IO各种源使用清晰区别

IO各种流使用清晰区别

引用：http://www.iteye.com/topic/175121

?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：?

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InputStreamReaderBufferedReader 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

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

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();