org.codehaus.jackson

类 JsonParser

java.lang.Object

org.codehaus.jackson.JsonParser

所有已实现的接口:

Closeable, AutoCloseable, Versioned

直接已知子类:

JsonParserDelegate, JsonParserMinimalBase

public abstract class JsonParser
extends Object
implements Closeable, Versioned

Base class that defines public API for reading JSON content. Instances are created using factory methods of a JsonFactory instance.

作者:

Tatu Saloranta

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	JsonParser.Feature Enumeration that defines all togglable features for parsers.
static class	JsonParser.NumberType Enumeration of possible "native" (optimal) types that can be used for numbers.

字段概要

字段

限定符和类型	字段和说明
protected JsonToken	_currToken Last token retrieved via nextToken(), if any.
protected int	_features Bit flag composed of bits that indicate which JsonParser.Features are enabled.
protected JsonToken	_lastClearedToken Last cleared token, if any: that is, value that was in effect when clearCurrentToken() was called.

构造器概要

构造器

限定符	构造器和说明
protected	JsonParser()
protected	JsonParser(int features)

方法概要

方法

限定符和类型	方法和说明
protected JsonParseException	_constructError(String msg) Helper method for constructing JsonParseExceptions based on current state of the parser
boolean	canUseSchema(FormatSchema schema) Method that can be used to verify that given schema can be used with this parser (using setSchema(org.codehaus.jackson.FormatSchema)).
void	clearCurrentToken() Method called to "consume" the current token by effectively removing it so that hasCurrentToken() returns false, and getCurrentToken() null).
abstract void	close() Closes the parser so that no further iteration or data access can be made; will also close the underlying input source if parser either owns the input source, or feature JsonParser.Feature.AUTO_CLOSE_SOURCE is enabled.
JsonParser	configure(JsonParser.Feature f, boolean state) Method for enabling or disabling specified feature (check JsonParser.Feature for list of features)
JsonParser	disable(JsonParser.Feature f) Method for disabling specified feature (check JsonParser.Feature for list of features)
void	disableFeature(JsonParser.Feature f) 已过时。 Use disable(Feature) instead
JsonParser	enable(JsonParser.Feature f) Method for enabling specified parser feature (check JsonParser.Feature for list of features)
void	enableFeature(JsonParser.Feature f) 已过时。 Use enable(Feature) instead
abstract BigInteger	getBigIntegerValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can not be used as a Java long primitive type due to its magnitude.
byte[]	getBinaryValue() Convenience alternative to getBinaryValue(Base64Variant) that defaults to using Base64Variants.getDefaultVariant() as the default encoding.
abstract byte[]	getBinaryValue(Base64Variant b64variant) Method that can be used to read (and consume -- results may not be accessible using other methods after the call) base64-encoded binary data included in the current textual JSON value.
boolean	getBooleanValue() Convenience accessor that can be called when the current token is JsonToken.VALUE_TRUE or JsonToken.VALUE_FALSE.
byte	getByteValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a value of Java byte primitive type.
abstract ObjectCodec	getCodec() Accessor for ObjectCodec associated with this parser, if any.
abstract JsonLocation	getCurrentLocation() Method that returns location of the last processed character; usually for error reporting purposes.
abstract String	getCurrentName() Method that can be called to get the name associated with the current token: for JsonToken.FIELD_NAMEs it will be the same as what getText() returns; for field values it will be preceding field name; and for others (array values, root-level values) null.
JsonToken	getCurrentToken() Accessor to find which token parser currently points to, if any; null will be returned if none.
abstract BigDecimal	getDecimalValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_FLOAT or JsonToken.VALUE_NUMBER_INT.
abstract double	getDoubleValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_FLOAT and it can be expressed as a Java double primitive type.
Object	getEmbeddedObject() Accessor that can be called if (and only if) the current token is JsonToken.VALUE_EMBEDDED_OBJECT.
abstract float	getFloatValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_FLOAT and it can be expressed as a Java float primitive type.
Object	getInputSource() Method that can be used to get access to object that is used to access input being parsed; this is usually either InputStream or Reader, depending on what parser was constructed with.
abstract int	getIntValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a value of Java int primitive type.
JsonToken	getLastClearedToken() Method that can be called to get the last token that was cleared using clearCurrentToken().
abstract long	getLongValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a Java long primitive type.
abstract JsonParser.NumberType	getNumberType() If current token is of type JsonToken.VALUE_NUMBER_INT or JsonToken.VALUE_NUMBER_FLOAT, returns one of JsonParser.NumberType constants; otherwise returns null.
abstract Number	getNumberValue() Generic number value accessor method that will work for all kinds of numeric values.
abstract JsonStreamContext	getParsingContext() Method that can be used to access current parsing context reader is in.
short	getShortValue() Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a value of Java short primitive type.
