java中字节流的选择,求助，java中怎么用字节流读写汉字

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import java.io.*;

public class ReadAndWrite{

public static void main(String args[]){

FileInputStream fin;

FileOutputStream fout;

int ch;

try{

int b;

fin = new FileInputStream(FileDescriptor.in);

fout = new FileOutputStream(FileDescriptor.out);

InputStreamReader reader = new InputStreamReader(fin,"gbk");

OutputStreamWriter writer = new OutputStreamWriter(fout,"gbk");

System.out.println("输入姓名");

while((b=reader.read())!='\r'){

System.out.print((char)b);

}

System.out.println("\r\n文件写入成功");

fin.close();

fout.close();

writer.flush();

}catch(FileNotFoundException e){

System.out.println("不能创建文件");

}catch(IOException e){

System.out.println("输入流有误");

}

}

}