org.codehaus.jackson.map

枚举 SerializationConfig.Feature

java.lang.Object

java.lang.Enum<SerializationConfig.Feature>

org.codehaus.jackson.map.SerializationConfig.Feature

所有已实现的接口:

Serializable, Comparable<SerializationConfig.Feature>, MapperConfig.ConfigFeature

封闭类:

SerializationConfig

public static enum SerializationConfig.Feature
extends Enum<SerializationConfig.Feature>
implements MapperConfig.ConfigFeature

Enumeration that defines togglable features that guide the serialization feature.

枚举常量概要

枚举常量

枚举常量和说明
AUTO_DETECT_FIELDS Feature that determines whether non-static fields are recognized as properties.
AUTO_DETECT_GETTERS Feature that determines whether regualr "getter" methods are automatically detected based on standard Bean naming convention or not.
AUTO_DETECT_IS_GETTERS Feature that determines whether "is getter" methods are automatically detected based on standard Bean naming convention or not.
CAN_OVERRIDE_ACCESS_MODIFIERS Feature that determines whether method and field access modifier settings can be overridden when accessing properties.
CLOSE_CLOSEABLE Feature that determines whether close method of serialized root level objects (ones for which ObjectMapper's writeValue() (or equivalent) method is called) that implement Closeable is called after serialization or not.
DEFAULT_VIEW_INCLUSION Feature that determines whether properties that have no view annotations are included in JSON serialization views (see JsonView for more details on JSON Views).
FAIL_ON_EMPTY_BEANS Feature that determines what happens when no accessors are found for a type (and there are no annotations to indicate it is meant to be serialized).
FLUSH_AFTER_WRITE_VALUE Feature that determines whether JsonGenerator.flush() is called after writeValue() method that takes JsonGenerator as an argument completes (i.e. does NOT affect methods that use other destinations); same for methods in ObjectWriter.
INDENT_OUTPUT Feature that allows enabling (or disabling) indentation for the underlying generator, using the default pretty printer (see JsonGenerator.useDefaultPrettyPrinter() for details).
REQUIRE_SETTERS_FOR_GETTERS Feature that determines whether getters (getter methods) can be auto-detected if there is no matching mutator (setter, constructor parameter or field) or not: if set to true, only getters that match a mutator are auto-discovered; if false, all auto-detectable getters can be discovered.
SORT_PROPERTIES_ALPHABETICALLY Feature that defines default property serialization order used for POJO fields (note: does not apply to Map serialization!)
USE_ANNOTATIONS Feature that determines whether annotation introspection is used for configuration; if enabled, configured AnnotationIntrospector will be used: if disabled, no annotations are considered.
USE_STATIC_TYPING Feature that determines whether the type detection for serialization should be using actual dynamic runtime type, or declared static type.
WRAP_EXCEPTIONS Feature that determines whether Jackson code should catch and wrap Exceptions (but never Errors!)
WRAP_ROOT_VALUE Feature that can be enabled to make root value (usually JSON Object but can be any type) wrapped within a single property JSON object, where key as the "root name", as determined by annotation introspector (esp. for JAXB that uses @XmlRootElement.name) or fallback (non-qualified class name).
WRITE_CHAR_ARRAYS_AS_JSON_ARRAYS Feature that determines how type char[] is serialized: when enabled, will be serialized as an explict JSON array (with single-character Strings as values); when disabled, defaults to serializing them as Strings (which is more compact).
WRITE_DATE_KEYS_AS_TIMESTAMPS Feature that determines whether Dates (and sub-types) used as Map keys are serialized as timestamps or not (if not, will be serialized as textual values).
WRITE_DATES_AS_TIMESTAMPS Feature that determines whether Date values (and Date-based things like Calendars) are to be serialized as numeric timestamps (true; the default), or as something else (usually textual representation).
WRITE_EMPTY_JSON_ARRAYS Feature that determines whether Container properties (POJO properties with declared value of Collection or array; i.e. things that produce JSON arrays) that are empty (have no elements) will be serialized as empty JSON arrays (true), or suppressed from output (false).
WRITE_ENUMS_USING_INDEX Feature that determines whethere Java Enum values are serialized as numbers (true), or textual values (false).
WRITE_ENUMS_USING_TO_STRING Feature that determines standard serialization mechanism used for Enum values: if enabled, return value of Enum.toString() is used; if disabled, return value of Enum.name() is used.
WRITE_NULL_MAP_VALUES Feature that determines whether Map entries with null values are to be serialized (true) or not (false).
WRITE_NULL_PROPERTIES 已过时。 As of 1.1, use SerializationConfig.setSerializationInclusion(org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion) instead

