java语言基础--转换流解决字符乱码问题

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.UnsupportedEncodingException;

public class InputStreamReaderTest {

    public static void main(String[] args) {
        try (BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("utf-8.txt"), "utf-8"));
                BufferedWriter bw = new BufferedWriter(
                        new OutputStreamWriter(new FileOutputStream("gbk.txt"), "gbk"))) {
            String msg;
            while ((msg = br.readLine()) != null) {
                bw.write(msg);
                bw.newLine();
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}