package com.atguigu.java;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import javax.print.attribute.standard.Destination;

import org.junit.Test;

/* 
* 抽象基類         節(jié)點(diǎn)流（文件流）        緩沖流(處理流的一種，可以提高文件處理效率)
* InputStream      FileInputStream        BufferedInputStream
* OutputStream    FileOutputStream       BufferedOutputStream  (flus())
* Reader            FileReader             BufferedReader  (readLine())
* Writer            FileWriter             BufferedWriter  (flus())（bw.newLine()）
*/

public class testBuffered {
    @Test
    public void testBufferedReader(){
        BufferedReader br = null;
        BufferedWriter bw = null;
        try {
            File file = new File("07.txt");
            File file1 = new File("08.txt");
            FileReader fr = new FileReader(file);
            FileWriter fw = new FileWriter(file1);
            br = new BufferedReader(fr);
            bw = new BufferedWriter(fw);
//          char[] c = new char[1024];
//          int len;
//          while((len = br.read(c))!= -1){
//              String str = new String(c, 0, len);
//              System.out.println(str);
//          }
            
            String str;
            while((str = br.readLine()) != null){
//              System.out.println(str);
                bw.write(str);//上面是在一行讀出來(lái)的，現(xiàn)在寫(xiě)也不會(huì)換行，加入新方法
//              System.out.println();//不換行
//              bw.write(str + "\n");//這種方法換行也可以
                bw.newLine();
                bw.flush();
            }
            
        } catch (Exception e) {
            e.printStackTrace();
        }finally{//先關(guān)吧
            if(bw != null){
                try {
                    bw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                
            }
            if(br != null){
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                
            }
        }
        
        
    }
    
    @Test
    public void testCopyFile(){
        long start = System.currentTimeMillis();
        String src = "C:\\Users\\xiaotinh\\Desktop\\03.jpg";
        String dest = "C:\\Users\\xiaotinh\\Desktop\\05.jpg";
        copyFile(src, dest);
        long end = System.currentTimeMillis();
        System.out.println("文件復(fù)制的時(shí)間：" + (end - start));//15ms
        
    }
    //使用緩沖流實(shí)現(xiàn)文件的復(fù)制的方法
    public void copyFile(String src,String dest){
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            //1.提供讀入、寫(xiě)出的文件
            File file1 = new File(src);
            File file2 = new File(dest);
            //2.先創(chuàng)建相應(yīng)的節(jié)點(diǎn)流：FileInputStream、FileOutputStream
            FileInputStream fis = new FileInputStream(file1);
            FileOutputStream fos = new FileOutputStream(file2);
            //3.將創(chuàng)建的節(jié)點(diǎn)流的對(duì)象作為形參傳遞給緩沖流的構(gòu)造器中
            bis = new BufferedInputStream(fis);
            bos = new BufferedOutputStream(fos);
            //4.具體的實(shí)現(xiàn)文件復(fù)制的操作
            byte[] b = new byte[1024];
            int len;
            while((len = bis.read(b)) != -1){
                bos.write(b, 0, len);
                bos.flush();//最好后面都加一句這個(gè)，因?yàn)榍懊鎺状味紝?xiě)出去了，
                //但是到最后一句的時(shí)候，可能沒(méi)有寫(xiě)滿，這時(shí)需要清空一下，防止對(duì)下次有影響
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally{
            //5.關(guān)閉相應(yīng)的流
            if(bos != null){
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(bis != null){
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    
    
    //使用BufferedInputStream和BufferedOutputStream實(shí)現(xiàn)非文本文件的復(fù)制
    @Test
    public void testBufferedInputOutputStream(){
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            //1.提供讀入、寫(xiě)出的文件
            File file1 = new File("C:\\Users\\xiaotinh\\Desktop\\03.jpg");
            File file2 = new File("C:\\Users\\xiaotinh\\Desktop\\04.jpg");
            //2.先創(chuàng)建相應(yīng)的節(jié)點(diǎn)流：FileInputStream、FileOutputStream
            FileInputStream fis = new FileInputStream(file1);
            FileOutputStream fos = new FileOutputStream(file2);
            //3.將創(chuàng)建的節(jié)點(diǎn)流的對(duì)象作為形參傳遞給緩沖流的構(gòu)造器中
            bis = new BufferedInputStream(fis);
            bos = new BufferedOutputStream(fos);
            //4.具體的實(shí)現(xiàn)文件復(fù)制的操作
            byte[] b = new byte[1024];
            int len;
            while((len = bis.read(b)) != -1){
                bos.write(b, 0, len);
                bos.flush();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally{
            //5.關(guān)閉相應(yīng)的流
            if(bos != null){
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(bis != null){
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}