方法概要

方法

限定符和类型	方法和说明
boolean	enabledByDefault() Accessor for checking whether this feature is enabled by default.
int	getMask() Returns bit mask for this feature instance
static SerializationConfig.Feature	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static SerializationConfig.Feature[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

USE_ANNOTATIONS

public static final SerializationConfig.Feature USE_ANNOTATIONS

Feature that determines whether annotation introspection is used for configuration; if enabled, configured AnnotationIntrospector will be used: if disabled, no annotations are considered.

Feature is enabled by default.

从以下版本开始:

1.2

AUTO_DETECT_GETTERS

public static final SerializationConfig.Feature AUTO_DETECT_GETTERS

Feature that determines whether regualr "getter" methods are automatically detected based on standard Bean naming convention or not. If yes, then all public zero-argument methods that start with prefix "get" are considered as getters. If disabled, only methods explicitly annotated are considered getters.

Note that since version 1.3, this does NOT include "is getters" (see AUTO_DETECT_IS_GETTERS for details)

Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.

Feature is enabled by default.

AUTO_DETECT_IS_GETTERS

public static final SerializationConfig.Feature AUTO_DETECT_IS_GETTERS

Feature that determines whether "is getter" methods are automatically detected based on standard Bean naming convention or not. If yes, then all public zero-argument methods that start with prefix "is", and whose return type is boolean are considered as "is getters". If disabled, only methods explicitly annotated are considered getters.

Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.

Feature is enabled by default.

AUTO_DETECT_FIELDS

public static final SerializationConfig.Feature AUTO_DETECT_FIELDS

Feature that determines whether non-static fields are recognized as properties. If yes, then all public member fields are considered as properties. If disabled, only fields explicitly annotated are considered property fields.

Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.

Feature is enabled by default.

从以下版本开始:

1.1

CAN_OVERRIDE_ACCESS_MODIFIERS

public static final SerializationConfig.Feature CAN_OVERRIDE_ACCESS_MODIFIERS

Feature that determines whether method and field access modifier settings can be overridden when accessing properties. If enabled, method AccessibleObject.setAccessible(java.lang.reflect.AccessibleObject[], boolean) may be called to enable access to otherwise unaccessible objects.

Feature is enabled by default.

REQUIRE_SETTERS_FOR_GETTERS

public static final SerializationConfig.Feature REQUIRE_SETTERS_FOR_GETTERS

Feature that determines whether getters (getter methods) can be auto-detected if there is no matching mutator (setter, constructor parameter or field) or not: if set to true, only getters that match a mutator are auto-discovered; if false, all auto-detectable getters can be discovered.

Feature is disabled by default for backwards compatibility reasons.

从以下版本开始:

1.9

WRITE_NULL_PROPERTIES

@Deprecated
public static final SerializationConfig.Feature WRITE_NULL_PROPERTIES

已过时。 As of 1.1, use SerializationConfig.setSerializationInclusion(org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion) instead

Feature that determines the default settings of whether Bean properties with null values are to be written out.

Feature is enabled by default (null properties written).

Note too that there is annotation JsonWriteNullProperties that can be used for more granular control (annotates bean classes or individual property access methods).

USE_STATIC_TYPING

public static final SerializationConfig.Feature USE_STATIC_TYPING

Feature that determines whether the type detection for serialization should be using actual dynamic runtime type, or declared static type. Default value is false, to use dynamic runtime type.

This global default value can be overridden at class, method or field level by using JsonSerialize.typing() annotation property

DEFAULT_VIEW_INCLUSION

public static final SerializationConfig.Feature DEFAULT_VIEW_INCLUSION

Feature that determines whether properties that have no view annotations are included in JSON serialization views (see JsonView for more details on JSON Views). If enabled, non-annotated properties will be included; when disabled, they will be excluded. So this feature changes between "opt-in" (feature disabled) and "opt-out" (feature enabled) modes.

