Buffered读写中文文件乱码

import java.io.*;public class IOTest {    public static void main(String[] args) throws Exception    {        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("in.txt"),"GB2312"));        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("out.txt"),"GB2312"));        String data = null;        while((data = br.readLine())!=null)        {            System.out.println(data);            bw.write(data);            bw.newLine();        }        br.close();        bw.close();    }}