转换流

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class TransFormatioDemo {
    public static void main(String[] args) throws IOException {
        FileOutputStream fos0 = new FileOutputStream("E:\\IO流\\java\\221.txt");
        OutputStreamWriter osw0 = new OutputStreamWriter(fos0, "utf-8");
        osw0.write("从一种能量形式变成另一种能量形式电能到机械能的转换");
        osw0.close();

        FileOutputStream fos = new FileOutputStream("E:\\IO流\\java\\121.txt");
        OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK");// 系统默认
        osw.write("从一种能量形式变成另一种能量形式电能到机械能的转换");
        osw.close();

    }
}

package pers.zxx.Input;

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

public class InputStreamReaderDemo {
public static void main(String[] args) throws IOException {
    FileInputStream in = new FileInputStream("E:\\IO流\\java\\221.txt");
    InputStreamReader isr = new InputStreamReader(in,"utf-8");
    int ch = 0;
    while((ch = isr.read())!=-1){
        System.out.print((char)ch);
    }
    isr.close();

    
    
}
}