Java 中的 inputstream inputstreamreader 阅读器
inputteam每次读取一个字节，而inputstreamreader可以将byte转换为characher，然后每次读取一个字符，而reader每次也读取一个字符，那么它们之间有什么区别呢？
inputsteam reads a byte each time, and inputstreamreader can convert byte to characher, and then reads a character each time, and reader also reads a character each time, so what is the difference between them?
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InputStreamReader处理编码。字符并不总是适合byte（8 位），并且字节值并不总是映射到相同的字符，例如 javachar使用 16 位来编码字符这使得可以表示更多数量的不同字符。根据输入流的源，字符可以使用 ASCII（1 字节）、UTF-8（1 或更多字节）、UTF-16（2 或 4 字节）、utf-32（4 字节）或任何其他现有的编码编码。给定正确的字符集，读者可以将原始字节转换为相应的 java 字符。
The
InputStreamReaderhandles the encoding. A character does not always fit into abyte(8bit) and the byte value does not always map to the same char, the javacharfor example uses 16bit to encode a character which makes it possible to represent a greater number of different characters.Depending on the source of the InputStream a character may be encoded with ASCII(1 byte), UTF-8(1 or more byte), UTF-16(2 or 4 byte), utf-32(4 byte) or any other existing encoding. Given the right Charset a Reader can convert the raw bytes into the corresponding java character.
来自 JavaDocs：
输入流：
这个抽象类是表示字节输入流的所有类的超类
Input Stream Reader：
从字节流到字符流的桥梁：它读取字节并使用指定的字符集将它们解码为字符。
流只是为您提供原始字节，读取器可以将原始字节转换为不同编码（ASCII / ISO / UTF）的字符。
http://download.oracle.com/javase/6 /docs/api/java/io/InputStream.html
http://download.oracle.com/javase/6/docs/api/java/io/InputStreamReader.html
http://download.oracle.com/javase /6/docs/api/java/nio/charset/Charset.html
From the JavaDocs:
Input Stream:
This abstract class is the superclass of all classes representing an input stream of bytes
Input Stream Reader:
a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset
The stream just gives you the raw bytes, the reader can convert the raw bytes into characters for different encodings (ASCII/ISO/UTF).
http://download.oracle.com/javase/6/docs/api/java/io/InputStream.html
http://download.oracle.com/javase/6/docs/api/java/io/InputStreamReader.html
http://download.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html
InputStreamReader 是抽象类 Reader 的实现，它从 InputStream 读取字符，根据给定的字符集转换字节。 Reader 还有其他实现，例如 StringReader，它从字符串返回字符，不需要任何字符集转换。
InputStreamReader is an implementation of the abstract class Reader that reads character from an InputStream, converting bytes according to a given charset. There are other implementations of Reader too, for example StringReader which return character from a string and does not need any charset conversion.