            }
            if (valueClass == LocalDateTime::class.java) {
                return Date.from((value as LocalDateTime).atZone(ZoneId.systemDefault()).toInstant());
            }
        }

        return null;
    }

}

问题

返回实体时,如:

• JsonTypedResult 类型, 当有消息时, 仅返回: JsonResult
• JsonTypedResult 类型, 当 data.id 为 "000000000" 时, 返回 id= ""