Default value is enabled, meaning that non-annotated properties are included in all views if there is no JsonView annotation.

从以下版本开始:

1.5

WRAP_ROOT_VALUE

public static final SerializationConfig.Feature WRAP_ROOT_VALUE

Feature that can be enabled to make root value (usually JSON Object but can be any type) wrapped within a single property JSON object, where key as the "root name", as determined by annotation introspector (esp. for JAXB that uses @XmlRootElement.name) or fallback (non-qualified class name). Feature is mostly intended for JAXB compatibility.

Default setting is false, meaning root value is not wrapped.

从以下版本开始:

1.7

INDENT_OUTPUT

public static final SerializationConfig.Feature INDENT_OUTPUT

Feature that allows enabling (or disabling) indentation for the underlying generator, using the default pretty printer (see JsonGenerator.useDefaultPrettyPrinter() for details).

Note that this only affects cases where JsonGenerator is constructed implicitly by ObjectMapper: if explicit generator is passed, its configuration is not changed.

Also note that if you want to configure details of indentation, you need to directly configure the generator: there is a method to use any PrettyPrinter instance. This feature will only allow using the default implementation.

SORT_PROPERTIES_ALPHABETICALLY

public static final SerializationConfig.Feature SORT_PROPERTIES_ALPHABETICALLY

Feature that defines default property serialization order used for POJO fields (note: does not apply to Map serialization!): if enabled, default ordering is alphabetic (similar to how JsonPropertyOrder.alphabetic() works); if disabled, order is unspecified (based on what JDK gives us, which may be declaration order, but not guaranteed).

Note that this is just the default behavior, and can be overridden by explicit overrides in classes.

从以下版本开始:

1.8

FAIL_ON_EMPTY_BEANS

public static final SerializationConfig.Feature FAIL_ON_EMPTY_BEANS

Feature that determines what happens when no accessors are found for a type (and there are no annotations to indicate it is meant to be serialized). If enabled (default), an exception is thrown to indicate these as non-serializable types; if disabled, they are serialized as empty Objects, i.e. without any properties.

Note that empty types that this feature has only effect on those "empty" beans that do not have any recognized annotations (like @JsonSerialize): ones that do have annotations do not result in an exception being thrown.

从以下版本开始:

1.4

WRAP_EXCEPTIONS

public static final SerializationConfig.Feature WRAP_EXCEPTIONS

Feature that determines whether Jackson code should catch and wrap Exceptions (but never Errors!) to add additional information about location (within input) of problem or not. If enabled, most exceptions will be caught and re-thrown (exception specifically being that IOExceptions may be passed as is, since they are declared as throwable); this can be convenient both in that all exceptions will be checked and declared, and so there is more contextual information. However, sometimes calling application may just want "raw" unchecked exceptions passed as is.

Feature is enabled by default, and is similar in behavior to default prior to 1.7.

从以下版本开始:

1.7

CLOSE_CLOSEABLE

public static final SerializationConfig.Feature CLOSE_CLOSEABLE

Feature that determines whether close method of serialized root level objects (ones for which ObjectMapper's writeValue() (or equivalent) method is called) that implement Closeable is called after serialization or not. If enabled, close() will be called after serialization completes (whether succesfully, or due to an error manifested by an exception being thrown). You can think of this as sort of "finally" processing.

NOTE: only affects behavior with root objects, and not other objects reachable from the root object. Put another way, only one call will be made for each 'writeValue' call.

从以下版本开始:

1.6 (see [JACKSON-282 for details])

FLUSH_AFTER_WRITE_VALUE

public static final SerializationConfig.Feature FLUSH_AFTER_WRITE_VALUE

Feature that determines whether JsonGenerator.flush() is called after writeValue() method that takes JsonGenerator as an argument completes (i.e. does NOT affect methods that use other destinations); same for methods in ObjectWriter. This usually makes sense; but there are cases where flushing should not be forced: for example when underlying stream is compressing and flush() causes compression state to be flushed (which occurs with some compression codecs).

