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javax.jms Interface MapMessage
- All Superinterfaces:
- Message
public interface MapMessage
- extends Message
MapMessage
对象用于发送一组名称-值对。名称是 String
对象,值是 Java 编程语言中的基本数据类型。名称必须有一个不为 null 的值,并且不能是空字符串。可以根据名称按顺序或随机访问这些条目。条目的顺序是不确定的。MapMessage
继承自 Message
接口并添加了包含 Map 的消息正文。
可以使用用于每种类型的方法显式读取或写入基本类型。它们通常也能作为对象读取或写入。例如,对 MapMessage.setInt("foo", 6)
的调用等效于 MapMessage.setObject("foo", new Integer(6))
。这两种形式都提供,因为显式形式对于静态编程很方便,而编译期间类型未知时需要对象形式。
当客户端接收 MapMessage
时,它是只读模式。如果客户端尝试在此时写入消息,则抛出 MessageNotWriteableException
。如果调用了 clearBody
,现在便可以读取和写入消息。
MapMessage
对象支持下面的转换表。必须支持标记的情况。未标记的情况必须抛出 JMSException
。如果基本类型的 valueOf()
方法不接受它作为有效的基本类型 String
表示形式,则 String
到基本类型的转换可能抛出运行时异常。
作为行类型写入的值可以作为列类型读取。
| | boolean byte short char int long float double String byte[] |---------------------------------------------------------------------- |boolean | X X |byte | X X X X X |short | X X X X |char | X X |int | X X X |long | X X |float | X X X |double | X X |String | X X X X X X X X |byte[] | X |----------------------------------------------------------------------
尝试将 null 值作为基本类型读取将视同于调用基本类型相应的具有 null 值的 valueOf(String)
转换方法。由于 char
不支持 String
转换,尝试将 null 值作为 char
读取必然抛出 NullPointerException
。
version |
| |
See also | createMapMessage(), javax.jms.BytesMessage, javax.jms.Message, javax.jms.ObjectMessage, javax.jms.StreamMessage, javax.jms.TextMessage |
A MapMessage
object is used to send a set of name-value pairs.
The names are String
objects, and the values are primitive
data types in the Java programming language. The names must have a value that
is not null, and not an empty string. The entries can be accessed
sequentially or randomly by name. The order of the entries is undefined.
MapMessage
inherits from the Message
interface
and adds a message body that contains a Map.
The primitive types can be read or written explicitly using methods
for each type. They may also be read or written generically as objects.
For instance, a call to MapMessage.setInt("foo", 6)
is
equivalent to MapMessage.setObject("foo", 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 a client receives a MapMessage
, it is in read-only
mode. If a client attempts to write to the message at this point, a
MessageNotWriteableException
is thrown. If
clearBody
is called, the message can now be both read from and
written to.
MapMessage
objects support the following conversion table.
The marked cases must be supported. The unmarked cases must throw a
JMSException
. The String
-to-primitive conversions
may throw a runtime exception if the primitive's valueOf()
method does not accept it as a valid String
representation of
the primitive.
A value written as the row type can be read as the column type.
| | boolean byte short char int long float double String byte[] |---------------------------------------------------------------------- |boolean | X X |byte | X X X X X |short | X X X X |char | X X |int | X X X |long | X X |float | X X X |double | X X |String | X X X X X X X X |byte[] | X |----------------------------------------------------------------------
Attempting to read a null value as a primitive type must be treated
as calling the primitive's corresponding valueOf(String)
conversion method with a null value. Since char
does not
support a String
conversion, attempting to read a null value
as a char
must throw a NullPointerException
.
