java.lang.Object | ||
↳ | java.io.Reader | |
↳ | java.io.InputStreamReader |
Known Direct Subclasses |
A class for turning a byte stream into a character stream. Data read from the
source input stream is converted into characters by either a default or a
provided character converter. The default encoding is taken from the
"file.encoding" system property. InputStreamReader
contains a buffer
of bytes read from the source stream and converts these into characters as
needed. The buffer size is 8K.
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Inherited Fields | |||||||||||
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From class
java.io.Reader
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Public Constructors | |||||||||||
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Constructs a new InputStreamReader on the InputStream
in . | |||||||||||
Constructs a new InputStreamReader on the InputStream
in and
CharsetDecoder dec . | |||||||||||
Constructs a new InputStreamReader on the InputStream
in and
Charset charset . |
Public Methods | |||||||||||
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Closes this reader.
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Returns the name of the encoding used to convert bytes into characters.
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Reads a single character from this reader and returns it as an integer
with the two higher-order bytes set to 0.
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Reads at most
length characters from this reader and stores them
at position offset in the character array buf . | |||||||||||
Indicates whether this reader is ready to be read without blocking.
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Inherited Methods | |||||||||||
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From class java.io.Reader
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From class java.lang.Object
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From interface java.io.Closeable
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From interface java.lang.Readable
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Constructs a new InputStreamReader
on the InputStream
in
. This constructor sets the character converter to the encoding
specified in the "file.encoding" property and falls back to ISO 8859_1
(ISO-Latin-1) if the property doesn't exist.
in | the input stream from which to read characters. |
---|
Constructs a new InputStreamReader on the InputStream in
. The
character converter that is used to decode bytes into characters is
identified by name by enc
. If the encoding cannot be found, an
UnsupportedEncodingException error is thrown.
in | the InputStream from which to read characters. |
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enc | identifies the character converter to use. |
NullPointerException | if enc is null . |
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UnsupportedEncodingException | if the encoding specified by enc cannot be found.
|
Constructs a new InputStreamReader on the InputStream in
and
CharsetDecoder dec
.
in | the source InputStream from which to read characters. |
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dec | the CharsetDecoder used by the character conversion. |
Constructs a new InputStreamReader on the InputStream in
and
Charset charset
.
in | the source InputStream from which to read characters. |
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charset | the Charset that defines the character converter |
Closes this reader. This implementation closes the source InputStream and releases all local storage.
IOException | if an error occurs attempting to close this reader. |
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Returns the name of the encoding used to convert bytes into characters.
The value null
is returned if this reader has been closed.
null
if this
reader is closed.
Reads a single character from this reader and returns it as an integer with the two higher-order bytes set to 0. Returns -1 if the end of the reader has been reached. The byte value is either obtained from converting bytes in this reader's buffer or by first filling the buffer from the source InputStream and then reading from the buffer.
IOException | if this reader is closed or some other I/O error occurs. |
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Reads at most length
characters from this reader and stores them
at position offset
in the character array buf
. Returns
the number of characters actually read or -1 if the end of the reader has
been reached. The bytes are either obtained from converting bytes in this
reader's buffer or by first filling the buffer from the source
InputStream and then reading from the buffer.
buffer | the array to store the characters read. |
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offset | the initial position in buf to store the characters
read from this reader. |
length | the maximum number of characters to read. |
IndexOutOfBoundsException | if offset < 0 or length < 0 , or if
offset + length is greater than the length of
buf . |
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IOException | if this reader is closed or some other I/O error occurs. |
Indicates whether this reader is ready to be read without blocking. If
the result is true
, the next read()
will not block. If
the result is false
then this reader may or may not block when
read()
is called. This implementation returns true
if
there are bytes available in the buffer or the source stream has bytes
available.
true
if the receiver will not block when read()
is called, false
if unknown or blocking will occur.IOException | if this reader is closed or some other I/O error occurs. |
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