public interface BytesMessage extends Message
BytesMessage
object is used to send a message containing a
stream of uninterpreted bytes. It inherits from the Message
interface and adds a bytes
message body. The receiver of the message supplies the interpretation
of the bytes.
The BytesMessage
methods are based largely on those found in
java.io.DataInputStream
and
java.io.DataOutputStream
.
This message type is for client encoding of existing message formats. If possible, one of the other self-defining message types should be used instead.
Although the JMS API allows the use of message properties with byte messages, they are typically not used, since the inclusion of properties may affect the format.
The primitive types can be written explicitly using methods
for each type. They may also be written generically as objects.
For instance, a call to BytesMessage.writeInt(6)
is
equivalent to BytesMessage.writeObject(new Integer(6))
.
Both forms are provided, because the explicit form is convenient for
static programming, and the object form is needed when types are not known
at compile time.
When the message is first created, and when clearBody
is called, the body of the message is in write-only mode. After the
first call to reset
has been made, the message body is in
read-only mode.
After a message has been sent, the client that sent it can retain and
modify it without affecting the message that has been sent. The same message
object can be sent multiple times.
When a message has been received, the provider has called
reset
so that the message body is in read-only mode for the client.
If clearBody
is called on a message in read-only mode,
the message body is cleared and the message is in write-only mode.
If a client attempts to read a message in write-only mode, a
MessageNotReadableException
is thrown.
If a client attempts to write a message in read-only mode, a
MessageNotWriteableException
is thrown.
Session.createBytesMessage()
,
MapMessage
,
Message
,
ObjectMessage
,
StreamMessage
,
TextMessage
DEFAULT_DELIVERY_DELAY, DEFAULT_DELIVERY_MODE, DEFAULT_PRIORITY, DEFAULT_TIME_TO_LIVE
Modifier and Type | Method and Description |
---|---|
long |
getBodyLength()
Gets the number of bytes of the message body when the message
is in read-only mode.
|
boolean |
readBoolean()
Reads a
boolean from the bytes message stream. |
byte |
readByte()
Reads a signed 8-bit value from the bytes message stream.
|
int |
readBytes(byte[] value)
Reads a byte array from the bytes message stream.
|
int |
readBytes(byte[] value,
int length)
Reads a portion of the bytes message stream.
|
char |
readChar()
Reads a Unicode character value from the bytes message stream.
|
double |
readDouble()
Reads a
double from the bytes message stream. |
float |
readFloat()
Reads a
float from the bytes message stream. |
int |
readInt()
Reads a signed 32-bit integer from the bytes message stream.
|
long |
readLong()
Reads a signed 64-bit integer from the bytes message stream.
|
short |
readShort()
Reads a signed 16-bit number from the bytes message stream.
|
int |
readUnsignedByte()
Reads an unsigned 8-bit number from the bytes message stream.
|
int |
readUnsignedShort()
Reads an unsigned 16-bit number from the bytes message stream.
|
String |
readUTF()
Reads a string that has been encoded using a modified UTF-8
format from the bytes message stream.
|
void |
reset()
Puts the message body in read-only mode and repositions the stream of
bytes to the beginning.
|
void |
writeBoolean(boolean value)
Writes a
boolean to the bytes message stream as a 1-byte
value. |
void |
writeByte(byte value)
Writes a
byte to the bytes message stream as a 1-byte
value. |
void |
writeBytes(byte[] value)
Writes a byte array to the bytes message stream.
|
void |
writeBytes(byte[] value,
int offset,
int length)
Writes a portion of a byte array to the bytes message stream.
|
void |
writeChar(char value)
Writes a
char to the bytes message stream as a 2-byte
value, high byte first. |
void |
writeDouble(double value)
Converts the
double argument to a long using
the
doubleToLongBits method in class Double ,
and then writes that long value to the bytes message
stream as an 8-byte quantity, high byte first. |
void |
writeFloat(float value)
Converts the
float argument to an int using
the
floatToIntBits method in class Float ,
and then writes that int value to the bytes message
stream as a 4-byte quantity, high byte first. |
void |
writeInt(int value)
Writes an
int to the bytes message stream as four bytes,
high byte first. |
void |
writeLong(long value)
Writes a
long to the bytes message stream as eight bytes,
high byte first. |
void |
writeObject(Object value)
Writes an object to the bytes message stream.
|
void |
writeShort(short value)
Writes a
short to the bytes message stream as two bytes,
high byte first. |
void |
writeUTF(String value)
Writes a string to the bytes message stream using UTF-8 encoding in a
machine-independent manner.
