InputStreamReader

import java.io.*;

public class Demo02InputStreamReader {
    public static void main(String[] args) throws IOException {

        InputStreamReader ifr =new InputStreamReader(new FileInputStream("F:\basic\untitled13\src\it\cast\day15\demo05\a.txt"),"GBK");
//读取GBK文件，默认读取UTF-8格式编码文件
        int len=0;
        while ((len=ifr.read())!=-1){
            System.out.println((char) len);
        }
        ifr.close();

    }
}