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 不能指定字元編碼
         * 
         * 用OutputStreamWriter
         * 將字元流轉成位元組流
         *  
         */
//        writeGBK();
        //writeUTF8();
        //readGBK();
        readUTF8();
    }
    
    static void writeGBK() throws IOException {
        //1、建立一個FileOutputStream，繫結目的
        FileOutputStream output = new
 
 FileOutputStream("d:/sasa/test1225.txt");
        
        //2、建立一個OutputStreamWriter，指定字元編碼，
        //建構函式的第二個字串引數指定字元編碼，不寫預設是系統的預設編碼GBK
        OutputStreamWriter writer = new OutputStreamWriter(output);
        
        //3、呼叫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();
    }
}