InputStreamReader & OutputStreamWriter

InputStreamReader 是字节流通向字符流的桥梁：它使用指定的 charset 读取字节并将其解码为字符。

OutputStreamWriter 是字符流通向字节流的桥梁：可使用指定的 charset 将要写入流中的字符编码成字节。

public class Client8 {

    public static void main(String[] args) throws IOException {

        BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("b.txt")));
        String line = null;
        while((line=bufr.readLine())!=null){
            if("over".equals(line))
                break;
            bufw.write(line.toUpperCase());
            bufw.newLine();
            bufw.flush();
        }
    }
}

public class TransStreamDemo {

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {

        //字节流。
        InputStream in = System.in;
//        int ch = in.read();
//        System.out.println(ch);
//        int ch1 = in.read();
//        System.out.println(ch1);

        //将字节转成字符的桥梁。装换流。
        InputStreamReader isr = new InputStreamReader(in);

//        int ch = isr.read();
//        System.out.println((char)ch);

        //字符流。
        BufferedReader bufr = new BufferedReader(isr);

        OutputStream out = System.out;

        OutputStreamWriter osw = new OutputStreamWriter(out);

        BufferedWriter  bufw = new BufferedWriter(osw);

        String line = null;

        while((line=bufr.readLine())!=null){
            if("over".equals(line))
                break;
//            System.out.println(line.toUpperCase());
//            osw.write(line.toUpperCase()+"\r\n");
//            osw.flush();

            bufw.write(line.toUpperCase());
            bufw.newLine();
            bufw.flush();
        }
    }
}