I/O流

OutputStream类型:

Subclasses:

ByteArrayOutputStream, FileOutputStream, FilterOutputStream, ObjectOutputStream, OutputStream, PipedOutputStream

void	close() Closes this output stream and releases any system resources associated with this stream.
void	flush() Flushes this output stream and forces any buffered output bytes to be written out.
void	write(byte[] b) Writes b.length bytes from the specified byte array to this output stream.
void	write(byte[] b, int off, int len) Writes len bytes from the specified byte array starting at offset off to this output stream.
abstract void	write(int b) Writes the specified byte to this output stream.

 FileOutputStream构造器：

FileOutputStream(File file)

Creates a file output stream to write to the file represented by the specified File object.

FileOutputStream(File file, boolean append)

Creates a file output stream to write to the file represented by the specified File object.

FileOutputStream(FileDescriptor fdObj)

Creates a file output stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system.

FileOutputStream(String name)

Creates a file output stream to write to the file with the specified name.

FileOutputStream(String name, boolean append)

Creates a file output stream to write to the file with the specified name.

InputStream类型:

int	available() Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.
void	close() Closes this input stream and releases any system resources associated with the stream.
void	mark(int readlimit) Marks the current position in this input stream.
boolean	markSupported() Tests if this input stream supports the mark and reset methods.
abstract int	read() Reads the next byte of data from the input stream.
int	read(byte[] b) Reads some number of bytes from the input stream and stores them into the buffer array b.
int	read(byte[] b, int off, int len) Reads up to len bytes of data from the input stream into an array of bytes.
void	reset() Repositions this stream to the position at the time the mark method was last called on this input stream.
long	skip(long n) Skips over and discards n bytes of data from this input stream.

FileInputStream构造器：

FileInputStream(File file)

Creates a FileInputStream by opening a connection to an actual file, the file named by the File object file in the file system.

FileInputStream(FileDescriptor fdObj)

Creates a FileInputStream by using the file descriptor fdObj, which represents an existing connection to an actual file in the file system.

FileInputStream(String name)

Writer 类：

public abstract class Writer extends Object implements Appendable, Closeable, Flushable

Writer	append(char c) Appends the specified character to this writer.
Writer	append(CharSequence csq) Appends the specified character sequence to this writer.
Writer	append(CharSequence csq, int start, int end) Appends a subsequence of the specified character sequence to this writer.
abstract void	close() Closes the stream, flushing it first.
abstract void	flush() Flushes the stream.
void	write(char[] cbuf) Writes an array of characters.
abstract void	write(char[] cbuf, int off, int len) Writes a portion of an array of characters.
void	write(int c) Writes a single character.
void	write(String str) Writes a string.
void	write(String str, int off, int len) Writes a portion of a string.