abstract String	getText() Method for accessing textual representation of the current token; if no current token (before first call to nextToken(), or after encountering end-of-input), returns null.
abstract char[]	getTextCharacters() Method similar to getText(), but that will return underlying (unmodifiable) character array that contains textual value, instead of constructing a String object to contain this information.
abstract int	getTextLength() Accessor used with getTextCharacters(), to know length of String stored in returned buffer.
abstract int	getTextOffset() Accessor used with getTextCharacters(), to know offset of the first text content character within buffer.
abstract JsonLocation	getTokenLocation() Method that return the starting location of the current token; that is, position of the first character from input that starts the current token.
boolean	getValueAsBoolean() Method that will try to convert value of current token to a boolean.
boolean	getValueAsBoolean(boolean defaultValue) Method that will try to convert value of current token to a boolean.
double	getValueAsDouble() Method that will try to convert value of current token to a Java double.
double	getValueAsDouble(double defaultValue) Method that will try to convert value of current token to a Java double.
int	getValueAsInt() Method that will try to convert value of current token to a int.
int	getValueAsInt(int defaultValue) Method that will try to convert value of current token to a int.
long	getValueAsLong() Method that will try to convert value of current token to a long.
long	getValueAsLong(long defaultValue) Method that will try to convert value of current token to a long.
boolean	hasCurrentToken() Method for checking whether parser currently points to a token (and data for that token is available).
boolean	hasTextCharacters() Method that can be used to determine whether calling of getTextCharacters() would be the most efficient way to access textual content for the event parser currently points to.
abstract boolean	isClosed() Method that can be called to determine whether this parser is closed or not.
boolean	isEnabled(JsonParser.Feature f) Method for checking whether specified JsonParser.Feature is enabled.
boolean	isExpectedStartArrayToken() Specialized accessor that can be used to verify that the current token indicates start array (usually meaning that current token is JsonToken.START_ARRAY) when start array is expected.
boolean	isFeatureEnabled(JsonParser.Feature f) 已过时。 Use isEnabled(Feature) instead
Boolean	nextBooleanValue() Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_TRUE or JsonToken.VALUE_FALSE returns matching Boolean value; otherwise return null.
boolean	nextFieldName(SerializableString str) Method that fetches next token (as if calling nextToken()) and verifies whether it is JsonToken.FIELD_NAME with specified name and returns result of that comparison.
int	nextIntValue(int defaultValue) Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 32-bit int value; otherwise returns specified default value It is functionally equivalent to: return (nextToken() == JsonToken.VALUE_NUMBER_INT) ?
long	nextLongValue(long defaultValue) Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 64-bit long value; otherwise returns specified default value It is functionally equivalent to: return (nextToken() == JsonToken.VALUE_NUMBER_INT) ?
String	nextTextValue() Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_STRING returns contained String value; otherwise returns null.
abstract JsonToken	nextToken() Main iteration method, which will advance stream enough to determine type of the next token, if any.
JsonToken	nextValue() Iteration method that will advance stream enough to determine type of the next token that is a value type (including JSON Array and Object start/end markers).
<T> T	readValueAs(Class<T> valueType) Method to deserialize JSON content into a non-container type (it can be an array type, however): typically a bean, array or a wrapper type (like Boolean).
<T> T	readValueAs(TypeReference<?> valueTypeRef) Method to deserialize JSON content into a Java type, reference to which is passed as argument.
JsonNode	readValueAsTree() Method to deserialize JSON content into equivalent "tree model", represented by root JsonNode of resulting model.
<T> Iterator<T>	readValuesAs(Class<T> valueType) Method for reading sequence of Objects from parser stream, all with same specified value type.
<T> Iterator<T>	readValuesAs(TypeReference<?> valueTypeRef) Method for reading sequence of Objects from parser stream, all with same specified value type.
int	releaseBuffered(OutputStream out) Method that can be called to push back any content that has been read but not consumed by the parser.
int	releaseBuffered(Writer w) Method that can be called to push back any content that has been read but not consumed by the parser.
abstract void	setCodec(ObjectCodec c) Setter that allows defining ObjectCodec associated with this parser, if any.
void	setFeature(JsonParser.Feature f, boolean state) 已过时。 Use configure(org.codehaus.jackson.JsonParser.Feature, boolean) instead
void	setSchema(FormatSchema schema) Method to call to make this parser use specified schema.
abstract JsonParser	skipChildren() Method that will skip all child tokens of an array or object token that the parser currently points to, iff stream points to JsonToken.START_OBJECT or JsonToken.START_ARRAY.
Version	version() Method called to detect version of the component that implements this interface; returned version should never be null, but may return specific "not available" instance (see Version for details).