从以下版本开始:

1.6 (see [JACKSON-401 for details])

WRITE_DATES_AS_TIMESTAMPS

public static final SerializationConfig.Feature WRITE_DATES_AS_TIMESTAMPS

Feature that determines whether Date values (and Date-based things like Calendars) are to be serialized as numeric timestamps (true; the default), or as something else (usually textual representation). If textual representation is used, the actual format is one returned by a call to MapperConfig.getDateFormat().

Note: whether this feature affects handling of other date-related types depend on handlers of those types, although ideally they should use this feature

Note: whether Map keys are serialized as Strings or not is controlled using WRITE_DATE_KEYS_AS_TIMESTAMPS.

WRITE_DATE_KEYS_AS_TIMESTAMPS

public static final SerializationConfig.Feature WRITE_DATE_KEYS_AS_TIMESTAMPS

Feature that determines whether Dates (and sub-types) used as Map keys are serialized as timestamps or not (if not, will be serialized as textual values).

Default value is 'false', meaning that Date-valued Map keys are serialized as textual (ISO-8601) values.

从以下版本开始:

1.9

WRITE_CHAR_ARRAYS_AS_JSON_ARRAYS

public static final SerializationConfig.Feature WRITE_CHAR_ARRAYS_AS_JSON_ARRAYS

Feature that determines how type char[] is serialized: when enabled, will be serialized as an explict JSON array (with single-character Strings as values); when disabled, defaults to serializing them as Strings (which is more compact).

从以下版本开始:

1.6 (see [JACKSON-289 for details])

WRITE_ENUMS_USING_TO_STRING

public static final SerializationConfig.Feature WRITE_ENUMS_USING_TO_STRING

Feature that determines standard serialization mechanism used for Enum values: if enabled, return value of Enum.toString() is used; if disabled, return value of Enum.name() is used. Since pre-1.6 method was to use Enum name, this is the default.

Note: this feature should usually have same value as DeserializationConfig.Feature.READ_ENUMS_USING_TO_STRING.

For further details, check out [JACKSON-212]

从以下版本开始:

1.6

WRITE_ENUMS_USING_INDEX

public static final SerializationConfig.Feature WRITE_ENUMS_USING_INDEX

Feature that determines whethere Java Enum values are serialized as numbers (true), or textual values (false). If textual values are used, other settings are also considered. If this feature is enabled, return value of Enum.ordinal() (an integer) will be used as the serialization.

Note that this feature has precedence over WRITE_ENUMS_USING_TO_STRING, which is only considered if this feature is set to false.

从以下版本开始:

1.9

WRITE_NULL_MAP_VALUES

public static final SerializationConfig.Feature WRITE_NULL_MAP_VALUES

Feature that determines whether Map entries with null values are to be serialized (true) or not (false).

For further details, check out [JACKSON-314]

从以下版本开始:

1.6

WRITE_EMPTY_JSON_ARRAYS

public static final SerializationConfig.Feature WRITE_EMPTY_JSON_ARRAYS

Feature that determines whether Container properties (POJO properties with declared value of Collection or array; i.e. things that produce JSON arrays) that are empty (have no elements) will be serialized as empty JSON arrays (true), or suppressed from output (false).

Note that this does not change behavior of Maps, or "Collection-like" types.

从以下版本开始:

1.9

方法详细资料

values

public static SerializationConfig.Feature[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (SerializationConfig.Feature c : SerializationConfig.Feature.values())
    System.out.println(c);

valueOf

public static SerializationConfig.Feature valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

如果该枚举类型没有带有指定名称的常量, - 则抛出 IllegalArgumentException

如果参数为空值, - 则抛出 NullPointerException

enabledByDefault

public boolean enabledByDefault()

从接口复制的说明: MapperConfig.ConfigFeature

Accessor for checking whether this feature is enabled by default.

指定者:

enabledByDefault 在接口中 MapperConfig.ConfigFeature

getMask

public int getMask()

从接口复制的说明: MapperConfig.ConfigFeature

Returns bit mask for this feature instance

指定者:

getMask 在接口中 MapperConfig.ConfigFeature