Java 中IO流字符流详解及实例

public class ISReaderAndOSWriter {

  public static void main(String[] args) throws IOException {
    FileInputStream in = new FileInputStream("F:\\javaio\\java.txt");
    FileOutputStream out = new FileOutputStream("F:\\javaio\\java1.txt");
    
    InputStreamReader isr = new InputStreamReader(in, "gbk");
    OutputStreamWriter osw = new OutputStreamWriter(out, "gbk");
    
    int c;
//    while ((c = isr.read()) != -1) {
//      System.out.print((char)c);
//    }
    
    char[] buf = new char[8 * 1024];
    while ((c = isr.read(buf, 0, buf.length)) != -1) {
      String s = new String(buf, 0, c);
      //System.out.println(s);
      osw.write(s);
    }   
    isr.close();
    osw.close();
  }

}

public class FileReaderAndFileWriter {
  public static void main(String[] args) throws Exception {
    FileReader fr = new FileReader("F:\\javaio\\javautf.txt");
    FileWriter fw = new FileWriter("F:\\javaio\\javautf1.txt");
    //FileWriter fw = new FileWriter("F:\\javaio\\javautf1.txt", true);//向指定文件中追加内容
    
    char[] buf = new char[1 * 1024];
    int c;
    while ((c = fr.read(buf, 0, buf.length)) != -1) {
      System.out.println(c);
      fw.write(buf, 0, c);
      fw.flush();
    }
    fr.close();
    fw.close();
  }
}

public class BufRAndBufWOrPrintW {

  public static void main(String[] args) throws Exception {
    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("F:\\javaio\\javautf.txt")));
    //BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("F:\\javaio\\javautf2.txt")));
    PrintWriter pw = new PrintWriter("F:\\javaio\\javautf3.txt");
    
    String s;
    while ((s = br.readLine()) != null) {
      //一次读一行，不能识别换行符
      //bw.write(s);
      //bw.newLine();//写入一个行分隔符
      //bw.flush();
      pw.println(s);//通过写入行分隔符字符串终止当前行
      pw.flush();
    }
    br.close();
    //bw.close();
    pw.close();
  }
}