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

_features

protected int _features

Bit flag composed of bits that indicate which JsonParser.Features are enabled.

_currToken

protected JsonToken _currToken

Last token retrieved via nextToken(), if any. Null before the first call to nextToken(), as well as if token has been explicitly cleared (by call to clearCurrentToken())

_lastClearedToken

protected JsonToken _lastClearedToken

Last cleared token, if any: that is, value that was in effect when clearCurrentToken() was called.

构造器详细资料

JsonParser

protected JsonParser()

JsonParser

protected JsonParser(int features)

方法详细资料

getCodec

public abstract ObjectCodec getCodec()

Accessor for ObjectCodec associated with this parser, if any. Codec is used by readValueAs(Class) method (and its variants).

从以下版本开始:

1.3

setCodec

public abstract void setCodec(ObjectCodec c)

Setter that allows defining ObjectCodec associated with this parser, if any. Codec is used by readValueAs(Class) method (and its variants).

从以下版本开始:

1.3

setSchema

public void setSchema(FormatSchema schema)

Method to call to make this parser use specified schema. Method must be called before trying to parse any content, right after parser instance has been created. Note that not all parsers support schemas; and those that do usually only accept specific types of schemas: ones defined for data format parser can read.

If parser does not support specified schema, UnsupportedOperationException is thrown.

参数:

schema - Schema to use

抛出:

UnsupportedOperationException - if parser does not support schema

从以下版本开始:

1.8

canUseSchema

public boolean canUseSchema(FormatSchema schema)

Method that can be used to verify that given schema can be used with this parser (using setSchema(org.codehaus.jackson.FormatSchema)).

参数:

schema - Schema to check

返回:

True if this parser can use given schema; false if not

从以下版本开始:

1.8

version

public Version version()

从接口复制的说明: Versioned

Method called to detect version of the component that implements this interface; returned version should never be null, but may return specific "not available" instance (see Version for details).

指定者:

version 在接口中 Versioned

从以下版本开始:

1.6

getInputSource

public Object getInputSource()

Method that can be used to get access to object that is used to access input being parsed; this is usually either InputStream or Reader, depending on what parser was constructed with. Note that returned value may be null in some cases; including case where parser implementation does not want to exposed raw source to caller. In cases where input has been decorated, object returned here is the decorated version; this allows some level of interaction between users of parser and decorator object.

In general use of this accessor should be considered as "last effort", i.e. only used if no other mechanism is applicable.

从以下版本开始:

1.8

close

public abstract void close()
                    throws IOException

Closes the parser so that no further iteration or data access can be made; will also close the underlying input source if parser either owns the input source, or feature JsonParser.Feature.AUTO_CLOSE_SOURCE is enabled. Whether parser owns the input source depends on factory method that was used to construct instance (so check JsonFactory for details, but the general idea is that if caller passes in closable resource (such as InputStream or Reader) parser does NOT own the source; but if it passes a reference (such as File or URL and creates stream or reader it does own them.

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

抛出:

IOException

releaseBuffered

public int releaseBuffered(OutputStream out)
                    throws IOException

Method that can be called to push back any content that has been read but not consumed by the parser. This is usually done after reading all content of interest using parser. Content is released by writing it to given stream if possible; if underlying input is byte-based it can released, if not (char-based) it can not.

返回:

-1 if the underlying content source is not byte based (that is, input can not be sent to OutputStream; otherwise number of bytes released (0 if there was nothing to release)

抛出:

IOException - if write to stream threw exception

从以下版本开始:

1.6

releaseBuffered

public int releaseBuffered(Writer w)
                    throws IOException

Method that can be called to push back any content that has been read but not consumed by the parser. This is usually done after reading all content of interest using parser. Content is released by writing it to given writer if possible; if underlying input is char-based it can released, if not (byte-based) it can not.

