文件的复制通过字符流(writer)

public class CopyReaderAndWriter {
    public static void main(String[] args) {
      try {
        FileInputStream fileInputStream = new FileInputStream("learn.txt");
        //把字节流转化成字符流
        InputStreamReader isr = new InputStreamReader(fileInputStream);
        //public FileOutputStream(String name, boolean append)代表append可接字符串
        FileOutputStream fileOutputStream = new FileOutputStream("learn2.txt",true);
        //把字节流转化成字符流
        OutputStreamWriter osw = new OutputStreamWriter(fileOutputStream);
        
        char c [] = new char[1024];
        int l = 0;
        while ((l = isr.read(c)) != -1) {
            osw.write(new String(c,0,l));
        }
        isr.close();
        fileInputStream.close();
        osw.close();
        fileInputStream.close();
        System.out.println("done");
      
      } catch (Exception e) {
        e.printStackTrace();
        
    }
    }

}