Java byte stream and character stream

For our common GBK Chinese and English is occupied by a byte, in Chinese, 2 for UTF-8, English is one, in Chinese, 3 for Unicode, English and Chinese are two operations on Java's stream byte stream and character stream for the two. 1, byte stream read operations are all inherited from a common super class java.io.InputStream class. All write operations are inherited from one ...

GBK in our common English, it is occupied by a byte, in Chinese 2

For UTF-8, English is one, in Chinese, 3

For Unicode, English and Chinese are two

Java's current operations are divided into two kinds of byte stream and character stream.

1, a byte stream

All read operations are inherited from a common super class java.io.InputStream class.

All write operations are inherited from a common super class java.io.OutputStream class.

InputStream and OutputStream are abstract classes.

InputStream has six low-level input stream:

Low flow

The use of flow

ByteArrayInputStream

Read data from memory array of bytes

FileInputStream

From the local file system to read data byte

PipedInputStream

Pipeline from the thread to read data byte

StringBufferInputStream

Read data byte from a string

SequenceInputStream

Low-level flow from two or more data bytes to read, when the reach the end of the stream flow from one to another stream

System.in

Read data byte from the user console

There is also a subclass of InputStream: filter flow java.io.FilterInputStream. Filter stream that can wrap up the basic flow, provide more convenient usage.

FilterInputStream class constructor for the FilterInputStream (InputStream), on the specified input stream, create an input stream filter.

Common FilterInputStream subclass as follows:

Filter input stream

The use of flow

BufferedInputStream

Buffer access to data to improve efficiency

DataInputStream

Read from the input stream of basic data types, such as int, float, double, or even one line of text

LineNumberInputStream

In the translation of line endings, based on maintaining a counter that shows which line is being read.

PushbackInputStream

Pushed back to allow the data bytes to the stream of first

OutputStream (abbreviated)

The structure of OutputStream and InputStream is the same.

2, the character stream

Note: It is introduced in jdk1.1 inside, above the byte stream is introduced in jdk1.0. When used to process text data, select the character stream better than the byte stream. But the basic data types only way developers can continue to use the byte stream.

All read operations are inherited from a common super class java.io.Reader class.

All write operations are inherited from a common super class java.io.Writer class.

Reader and Writer is the same abstract class.

Reader's common subclass as follows:

Low-level reader

The use of flow

CharArrayReader

Read data from a character array

InputStreamReader

FileReader (InputStreamReader sub-category)

From the local file system, a sequence of characters to read

StringReader

Read a sequence of characters from the string

PipedReader

Pipeline from the thread to read a sequence of characters

InputStreamReader highlight:

InputStreamReader to read from the input data stream, the connection input stream on the reader. Such as:

new InputStreamReader (System.in)

Constructor:

InputStreamReader (InputStream)

Use the default character encoding, create a InputStreamReader.

InputStreamReader (InputStream, String)

With a named character encoding, create a InputStreamReader.

Commonly used filters reader:

Filter reader

The use of flow

BufferedReader

Buffered data access, to improve efficiency

LineNumberReader (BufferedReader sub-category)

Maintains a counter that shows which line is being read.

FilterReader (abstract class)

Create a filter to provide a class can extend this class

PushbackReader (FilterReader sub-category)

Pushed back to allow the text data stream reader

These filters reader can pass a Reader as a constructor parameter.

Writer (abbreviated)

The structure of Writer and Reader are the same.

Byte stream is the most basic, the characters flow in order to deal with characters of their argument.

new BufferedReader (new InputStreamReader (client.getInputStream ())); explained:

client.getInputStream () is a byte stream;

InputStreamReader stream the byte stream into characters;

BufferedReader buffered character stream, makes it possible to use the readline () and other methods to read a line directly.