Java之转换流

    转换流也是处理流的一种，分为OutputStreamWriter、InputStreamReader两种，是将字节流转化为字符流进行读取或者写入。

public class TestTransForm1 {
  public static void main(String[] args) {
    try {
      //将OutputStream转换成Writer
      OutputStreamWriter osw = new OutputStreamWriter(
           new FileOutputStream("d:\\bak\\char.txt"));//将字节流包装在转换流里，没有指定编码时就用当前系统默认编码
      osw.write("mircosoftibmsunapplehp");
      System.out.println(osw.getEncoding());
      osw.close();
      osw = new OutputStreamWriter(
      								new FileOutputStream("d:\\bak\\char.txt", true),//true代表在原来的文件上追加，不然会覆盖
      								"ISO8859_1"); // 字符编码
      osw.write("mircosoftibmsunapplehp");
      System.out.println(osw.getEncoding());
      osw.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

public class TestTransForm2 {
  public static void main(String args[]) {
    InputStreamReader isr = 
            new InputStreamReader(System.in);//System.in接收键盘的输入
    BufferedReader br = new BufferedReader(isr);//再封装一层缓冲流
    String s = null;
    try {
      s = br.readLine();
      while(s!=null){
        if(s.equalsIgnoreCase("exit")) break;
        System.out.println(s.toUpperCase());
        s = br.readLine();
      }
      br.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}