package practice.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
/**
 * 
 * @author ljz
 *     ******************
 *        *位元組流           *字元流       
 *  讀    InputStream      Reader
 *  寫    OutputSrtream    Writer
 * 位元組流和字元流的差別
 * 1、  位元組流需要先將String轉換成byte陣列然後才能使用流進行寫，寫的時候也是寫入byte陣列。
 *      字元流可直接對string進行寫，讀的時候讀入char陣列
 * 2、  位元組流不使用快取
 *      字元流使用快取，可以使用flush將快取中的內容寫入硬碟
 */
 

public class IOPra {
    public static void main(String[] args){
        IOPra p = new IOPra();
        try {
            p.zijiePra();
            p.zifuPra();
            p.zijieInPra();
            p.zifuInPra();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public
 
 void zijiePra() throws Exception{
        File file =  new File(".." + File.separator + "位元組.txt");
        file.createNewFile();
        String str = "io practice !";
        byte[] by = str.getBytes();
        OutputStream os = new FileOutputStream(file);
        os.write(by);
        os.close();
        System.out.println("finish"
 
);
    }
    public void zifuPra() throws Exception{
        File file = new File(".." + File.separator + "字元.txt");
        file.createNewFile();
        String str = "io practice !";
        Writer writer = new FileWriter(file);
        writer.write(str);
        //writer.flush();
        writer.close();
        System.out.println("finish");
    }

    public void zijieInPra() throws Exception{
        File file = new File(".." + File.separator + "位元組.txt");
        InputStream is = new FileInputStream(file);
        byte[] by = new byte[(int) file.length()];
        int len = is.read(by);
        System.out.println(len + ":" + new String(by));
        is.close();
    }

    public void zifuInPra() throws Exception{
        File file = new File(".." + File.separator + "字元.txt");
        Reader re = new FileReader(file);
        char[]  ch = new char[(int)file.length()];
        int len = re.read(ch);
        System.out.println(len + ":" + new String(ch));
        re.close();
    }
    public void copyFile() throws Exception{
        File souFile = new File(".." + File.separator + "位元組.txt");
        File desFile = new File("D:" + File.separator + "copy位元組.txt");
        if(desFile.exists())
            desFile.createNewFile();
        byte[]  by = new byte[(int)souFile.length()];
        InputStream is = new FileInputStream(souFile);
        is.read(by);
        OutputStream os = new FileOutputStream(desFile);
        os.write(by);
        is.close();
        os.close();
    }
}