返回:

-1 if the underlying content source is not char-based (that is, input can not be sent to Writer; otherwise number of chars released (0 if there was nothing to release)

抛出:

IOException - if write using Writer threw exception

从以下版本开始:

1.6

enable

public JsonParser enable(JsonParser.Feature f)

Method for enabling specified parser feature (check JsonParser.Feature for list of features)

从以下版本开始:

1.2

disable

public JsonParser disable(JsonParser.Feature f)

Method for disabling specified feature (check JsonParser.Feature for list of features)

从以下版本开始:

1.2

configure

public JsonParser configure(JsonParser.Feature f,
                   boolean state)

Method for enabling or disabling specified feature (check JsonParser.Feature for list of features)

从以下版本开始:

1.2

isEnabled

public boolean isEnabled(JsonParser.Feature f)

Method for checking whether specified JsonParser.Feature is enabled.

从以下版本开始:

1.2

setFeature

public void setFeature(JsonParser.Feature f,
              boolean state)

已过时。 Use configure(org.codehaus.jackson.JsonParser.Feature, boolean) instead

enableFeature

public void enableFeature(JsonParser.Feature f)

已过时。 Use enable(Feature) instead

disableFeature

public void disableFeature(JsonParser.Feature f)

已过时。 Use disable(Feature) instead

isFeatureEnabled

public final boolean isFeatureEnabled(JsonParser.Feature f)

已过时。 Use isEnabled(Feature) instead

nextToken

public abstract JsonToken nextToken()
                             throws IOException,
                                    JsonParseException

Main iteration method, which will advance stream enough to determine type of the next token, if any. If none remaining (stream has no content other than possible white space before ending), null will be returned.

返回:

Next token from the stream, if any found, or null to indicate end-of-input

抛出:

IOException

JsonParseException

nextValue

public JsonToken nextValue()
                    throws IOException,
                           JsonParseException

Iteration method that will advance stream enough to determine type of the next token that is a value type (including JSON Array and Object start/end markers). Or put another way, nextToken() will be called once, and if JsonToken.FIELD_NAME is returned, another time to get the value for the field. Method is most useful for iterating over value entries of JSON objects; field name will still be available by calling getCurrentName() when parser points to the value.

返回:

Next non-field-name token from the stream, if any found, or null to indicate end-of-input (or, for non-blocking parsers, JsonToken.NOT_AVAILABLE if no tokens were available yet)

抛出:

IOException

JsonParseException

nextFieldName

public boolean nextFieldName(SerializableString str)
                      throws IOException,
                             JsonParseException

Method that fetches next token (as if calling nextToken()) and verifies whether it is JsonToken.FIELD_NAME with specified name and returns result of that comparison. It is functionally equivalent to:

  return (nextToken() == JsonToken.FIELD_NAME) && str.getValue().equals(getCurrentName());

but may be faster for parser to verify, and can therefore be used if caller expects to get such a property name from input next.

参数:

str - Property name to compare next token to (if next token is JsonToken.FIELD_NAME)

抛出:

IOException

JsonParseException

从以下版本开始:

1.9

nextTextValue

public String nextTextValue()
                     throws IOException,
                            JsonParseException

Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_STRING returns contained String value; otherwise returns null. It is functionally equivalent to:

  return (nextToken() == JsonToken.VALUE_STRING) ? getText() : null;

but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.

抛出:

IOException

JsonParseException

从以下版本开始:

1.9

nextIntValue

public int nextIntValue(int defaultValue)
                 throws IOException,
                        JsonParseException

Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 32-bit int value; otherwise returns specified default value It is functionally equivalent to:

  return (nextToken() == JsonToken.VALUE_NUMBER_INT) ? getIntValue() : defaultValue;

but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.

抛出:

IOException

JsonParseException

从以下版本开始:

1.9

nextLongValue

public long nextLongValue(long defaultValue)
                   throws IOException,
                          JsonParseException

Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_NUMBER_INT returns 64-bit long value; otherwise returns specified default value It is functionally equivalent to:

  return (nextToken() == JsonToken.VALUE_NUMBER_INT) ? getLongValue() : defaultValue;

but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.

