package cn.sasa.demo4;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

public class OutputStreamWriterDemo {

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

        /**

         * FileWriter 不能指定字符编码

         *

         * 用OutputStreamWriter

         * 将字符流转成字节流

         *

         */

//        writeGBK();

        //writeUTF8();

        //readGBK();

        readUTF8();

    }

    static void writeGBK() throws IOException {

        //1、创建一个FileOutputStream，绑定目的

        FileOutputStream output = new FileOutputStream("d:/sasa/test1225.txt");

        //2、创建一个OutputStreamWriter，指定字符编码，

        //构造函数的第二个字符串参数指定字符编码，不写默认是系统的默认编码GBK

        OutputStreamWriter writer = new OutputStreamWriter(output);

        //3、调用write

        writer.write("你好");

        writer.flush();

        writer.close();

    }

    static void writeUTF8() throws IOException {

        FileOutputStream output = new FileOutputStream("d:\\sasa\\utf.txt");

        OutputStreamWriter writer = new OutputStreamWriter(output, "UTF-8");

        writer.write("啦啦啦");

        writer.flush();

        writer.write("你好");

        writer.flush();

        writer.close();

    }

    static void readGBK() throws IOException {

        FileInputStream input = new FileInputStream("d:\\sasa\\test1225.txt");

        InputStreamReader reader = new InputStreamReader(input);

        char[] charArr = new char[1024];

        @SuppressWarnings("unused")

        int len = 0;

        while((len = reader.read(charArr)) != -1) {

            System.out.print(new String(charArr));

        }

        reader.close();

    }

    static void readUTF8() throws IOException {

        FileInputStream input = new FileInputStream("d:\\sasa\\utf.txt");

        InputStreamReader reader = new InputStreamReader(input , "UTF-8");

        char[] charArr = new char[1024];

        @SuppressWarnings("unused")

        int len = 0;

        while((len = reader.read(charArr)) != -1) {

            System.out.print(new String(charArr));

        }

        reader.close();

    }

}