java.io 对字节流和字符流的讨论[zz]

原文出处：http://www.javaeye.com/topic/175121

（最好到上面的原文地址去看，代码有格式）

个人总结：

//输入流常用接口和类---->>

//字节流(字符流)抽象接口
InputStream inputStream;
Reader reader;
//字节流(字符流)具体实现类
FileInputStream fileInputStream;
FileReader fileReader;
//字节流向字符流转换
InputStreamReader inputStreamReader;
//缓存字节流(字符流)
BufferedInputStream bufferedInputStream;
BufferedReader bufferedReader;
//输出流常用接口和类---->>
OutputStream outputStream;
Writer writer;

FileOutputStream fileOutputStream;
FileWriter fileWriter;

OutputStreamWriter outputStreamWriter;

BufferedOutputStream bufferedOutputStream;
BufferedWriter bufferedWriter;

一直对字节流、字符流糊糊涂涂，这篇文章写的很好，一定要细读。

IO分两种流

字节流 InputStream OutputStream

字符流 Reader Writer

他们都是抽象类

具体实现
字节流 FileInputStream FileOutputStream
字符流 FileReader FileWriter

字节流转换成字符流可以用 InputSteamReader OutputStreamWriter

转换成BufferdReader BufferedWriter 他们具有缓冲区

例如：读取文件 从字节流输入到字符流输入
定义一个字节流：

//Java代码
FileInputStream fileInputStream = new FileInputStream("d:/text.txt");  // 定义一个指向D:/TEXT.TXT 的字节流

InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
//字节流转换成InputStreamReader

BufferedReader bufferedReader = new BufferedReader(inputSteamReader);
//InputStreamReader 转换成带缓存的bufferedReader

可以把读出来的内容赋值给字符

//Java代码
String ss = new String();
String s;
while((s = bufferedReader.readLine())!=null){
ss += s;
}

例如：写入文件 从字节流输出到字符流输出

//Java代码
FileOutputStream fileOutputStream = new FileOutputStream("d:/text.txt"); //定义一个

指向D:/TEXT.TXT文件

OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream);

BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);

bufferedWriter.write(s);

bufferedWriter.close();
outputStreamWriter.close();
fileOutputStream.close();