抛出:

IOException

JsonParseException

从以下版本开始:

1.9

nextBooleanValue

public Boolean nextBooleanValue()
                         throws IOException,
                                JsonParseException

Method that fetches next token (as if calling nextToken()) and if it is JsonToken.VALUE_TRUE or JsonToken.VALUE_FALSE returns matching Boolean value; otherwise return null. It is functionally equivalent to:

  JsonToken t = nextToken();
  if (t == JsonToken.VALUE_TRUE) return Boolean.TRUE;
  if (t == JsonToken.VALUE_FALSE) return Boolean.FALSE;
  return null;

but may be faster for parser to process, and can therefore be used if caller expects to get a String value next from input.

抛出:

IOException

JsonParseException

从以下版本开始:

1.9

skipChildren

public abstract JsonParser skipChildren()
                                 throws IOException,
                                        JsonParseException

Method that will skip all child tokens of an array or object token that the parser currently points to, iff stream points to JsonToken.START_OBJECT or JsonToken.START_ARRAY. If not, it will do nothing. After skipping, stream will point to matching JsonToken.END_OBJECT or JsonToken.END_ARRAY (possibly skipping nested pairs of START/END OBJECT/ARRAY tokens as well as value tokens). The idea is that after calling this method, application will call nextToken() to point to the next available token, if any.

抛出:

IOException

JsonParseException

isClosed

public abstract boolean isClosed()

Method that can be called to determine whether this parser is closed or not. If it is closed, no new tokens can be retrieved by calling nextToken() (and the underlying stream may be closed). Closing may be due to an explicit call to close() or because parser has encountered end of input.

getCurrentToken

public JsonToken getCurrentToken()

Accessor to find which token parser currently points to, if any; null will be returned if none. If return value is non-null, data associated with the token is available via other accessor methods.

返回:

Type of the token this parser currently points to, if any: null before any tokens have been read, and after end-of-input has been encountered, as well as if the current token has been explicitly cleared.

hasCurrentToken

public boolean hasCurrentToken()

Method for checking whether parser currently points to a token (and data for that token is available). Equivalent to check for parser.getCurrentToken() != null.

返回:

True if the parser just returned a valid token via nextToken(); false otherwise (parser was just constructed, encountered end-of-input and returned null from nextToken(), or the token has been consumed)

clearCurrentToken

public void clearCurrentToken()

Method called to "consume" the current token by effectively removing it so that hasCurrentToken() returns false, and getCurrentToken() null). Cleared token value can still be accessed by calling getLastClearedToken() (if absolutely needed), but usually isn't.

Method was added to be used by the optional data binder, since it has to be able to consume last token used for binding (so that it will not be used again).

getCurrentName

public abstract String getCurrentName()
                               throws IOException,
                                      JsonParseException

Method that can be called to get the name associated with the current token: for JsonToken.FIELD_NAMEs it will be the same as what getText() returns; for field values it will be preceding field name; and for others (array values, root-level values) null.

抛出:

IOException

JsonParseException

getParsingContext

public abstract JsonStreamContext getParsingContext()

Method that can be used to access current parsing context reader is in. There are 3 different types: root, array and object contexts, with slightly different available information. Contexts are hierarchically nested, and can be used for example for figuring out part of the input document that correspond to specific array or object (for highlighting purposes, or error reporting). Contexts can also be used for simple xpath-like matching of input, if so desired.

getTokenLocation

public abstract JsonLocation getTokenLocation()

Method that return the starting location of the current token; that is, position of the first character from input that starts the current token.

getCurrentLocation

public abstract JsonLocation getCurrentLocation()

Method that returns location of the last processed character; usually for error reporting purposes.

getLastClearedToken

public JsonToken getLastClearedToken()

Method that can be called to get the last token that was cleared using clearCurrentToken(). This is not necessarily the latest token read. Will return null if no tokens have been cleared, or if parser has been closed.

isExpectedStartArrayToken

public boolean isExpectedStartArrayToken()

Specialized accessor that can be used to verify that the current token indicates start array (usually meaning that current token is JsonToken.START_ARRAY) when start array is expected. For some specialized parsers this can return true for other cases as well; this is usually done to emulate arrays.

Default implementation is equivalent to:

   getCurrentToken() == JsonToken.START_ARRAY

but may be overridden by custom parser implementations.

返回:

True if the current token can be considered as a start-array marker (such JsonToken.START_ARRAY); false if not.

从以下版本开始:

1.7

getText

public abstract String getText()
                        throws IOException,
                               JsonParseException

Method for accessing textual representation of the current token; if no current token (before first call to nextToken(), or after encountering end-of-input), returns null. Method can be called for any token type.