- Version:
- 1.1 February 2, 002
- Author:
- Mark Hapner, Rich Burridge
- See Also:
Session.createMapMessage()
,BytesMessage
,Message
,ObjectMessage
,StreamMessage
,TextMessage
Field Summary |
---|
Fields inherited from interface javax.jms.Message |
---|
DEFAULT_DELIVERY_MODE, DEFAULT_PRIORITY, DEFAULT_TIME_TO_LIVE |
Method Summary | |
---|---|
boolean |
getBoolean(String name)
Returns the boolean value with the specified name. |
byte |
getByte(String name)
Returns the byte value with the specified name. |
byte[] |
getBytes(String name)
Returns the byte array value with the specified name. |
char |
getChar(String name)
Returns the Unicode character value with the specified name. |
double |
getDouble(String name)
Returns the double value with the specified name. |
float |
getFloat(String name)
Returns the float value with the specified name. |
int |
getInt(String name)
Returns the int value with the specified name. |
long |
getLong(String name)
Returns the long value with the specified name. |
Enumeration |
getMapNames()
Returns an Enumeration of all the names in the
MapMessage object. |
Object |
getObject(String name)
Returns the value of the object with the specified name. |
short |
getShort(String name)
Returns the short value with the specified name. |
String |
getString(String name)
Returns the String value with the specified name. |
boolean |
itemExists(String name)
Indicates whether an item exists in this MapMessage object. |
void |
setBoolean(String name,
boolean value)
Sets a boolean value with the specified name into the Map. |
void |
setByte(String name,
byte value)
Sets a byte value with the specified name into the Map. |
void |
setBytes(String name,
byte[] value)
Sets a byte array value with the specified name into the Map. |
void |
setBytes(String name,
byte[] value,
int offset,
int length)
Sets a portion of the byte array value with the specified name into the Map. |
void |
setChar(String name,
char value)
Sets a Unicode character value with the specified name into the Map. |
void |
setDouble(String name,
double value)
Sets a double value with the specified name into the Map. |
void |
setFloat(String name,
float value)
Sets a float value with the specified name into the Map. |
void |
setInt(String name,
int value)
Sets an int value with the specified name into the Map. |
void |
setLong(String name,
long value)
Sets a long value with the specified name into the Map. |
void |
setObject(String name,
Object value)
Sets an object value with the specified name into the Map. |
void |
setShort(String name,
short value)
Sets a short value with the specified name into the Map. |
void |
setString(String name,
String value)
Sets a String value with the specified name into the Map. |
Method Detail |
---|
public boolean
getBoolean(String name) throws JMSException
返回带指定名称的 boolean
值。
name |
boolean 的名称 |
return |
带指定名称的 boolean 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getBoolean
boolean getBoolean(String name) throws JMSException
- Returns the
boolean
value with the specified name. - Parameters:
name
- the name of theboolean
- Returns:
- the
boolean
value with the specified name - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public byte
getByte(String name) throws JMSException
返回带指定名称的 byte
值。
name |
byte 的名称 |
return |
带指定名称的 byte 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getByte
byte getByte(String name) throws JMSException
- Returns the
byte
value with the specified name. - Parameters:
name
- the name of thebyte
- Returns:
- the
byte
value with the specified name - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public short
getShort(String name) throws JMSException
返回带指定名称的 short
值。
name |
short 的名称 |
return |
带指定名称的 short 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getShort
short getShort(String name) throws JMSException
- Returns the
short
value with the specified name. - Parameters:
name
- the name of theshort
- Returns:
- the
short
value with the specified name - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public char
getChar(String name) throws JMSException
返回带指定名称的 Unicode 字符值。
name | Unicode 字符的名称 |
return | 带指定名称的 Unicode 字符值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getChar
char getChar(String name) throws JMSException
- Returns the Unicode character value with the specified name.
- Parameters:
name
- the name of the Unicode character- Returns:
- the Unicode character value with the specified name
- Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public int
getInt(String name) throws JMSException
返回带指定名称的 int
值。
name |
int 的名称 |
return |
带指定名称的 int 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getInt
int getInt(String name) throws JMSException
- Returns the
int
value with the specified name. - Parameters:
name
- the name of theint
- Returns:
- the
int
value with the specified name - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public long
getLong(String name) throws JMSException
返回带指定名称的 long
值。
name |
long 的名称 |
return |
带指定名称的 long 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getLong
long getLong(String name) throws JMSException
- Returns the
long
value with the specified name. - Parameters:
name
- the name of thelong
- Returns:
- the
long
value with the specified name - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public float
getFloat(String name) throws JMSException
返回带指定名称的 float
值。
name |
float 的名称 |
return |
带指定名称的 float 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getFloat
float getFloat(String name) throws JMSException
- Returns the
float
value with the specified name. - Parameters:
name
- the name of thefloat
- Returns:
- the
float
value with the specified name - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public double
getDouble(String name) throws JMSException
返回带指定名称的 double
值。
name |
double 的名称 |
return |
带指定名称的 double 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getDouble
double getDouble(String name) throws JMSException
- Returns the
double
value with the specified name. - Parameters:
name
- the name of thedouble
- Returns:
- the
double
value with the specified name - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public String
getString(String name) throws JMSException
返回带指定名称的 String
值。
name |
String 的名称 |
return |
带指定名称的 String 值;如果没有具有此名称的项,则返回 null 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getString
String getString(String name) throws JMSException
- Returns the
String
value with the specified name. - Parameters:
name
- the name of theString
- Returns:
- the
String
value with the specified name; if there is no item by this name, a null value is returned - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public byte[]
getBytes(String name) throws JMSException
返回带指定名称的 byte 数组值。
name | byte 数组的名称 |
return | 带指定名称的 byte 数组值的副本;如果没有具有此名称的项,则返回 null 值。 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
Throws | MessageFormatException: 如果此类型转换无效。 |
getBytes
byte[] getBytes(String name) throws JMSException
- Returns the byte array value with the specified name.
