Java FileInputStream.read()在打印时显示不需要的字符

public int read() throws IOException

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) {
        try {
            FileInputStream fis = new FileInputStream("file.txt");
            InputStreamReader isr = new InputStreamReader(fis, "UTF-8");
            
            int data;
            while ((data = isr.read()) != -1) {
                System.out.print((char) data);
            }
            
            isr.close();
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}