抛出:

IOException

JsonParseException

getTextCharacters

public abstract char[] getTextCharacters()
                                  throws IOException,
                                         JsonParseException

Method similar to getText(), but that will return underlying (unmodifiable) character array that contains textual value, instead of constructing a String object to contain this information. Note, however, that:

• Textual contents are not guaranteed to start at index 0 (rather, call getTextOffset()) to know the actual offset
• Length of textual contents may be less than the length of returned buffer: call getTextLength() for actual length of returned content.

Note that caller MUST NOT modify the returned character array in any way -- doing so may corrupt current parser state and render parser instance useless.

The only reason to call this method (over getText()) is to avoid construction of a String object (which will make a copy of contents).

抛出:

IOException

JsonParseException

getTextLength

public abstract int getTextLength()
                           throws IOException,
                                  JsonParseException

Accessor used with getTextCharacters(), to know length of String stored in returned buffer.

返回:

Number of characters within buffer returned by getTextCharacters() that are part of textual content of the current token.

抛出:

IOException

JsonParseException

getTextOffset

public abstract int getTextOffset()
                           throws IOException,
                                  JsonParseException

Accessor used with getTextCharacters(), to know offset of the first text content character within buffer.

返回:

Offset of the first character within buffer returned by getTextCharacters() that is part of textual content of the current token.

抛出:

IOException

JsonParseException

hasTextCharacters

public boolean hasTextCharacters()

Method that can be used to determine whether calling of getTextCharacters() would be the most efficient way to access textual content for the event parser currently points to.

Default implementation simply returns false since only actual implementation class has knowledge of its internal buffering state. Implementations are strongly encouraged to properly override this method, to allow efficient copying of content by other code.

返回:

True if parser currently has character array that can be efficiently returned via getTextCharacters(); false means that it may or may not exist

从以下版本开始:

1.6

getNumberValue

public abstract Number getNumberValue()
                               throws IOException,
                                      JsonParseException

Generic number value accessor method that will work for all kinds of numeric values. It will return the optimal (simplest/smallest possible) wrapper object that can express the numeric value just parsed.

抛出:

IOException

JsonParseException

getNumberType

public abstract JsonParser.NumberType getNumberType()
                                             throws IOException,
                                                    JsonParseException

If current token is of type JsonToken.VALUE_NUMBER_INT or JsonToken.VALUE_NUMBER_FLOAT, returns one of JsonParser.NumberType constants; otherwise returns null.

抛出:

IOException

JsonParseException

getByteValue

public byte getByteValue()
                  throws IOException,
                         JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a value of Java byte primitive type. It can also be called for JsonToken.VALUE_NUMBER_FLOAT; if so, it is equivalent to calling getDoubleValue() and then casting; except for possible overflow/underflow exception.

Note: if the resulting integer value falls outside range of Java byte, a JsonParseException will be thrown to indicate numeric overflow/underflow.

抛出:

IOException

JsonParseException

getShortValue

public short getShortValue()
                    throws IOException,
                           JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a value of Java short primitive type. It can also be called for JsonToken.VALUE_NUMBER_FLOAT; if so, it is equivalent to calling getDoubleValue() and then casting; except for possible overflow/underflow exception.

Note: if the resulting integer value falls outside range of Java short, a JsonParseException will be thrown to indicate numeric overflow/underflow.

抛出:

IOException

JsonParseException

getIntValue

public abstract int getIntValue()
                         throws IOException,
                                JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a value of Java int primitive type. It can also be called for JsonToken.VALUE_NUMBER_FLOAT; if so, it is equivalent to calling getDoubleValue() and then casting; except for possible overflow/underflow exception.

Note: if the resulting integer value falls outside range of Java int, a JsonParseException may be thrown to indicate numeric overflow/underflow.

抛出:

IOException

JsonParseException

getLongValue

public abstract long getLongValue()
                           throws IOException,
                                  JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can be expressed as a Java long primitive type. It can also be called for JsonToken.VALUE_NUMBER_FLOAT; if so, it is equivalent to calling getDoubleValue() and then casting to int; except for possible overflow/underflow exception.

Note: if the token is an integer, but its value falls outside of range of Java long, a JsonParseException may be thrown to indicate numeric overflow/underflow.

抛出:

IOException

JsonParseException

getBigIntegerValue

public abstract BigInteger getBigIntegerValue()
                                       throws IOException,
                                              JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_INT and it can not be used as a Java long primitive type due to its magnitude. It can also be called for JsonToken.VALUE_NUMBER_FLOAT; if so, it is equivalent to calling getDecimalValue() and then constructing a BigInteger from that value.

