InputStreamReader和OutputStreamWriter设置相同编码还是乱码

都使用UTF-8时，windows系统上还是乱码，是哪里有什么问题嘛

package com.imooc.file;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

public class ReaderDemo {

public static void main(String[] args) {

// TODO Auto-generated method stub

try {

FileInputStream fis = new FileInputStream("imooc.txt");

InputStreamReader isr = new InputStreamReader(fis,"UTF-8");

FileOutputStream fos = new FileOutputStream("imooc1.txt");

OutputStreamWriter osw = new OutputStreamWriter(fos,"UTF-8");

int n = 0;

char[] cbuf = new char[10];

// while((n=isr.read())!=-1) {

// System.out.print((char)n);

// }

// while((n=isr.read(cbuf))!=-1) {

// String s = new String(cbuf,0,n);

// System.out.print(s);

// }

while((n=isr.read(cbuf))!=-1) {

// String s = new String(cbuf,0,n);

// osw.write(s);

osw.write(cbuf,0,n);

}

osw.close();

fos.close();

fis.close();

isr.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}