- Parameters:
name
- the name of the byte array- Returns:
- a copy of the byte array value with the specified name; if there is no item by this name, a null value is returned.
- Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.MessageFormatException
- if this type conversion is invalid.
public Object
getObject(String name) throws JMSException
返回带指定名称的对象值。
可以使用此方法(以对象化格式)返回 Java 编程语言中的对象(“Java 对象”),该对象已使用对等的 setObject
方法调用或其对等的基本 settype
方法存储在 Map 中。
注意,byte 值以 byte[]
的形式返回,而不是 Byte[]
。
name | Java 对象的名称 |
return |
带指定名称的 Java 对象值的副本,以对象化格式返回(例如,如果对象设置为 int ,则返回 Integer );如果没有具有此名称的项,则返回 null 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
getObject
Object getObject(String name) throws JMSException
- Returns the value of the object with the specified name.
This method can be used to return, in objectified format, an object in the Java programming language ("Java object") that had been stored in the Map with the equivalent
setObject
method call, or its equivalent primitivesettype
method.Note that byte values are returned as
byte[]
, notByte[]
. - Parameters:
name
- the name of the Java object- Returns:
- a copy of the Java object value with the specified name, in
objectified format (for example, if the object was set as an
int
, anInteger
is returned); if there is no item by this name, a null value is returned - Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.
public java.util.Enumeration<E>
getMapNames() throws JMSException
返回 MapMessage
对象中所有名称的 Enumeration
。
return |
此 MapMessage 中所有名称的枚举 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法读取消息。 |
getMapNames
Enumeration getMapNames() throws JMSException
- Returns an
Enumeration
of all the names in theMapMessage
object. - Returns:
- an enumeration of all the names in this
MapMessage
- Throws:
JMSException
- if the JMS provider fails to read the message due to some internal error.
public void
setBoolean(String name, boolean value) throws JMSException
将带指定名称的 boolean
值设置到 Map 中。
name |
boolean 的名称 |
value |
要在 Map 中设置的 boolean 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setBoolean
void setBoolean(String name, boolean value) throws JMSException
- Sets a
boolean
value with the specified name into the Map. - Parameters:
name
- the name of theboolean
value
- theboolean
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setByte(String name, byte value) throws JMSException
将带指定名称的 byte
值设置到 Map 中。
name |
byte 的名称 |
value |
要在 Map 中设置的 byte 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setByte
void setByte(String name, byte value) throws JMSException
- Sets a
byte
value with the specified name into the Map. - Parameters:
name
- the name of thebyte
value
- thebyte
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setShort(String name, short value) throws JMSException
将带指定名称的 short
值设置到 Map 中。
name |
short 的名称 |
value |
要在 Map 中设置的 short 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setShort
void setShort(String name, short value) throws JMSException
- Sets a
short
value with the specified name into the Map. - Parameters:
name
- the name of theshort
value
- theshort
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setChar(String name, char value) throws JMSException
将带指定名称的 Unicode 字符值设置到 Map 中。
name | Unicode 字符的名称 |
value | 要在 Map 中设置的 Unicode 字符值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setChar
void setChar(String name, char value) throws JMSException
- Sets a Unicode character value with the specified name into the Map.
