Java中的IO操作 RWByBufferedCharStream

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;


public class RWByBufferedCharStream {

    public static void main(String[] args) {
        try {


            //File file = new File("java.txt");
            FileInputStream fis = new FileInputStream("java.txt");
            FileOutputStream fos = new FileOutputStream("java_new_buff.txt");
            InputStreamReader isr = new InputStreamReader(fis, "UTF-8");
            OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
            
            BufferedReader br = new BufferedReader(isr);
            //BufferedWriter bw = new BufferedWriter(osw);
            PrintWriter pw = new PrintWriter(osw,true);
            
            String input;
            while ((input = br.readLine()) != null) {
                //bw.write(input);
                pw.println(input);
            }
            br.close();
            //bw.flush();bw.close();
            pw.close();
            isr.close();
            fis.close();
            osw.close();
            fos.close();
            System.out.println("done");

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}