package demo;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStreamWriter;

public class Demo {

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

        writeGBK();

        writeUTF8();

    }

    public static void writeGBK() throws IOException {

        FileOutputStream fos = new FileOutputStream("d:\\gbk.txt");

        OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK");

        osw.write("你好");// gbk的一个汉字是2个字节

        osw.close();

    }

    public static void writeUTF8() throws IOException {

        FileOutputStream fos = new FileOutputStream("d:\\utf8.txt");

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

        osw.write("你好");// utf8的一个汉字是3个字节

        osw.close();

    }

}

package demo;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

public class Demo {

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

        readGBK();

        readUTF8();

    }

    public static void readGBK() throws IOException {

        FileInputStream fis = new FileInputStream("d:\\gbk.txt");

        InputStreamReader isr = new InputStreamReader(fis);

        char[] ch = new char[1024];

        int len = isr.read(ch);

        System.out.println(new String(ch, 0, len));

    }

    public static void readUTF8() throws IOException {

        FileInputStream fis = new FileInputStream("d:\\utf8.txt");

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

        char[] ch = new char[1024];

        int len = isr.read(ch);

        System.out.println(new String(ch, 0, len));

    }

}