java.lang.Object java.io.Reader java.io.InputStreamReader
An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset . The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.
Each invocation of one of an InputStreamReader's read() methods may cause one or more bytes to be read from the underlying byte-input stream. To enable the efficient conversion of bytes to characters, more bytes may be read ahead from the underlying stream than are necessary to satisfy the current read operation.
For top efficiency, consider wrapping an InputStreamReader within a BufferedReader. For example:
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
Field Summary |
---|
Fields inherited from class java.io. Reader |
---|
lock |
Constructor Summary | |
---|---|
InputStreamReader
(
InputStream
in) Create an InputStreamReader that uses the default charset. |
|
InputStreamReader
(
InputStream
in,
Charset
cs) Create an InputStreamReader that uses the given charset. |
|
InputStreamReader
(
InputStream
in,
CharsetDecoder
dec) Create an InputStreamReader that uses the given charset decoder. |
|
InputStreamReader
(
InputStream
in,
String
charsetName) Create an InputStreamReader that uses the named charset. |
Method Summary | |
---|---|
void |
close
() Close the stream. |
String |
getEncoding
() Return the name of the character encoding being used by this stream. |
int |
read
() Read a single character. |
int |
read
(char[] cbuf, int offset, int length) Read characters into a portion of an array. |
boolean |
ready
() Tell whether this stream is ready to be read. |
Methods inherited from class java.io. Reader |
---|
mark , markSupported , read , read , reset , skip |
Methods inherited from class java.lang. Object |
---|
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
Constructor Detail |
---|
public InputStreamReader(InputStream in)
public InputStreamReader(InputStream in, String charsetName) throws UnsupportedEncodingException
public InputStreamReader(InputStream in, Charset cs)
public InputStreamReader(InputStream in, CharsetDecoder dec)
Method Detail |
---|
public String getEncoding()
If the encoding has an historical name then that name is returned; otherwise the encoding's canonical name is returned.
If this instance was created with the InputStreamReader(InputStream, String) constructor then the returned name, being unique for the encoding, may differ from the name passed to the constructor. This method may return null if the stream has been closed.
public int read() throws IOException
public int read(char[] cbuf, int offset, int length) throws IOException
public boolean ready() throws IOException
public void close() throws IOException