抛出:

IOException

JsonParseException

getFloatValue

public abstract float getFloatValue()
                             throws IOException,
                                    JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_FLOAT and it can be expressed as a Java float primitive type. It can also be called for JsonToken.VALUE_NUMBER_INT; if so, it is equivalent to calling getLongValue() and then casting; except for possible overflow/underflow exception.

Note: if the value falls outside of range of Java float, a JsonParseException will be thrown to indicate numeric overflow/underflow.

抛出:

IOException

JsonParseException

getDoubleValue

public abstract double getDoubleValue()
                               throws IOException,
                                      JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_FLOAT and it can be expressed as a Java double primitive type. It can also be called for JsonToken.VALUE_NUMBER_INT; if so, it is equivalent to calling getLongValue() and then casting; except for possible overflow/underflow exception.

Note: if the value falls outside of range of Java double, a JsonParseException will be thrown to indicate numeric overflow/underflow.

抛出:

IOException

JsonParseException

getDecimalValue

public abstract BigDecimal getDecimalValue()
                                    throws IOException,
                                           JsonParseException

Numeric accessor that can be called when the current token is of type JsonToken.VALUE_NUMBER_FLOAT or JsonToken.VALUE_NUMBER_INT. No under/overflow exceptions are ever thrown.

抛出:

IOException

JsonParseException

getBooleanValue

public boolean getBooleanValue()
                        throws IOException,
                               JsonParseException

Convenience accessor that can be called when the current token is JsonToken.VALUE_TRUE or JsonToken.VALUE_FALSE.

Note: if the token is not of above-mentioned boolean types, an integer, but its value falls outside of range of Java long, a JsonParseException may be thrown to indicate numeric overflow/underflow.

抛出:

IOException

JsonParseException

从以下版本开始:

1.3

getEmbeddedObject

public Object getEmbeddedObject()
                         throws IOException,
                                JsonParseException

Accessor that can be called if (and only if) the current token is JsonToken.VALUE_EMBEDDED_OBJECT. For other token types, null is returned.

Note: only some specialized parser implementations support embedding of objects (usually ones that are facades on top of non-streaming sources, such as object trees).

抛出:

IOException

JsonParseException

从以下版本开始:

1.3

getBinaryValue

public abstract byte[] getBinaryValue(Base64Variant b64variant)
                               throws IOException,
                                      JsonParseException

Method that can be used to read (and consume -- results may not be accessible using other methods after the call) base64-encoded binary data included in the current textual JSON value. It works similar to getting String value via getText() and decoding result (except for decoding part), but should be significantly more performant.

Note that non-decoded textual contents of the current token are not guaranteed to be accessible after this method is called. Current implementation, for example, clears up textual content during decoding. Decoded binary content, however, will be retained until parser is advanced to the next event.

参数:

b64variant - Expected variant of base64 encoded content (see Base64Variants for definitions of "standard" variants).

返回:

Decoded binary data

抛出:

IOException

JsonParseException

getBinaryValue

public byte[] getBinaryValue()
                      throws IOException,
                             JsonParseException

Convenience alternative to getBinaryValue(Base64Variant) that defaults to using Base64Variants.getDefaultVariant() as the default encoding.

抛出:

IOException

JsonParseException

getValueAsInt

public int getValueAsInt()
                  throws IOException,
                         JsonParseException

Method that will try to convert value of current token to a int. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.

If representation can not be converted to an int (including structured type markers like start/end Object/Array) default value of 0 will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.6

getValueAsInt

public int getValueAsInt(int defaultValue)
                  throws IOException,
                         JsonParseException

Method that will try to convert value of current token to a int. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.

If representation can not be converted to an int (including structured type markers like start/end Object/Array) specified defaultValue will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.6

getValueAsLong

public long getValueAsLong()
                    throws IOException,
                           JsonParseException

Method that will try to convert value of current token to a long. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.

If representation can not be converted to an int (including structured type markers like start/end Object/Array) default value of 0 will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.6

getValueAsLong

public long getValueAsLong(long defaultValue)
                    throws IOException,
                           JsonParseException

Method that will try to convert value of current token to a long. Numbers are coerced using default Java rules; booleans convert to 0 (false) and 1 (true), and Strings are parsed using default Java language integer parsing rules.

