org.codehaus.jackson

枚举 JsonGenerator.Feature

java.lang.Object

java.lang.Enum<JsonGenerator.Feature>

org.codehaus.jackson.JsonGenerator.Feature

所有已实现的接口:

Serializable, Comparable<JsonGenerator.Feature>

封闭类:

JsonGenerator

public static enum JsonGenerator.Feature
extends Enum<JsonGenerator.Feature>

Enumeration that defines all togglable features for generators.

枚举常量概要

枚举常量

枚举常量和说明
AUTO_CLOSE_JSON_CONTENT Feature that determines what happens when the generator is closed while there are still unmatched JsonToken.START_ARRAY or JsonToken.START_OBJECT entries in output content.
AUTO_CLOSE_TARGET Feature that determines whether generator will automatically close underlying output target that is NOT owned by the generator.
ESCAPE_NON_ASCII Feature that specifies that all characters beyond 7-bit ASCII range (i.e. code points of 128 and above) need to be output using format-specific escapes (for JSON, backslash escapes), if format uses escaping mechanisms (which is generally true for textual formats but not for binary formats).
FLUSH_PASSED_TO_STREAM Feature that specifies that calls to JsonGenerator.flush() will cause matching flush() to underlying OutputStream or Writer; if disabled this will not be done.
QUOTE_FIELD_NAMES Feature that determines whether JSON Object field names are quoted using double-quotes, as specified by JSON specification or not.
QUOTE_NON_NUMERIC_NUMBERS Feature that determines whether "exceptional" (not real number) float/double values are output as quoted strings.
WRITE_NUMBERS_AS_STRINGS Feature that forces all Java numbers to be written as JSON strings.

方法概要

方法

限定符和类型	方法和说明
static int	collectDefaults() Method that calculates bit set (flags) of all features that are enabled by default.
boolean	enabledByDefault()
int	getMask()
static JsonGenerator.Feature	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static JsonGenerator.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

AUTO_CLOSE_TARGET

public static final JsonGenerator.Feature AUTO_CLOSE_TARGET

Feature that determines whether generator will automatically close underlying output target that is NOT owned by the generator. If disabled, calling application has to separately close the underlying OutputStream and Writer instances used to create the generator. If enabled, generator will handle closing, as long as generator itself gets closed: this happens when end-of-input is encountered, or generator is closed by a call to JsonGenerator.close().

Feature is enabled by default.

AUTO_CLOSE_JSON_CONTENT

public static final JsonGenerator.Feature AUTO_CLOSE_JSON_CONTENT

Feature that determines what happens when the generator is closed while there are still unmatched JsonToken.START_ARRAY or JsonToken.START_OBJECT entries in output content. If enabled, such Array(s) and/or Object(s) are automatically closed; if disabled, nothing specific is done.

Feature is enabled by default.

QUOTE_FIELD_NAMES

public static final JsonGenerator.Feature QUOTE_FIELD_NAMES

Feature that determines whether JSON Object field names are quoted using double-quotes, as specified by JSON specification or not. Ability to disable quoting was added to support use cases where they are not usually expected, which most commonly occurs when used straight from Javascript.

QUOTE_NON_NUMERIC_NUMBERS

public static final JsonGenerator.Feature QUOTE_NON_NUMERIC_NUMBERS

Feature that determines whether "exceptional" (not real number) float/double values are output as quoted strings. The values checked are Double.Nan, Double.POSITIVE_INFINITY and Double.NEGATIVE_INIFINTY (and associated Float values). If feature is disabled, these numbers are still output using associated literal values, resulting in non-conformant output.

Feature is enabled by default.

WRITE_NUMBERS_AS_STRINGS

public static final JsonGenerator.Feature WRITE_NUMBERS_AS_STRINGS

Feature that forces all Java numbers to be written as JSON strings. Default state is 'false', meaning that Java numbers are to be serialized using basic numeric serialization (as JSON numbers, integral or floating point). If enabled, all such numeric values are instead written out as JSON Strings.

One use case is to avoid problems with Javascript limitations: since Javascript standard specifies that all number handling should be done using 64-bit IEEE 754 floating point values, result being that some 64-bit integer values can not be accurately represent (as mantissa is only 51 bit wide).

Feature is disabled by default.

从以下版本开始:

1.3

FLUSH_PASSED_TO_STREAM

public static final JsonGenerator.Feature FLUSH_PASSED_TO_STREAM

Feature that specifies that calls to JsonGenerator.flush() will cause matching flush() to underlying OutputStream or Writer; if disabled this will not be done. Main reason to disable this feature is to prevent flushing at generator level, if it is not possible to prevent method being called by other code (like ObjectMapper or third party libraries).

Feature is enabled by default.

从以下版本开始:

1.7

ESCAPE_NON_ASCII

public static final JsonGenerator.Feature ESCAPE_NON_ASCII

Feature that specifies that all characters beyond 7-bit ASCII range (i.e. code points of 128 and above) need to be output using format-specific escapes (for JSON, backslash escapes), if format uses escaping mechanisms (which is generally true for textual formats but not for binary formats).

从以下版本开始:

1.8

方法详细资料

values

public static JsonGenerator.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 (JsonGenerator.Feature c : JsonGenerator.Feature.values())
    System.out.println(c);

valueOf

public static JsonGenerator.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

collectDefaults

public static int collectDefaults()

Method that calculates bit set (flags) of all features that are enabled by default.

enabledByDefault

public boolean enabledByDefault()

getMask

public int getMask()