|
acknowledge, clearBody, clearProperties, getBody, getBooleanProperty, getByteProperty, getDoubleProperty, getFloatProperty, getIntProperty, getJMSCorrelationID, getJMSCorrelationIDAsBytes, getJMSDeliveryMode, getJMSDeliveryTime, getJMSDestination, getJMSExpiration, getJMSMessageID, getJMSPriority, getJMSRedelivered, getJMSReplyTo, getJMSTimestamp, getJMSType, getLongProperty, getObjectProperty, getPropertyNames, getShortProperty, getStringProperty, isBodyAssignableTo, propertyExists, setBooleanProperty, setByteProperty, setDoubleProperty, setFloatProperty, setIntProperty, setJMSCorrelationID, setJMSCorrelationIDAsBytes, setJMSDeliveryMode, setJMSDeliveryTime, setJMSDestination, setJMSExpiration, setJMSMessageID, setJMSPriority, setJMSRedelivered, setJMSReplyTo, setJMSTimestamp, setJMSType, setLongProperty, setObjectProperty, setShortProperty, setStringProperty
long getBodyLength() throws JMSException
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageNotReadableException
- if the message is in write-only
mode.boolean readBoolean() throws JMSException
boolean
from the bytes message stream.boolean
value readJMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.byte readByte() throws JMSException
byte
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.int readUnsignedByte() throws JMSException
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.short readShort() throws JMSException
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.int readUnsignedShort() throws JMSException
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.char readChar() throws JMSException
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.int readInt() throws JMSException
int
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.long readLong() throws JMSException
long
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.float readFloat() throws JMSException
float
from the bytes message stream.float
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.double readDouble() throws JMSException
double
from the bytes message stream.double
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.String readUTF() throws JMSException
For more information on the UTF-8 format, see "File System Safe UCS Transformation Format (FSS_UTF)", X/Open Preliminary Specification, X/Open Company Ltd., Document Number: P316. This information also appears in ISO/IEC 10646, Annex P.
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageEOFException
- if unexpected end of bytes stream has
been reached.MessageNotReadableException
- if the message is in write-only
mode.int readBytes(byte[] value) throws JMSException
If the length of array value
is less than the number of
bytes remaining to be read from the stream, the array should
be filled. A subsequent call reads the next increment, and so on.
If the number of bytes remaining in the stream is less than the
length of
array value
, the bytes should be read into the array.
The return value of the total number of bytes read will be less than
the length of the array, indicating that there are no more bytes left
to be read from the stream. The next read of the stream returns -1.
value
- the buffer into which the data is readJMSException
- if the JMS provider fails to read the message
due to some internal error.MessageNotReadableException
- if the message is in write-only
mode.int readBytes(byte[] value, int length) throws JMSException
If the length of array value
is less than the number of
bytes remaining to be read from the stream, the array should
be filled. A subsequent call reads the next increment, and so on.
If the number of bytes remaining in the stream is less than the
length of
array value
, the bytes should be read into the array.
The return value of the total number of bytes read will be less than
the length of the array, indicating that there are no more bytes left
to be read from the stream. The next read of the stream returns -1.
If length
is negative, or
length
is greater than the length of the array
value
, then an IndexOutOfBoundsException
is
thrown. No bytes will be read from the stream for this exception case.
value
- the buffer into which the data is readlength
- the number of bytes to read; must be less than or equal to
value.length
JMSException
- if the JMS provider fails to read the message
due to some internal error.MessageNotReadableException
- if the message is in write-only
mode.void writeBoolean(boolean value) throws JMSException
boolean
to the bytes message stream as a 1-byte
value.
The value true
is written as the value
(byte)1
; the value false
is written as
the value (byte)0
.value
- the boolean
value to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeByte(byte value) throws JMSException
byte
to the bytes message stream as a 1-byte
value.value
- the byte
value to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeShort(short value) throws JMSException
short
to the bytes message stream as two bytes,
high byte first.value
- the short
to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeChar(char value) throws JMSException
char
to the bytes message stream as a 2-byte
value, high byte first.value
- the char
value to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeInt(int value) throws JMSException
int
to the bytes message stream as four bytes,
high byte first.value
- the int
to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeLong(long value) throws JMSException
long
to the bytes message stream as eight bytes,
high byte first.value
- the long
to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeFloat(float value) throws JMSException
float
argument to an int
using
the
floatToIntBits
method in class Float
,
and then writes that int
value to the bytes message
stream as a 4-byte quantity, high byte first.value
- the float
value to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeDouble(double value) throws JMSException
double
argument to a long
using
the
doubleToLongBits
method in class Double
,
and then writes that long
value to the bytes message
stream as an 8-byte quantity, high byte first.value
- the double
value to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeUTF(String value) throws JMSException
For more information on the UTF-8 format, see "File System Safe UCS Transformation Format (FSS_UTF)", X/Open Preliminary Specification, X/Open Company Ltd., Document Number: P316. This information also appears in ISO/IEC 10646, Annex P.
value
- the String
value to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeBytes(byte[] value) throws JMSException
value
- the byte array to be writtenJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeBytes(byte[] value, int offset, int length) throws JMSException
value
- the byte array value to be writtenoffset
- the initial offset within the byte arraylength
- the number of bytes to useJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageNotWriteableException
- if the message is in read-only
mode.void writeObject(Object value) throws JMSException
This method works only for the objectified primitive
object types (Integer
, Double
,
Long
...), String
objects, and byte
arrays.
value
- the object in the Java programming language ("Java
object") to be written; it must not be nullJMSException
- if the JMS provider fails to write the message
due to some internal error.MessageFormatException
- if the object is of an invalid type.MessageNotWriteableException
- if the message is in read-only
mode.NullPointerException
- if the parameter
value
is null.void reset() throws JMSException
JMSException
- if the JMS provider fails to reset the message
due to some internal error.MessageFormatException
- if the message has an invalid
format.Copyright © 2017 JBoss by Red Hat. All rights reserved.