If representation can not be converted to an int (including structured type markers like start/end Object/Array) specified defaultValue will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.6

getValueAsDouble

public double getValueAsDouble()
                        throws IOException,
                               JsonParseException

Method that will try to convert value of current token to a Java double. Numbers are coerced using default Java rules; booleans convert to 0.0 (false) and 1.0 (true), and Strings are parsed using default Java language integer parsing rules.

If representation can not be converted to an int (including structured types like Objects and Arrays), default value of 0.0 will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.6

getValueAsDouble

public double getValueAsDouble(double defaultValue)
                        throws IOException,
                               JsonParseException

Method that will try to convert value of current token to a Java double. Numbers are coerced using default Java rules; booleans convert to 0.0 (false) and 1.0 (true), and Strings are parsed using default Java language integer parsing rules.

If representation can not be converted to an int (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.6

getValueAsBoolean

public boolean getValueAsBoolean()
                          throws IOException,
                                 JsonParseException

Method that will try to convert value of current token to a boolean. JSON booleans map naturally; integer numbers other than 0 map to true, and 0 maps to false and Strings 'true' and 'false' map to corresponding values.

If representation can not be converted to a boolean value (including structured types like Objects and Arrays), default value of false will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.7

getValueAsBoolean

public boolean getValueAsBoolean(boolean defaultValue)
                          throws IOException,
                                 JsonParseException

Method that will try to convert value of current token to a boolean. JSON booleans map naturally; integer numbers other than 0 map to true, and 0 maps to false and Strings 'true' and 'false' map to corresponding values.

If representation can not be converted to a boolean value (including structured types like Objects and Arrays), specified defaultValue will be returned; no exceptions are thrown.

抛出:

IOException

JsonParseException

从以下版本开始:

1.7

readValueAs

public <T> T readValueAs(Class<T> valueType)
              throws IOException,
                     JsonProcessingException

Method to deserialize JSON content into a non-container type (it can be an array type, however): typically a bean, array or a wrapper type (like Boolean). Note: method can only be called if the parser has an object codec assigned; this is true for parsers constructed by MappingJsonFactory but not for JsonFactory (unless its setCodec method has been explicitly called).

This method may advance the event stream, for structured types the current token will be the closing end marker (END_ARRAY, END_OBJECT) of the bound structure. For non-structured Json types (and for JsonToken.VALUE_EMBEDDED_OBJECT) stream is not advanced.

Note: this method should NOT be used if the result type is a container (Collection or Map. The reason is that due to type erasure, key and value types can not be introspected when using this method.

抛出:

IOException

JsonProcessingException

readValueAs

public <T> T readValueAs(TypeReference<?> valueTypeRef)
              throws IOException,
                     JsonProcessingException

Method to deserialize JSON content into a Java type, reference to which is passed as argument. Type is passed using so-called "super type token" and specifically needs to be used if the root type is a parameterized (generic) container type. Note: method can only be called if the parser has an object codec assigned; this is true for parsers constructed by MappingJsonFactory but not for JsonFactory (unless its setCodec method has been explicitly called).

This method may advance the event stream, for structured types the current token will be the closing end marker (END_ARRAY, END_OBJECT) of the bound structure. For non-structured Json types (and for JsonToken.VALUE_EMBEDDED_OBJECT) stream is not advanced.

抛出:

IOException

JsonProcessingException

readValuesAs

public <T> Iterator<T> readValuesAs(Class<T> valueType)
                         throws IOException,
                                JsonProcessingException

Method for reading sequence of Objects from parser stream, all with same specified value type.

抛出:

IOException

JsonProcessingException

从以下版本开始:

1.9

readValuesAs

public <T> Iterator<T> readValuesAs(TypeReference<?> valueTypeRef)
                         throws IOException,
                                JsonProcessingException

Method for reading sequence of Objects from parser stream, all with same specified value type.

抛出:

IOException

JsonProcessingException

从以下版本开始:

1.9

readValueAsTree

public JsonNode readValueAsTree()
                         throws IOException,
                                JsonProcessingException

Method to deserialize JSON content into equivalent "tree model", represented by root JsonNode of resulting model. For JSON Arrays it will an array node (with child nodes), for objects object node (with child nodes), and for other types matching leaf node type

抛出:

IOException

JsonProcessingException

_constructError

protected JsonParseException _constructError(String msg)

Helper method for constructing JsonParseExceptions based on current state of the parser