- Parameters:
name
- the name of the Unicode charactervalue
- the Unicode character value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setInt(String name, int value) throws JMSException
将带指定名称的 int
值设置到 Map 中。
name |
int 的名称 |
value |
要在 Map 中设置的 int 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setInt
void setInt(String name, int value) throws JMSException
- Sets an
int
value with the specified name into the Map. - Parameters:
name
- the name of theint
value
- theint
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setLong(String name, long value) throws JMSException
将带指定名称的 long
值设置到 Map 中。
name |
long 的名称 |
value |
要在 Map 中设置的 long 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setLong
void setLong(String name, long value) throws JMSException
- Sets a
long
value with the specified name into the Map. - Parameters:
name
- the name of thelong
value
- thelong
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setFloat(String name, float value) throws JMSException
将带指定名称的 float
值设置到 Map 中。
name |
float 的名称 |
value |
要在 Map 中设置的 float 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setFloat
void setFloat(String name, float value) throws JMSException
- Sets a
float
value with the specified name into the Map. - Parameters:
name
- the name of thefloat
value
- thefloat
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setDouble(String name, double value) throws JMSException
将带指定名称的 double
值设置到 Map 中。
name |
double 的名称 |
value |
要在 Map 中设置的 double 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setDouble
void setDouble(String name, double value) throws JMSException
- Sets a
double
value with the specified name into the Map. - Parameters:
name
- the name of thedouble
value
- thedouble
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setString(String name, String value) throws JMSException
将带指定名称的 String
值设置到 Map 中。
name |
String 的名称 |
value |
要在 Map 中设置的 String 值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setString
void setString(String name, String value) throws JMSException
- Sets a
String
value with the specified name into the Map. - Parameters:
name
- the name of theString
value
- theString
value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setBytes(String name, byte[] value) throws JMSException
将带指定名称的 byte 数组值设置到 Map 中。
name | byte 数组的名称 |
value |
要在 Map 中设置的 byte 数组值;数组是复制的,因此,将不能通过以后修改来改变 name 的值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | NullPointerException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setBytes
void setBytes(String name, byte[] value) throws JMSException
- Sets a byte array value with the specified name into the Map.
- Parameters:
name
- the name of the byte arrayvalue
- the byte array value to set in the Map; the array is copied so that the value forname
will not be altered by future modifications- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.NullPointerException
- if the name is null, or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setBytes(String name, byte[] value, int offset, int length) throws JMSException
将带指定名称的 byte 数组值的一部分设置到 Map 中。
name | byte 数组的名称 |
value | 要在 Map 中设置的 byte 数组值 |
offset | byte 数组中的初始偏移量 |
length | 要使用的字节数 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setBytes
void setBytes(String name, byte[] value, int offset, int length) throws JMSException
- Sets a portion of the byte array value with the specified name into the
Map.
- Parameters:
name
- the name of the byte arrayvalue
- the byte array value to set in the Mapoffset
- the initial offset within the byte arraylength
- the number of bytes to use- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageNotWriteableException
- if the message is in read-only mode.
public void
setObject(String name, Object value) throws JMSException
将带指定名称的对象值设置到 Map 中。
此方法仅用于对象化的基本对象类型(Integer
、Double
、Long
等)、String
对象和 byte 数组。
name | Java 对象的名称 |
value | 要在 Map 中设置的 Java 对象值 |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法写入消息。 |
Throws | IllegalArgumentException: 如果名称为 null,或者名称为空字符串。 |
Throws | MessageFormatException: 如果对象无效。 |
Throws | MessageNotWriteableException: 如果消息是只读模式。 |
setObject
void setObject(String name, Object value) throws JMSException
- Sets an object value with the specified name into the Map.
This method works only for the objectified primitive object types (
Integer
,Double
,Long
...),String
objects, and byte arrays. - Parameters:
name
- the name of the Java objectvalue
- the Java object value to set in the Map- Throws:
JMSException
- if the JMS provider fails to write the message due to some internal error.IllegalArgumentException
- if the name is null or if the name is an empty string.MessageFormatException
- if the object is invalid.MessageNotWriteableException
- if the message is in read-only mode.
public boolean
itemExists(String name) throws JMSException
指示此 MapMessage
对象中是否存在某个项。
name | 要测试的项的名称 |
return | 如果存在该项,则返回 true |
Throws | JMSException: 如果 JMS 提供者由于某个内部错误无法确定是否存在该项。 |
itemExists
boolean itemExists(String name) throws JMSException
- Indicates whether an item exists in this
MapMessage
object. - Parameters:
name
- the name of the item to test- Returns:
- true if the item exists
- Throws:
JMSException
- if the JMS provider fails to determine if the item exists due to some internal error.
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