java中的缓冲流！

package cn.zhozuohou;

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.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/*
 * 一、缓冲流？
 *       【缓冲流的目的就是提高读写效率。】
 *
 * 二、字节输入输出缓冲流！

  1.字节输入缓冲流！
       BufferedInputStream  读！ read（）  复制！文件到程序！  BufferedInputStream a1=new BufferedInputStream(new FileInputStream(文件));
  2.字节输出缓冲流！
       BufferedOutputStream  写！ write（） 拷贝！程序到文件！  FileOutputStream a1=new FileOutputStream("文件);

  3.字节缓冲流拷贝文件，效率非常高！
    1.先读后写
      BufferedInputStream a1=new   BufferedInputStream (new FileInputStream("D:\\XMind\\1.dat"));
      BufferedOutputStream a2=new   BufferedOutputStream(new FileOutputStream("d:\\game\\1.dat"));

  三、字符输入输出缓冲流！

   1.字符输入缓冲流。读！read
      BufferedReader;        BufferedReader a1=new BufferedReader(new FileReader(文件名));  字符类型 String char

   2.字符输出缓冲流！ 写！ write
      BufferedWrite;         FileWriter a1=new FileWriter(文件名);

   3.字符缓冲流拷贝文件！
          BufferedReader a1=new BufferedReader(new FileReader("d:\\game\\abc.txt"));
       BufferedWriter a2=new BufferedWriter(new FileWriter("d:\\day13\\abc.txt"));

 *
 *
 */
public class 缓冲流 {
    public static void main(String[] args) throws IOException {
         bufferedInputStream();     //1.字节输入缓冲流  读!   慢  快！
         bufferedOutputStream(); //2.字节输出缓冲流
//         copy01();                //3.字节缓冲流拷贝文件！  速度快！
//         copy02();                //4.普通字节流拷贝文件！
         bufferedReader();        //5.字符输入缓冲流！
         bufferedWriter();        //6.字符输出缓冲流！
         copy03();                //7.字符缓冲流流复制文件！

    }
    //7.字符缓冲流流复制文件！
    private static void copy03() throws IOException{
        BufferedReader a1=new BufferedReader(new FileReader("d:\\game\\aa.txt"));
        BufferedWriter a2=new BufferedWriter(new FileWriter("C:\\aa.txt"));
        int len=0;
        char[]b=new char[1024*10000];
        while ((len=a1.read(b))!=-1) {
            a2.write(b,0,len);
        }
        a1.close();
        a2.close();

    }
    //6.字符输出缓冲流！
    private static void bufferedWriter() throws IOException{
        BufferedWriter a1=new BufferedWriter(new FileWriter("d:\\game\\aaa.txt"));
        a1.write("你好");
        a1.flush();
        String b="zhou xu feng";
        a1.write(b,0,8);
        a1.flush();
        a1.close();

    }
    //5.字符输入缓冲流！
    private static void bufferedReader() throws IOException {
        int num=0;
        BufferedReader a1=new BufferedReader(new FileReader("d:\\game\\aa.txt"));
        String line;                                                                    //缓冲流特有方法 读取文本单行！
        byte []b=new byte[1024*10];                                                    //快速读取！
        while ((line=a1.readLine())!=null) {                                            //集合非空！
            num++;
            System.out.println("第"+num+"行的内容  "+line);
        }
        a1.close();
    }
    //4.普通字节流拷贝文件！
    private static void copy02() throws IOException{
        long t1=System.currentTimeMillis();
        FileInputStream a1=new FileInputStream("E:\\代码\\27\\视屏\\1.mp4");
        FileOutputStream a2=new FileOutputStream("d:\\1.mp4");
        int len=0;
        byte []b=new byte[1024*10000];
        while ((len=a1.read(b))!=-1) {
            a2.write(b,0,len);
        }
        a1.close();
        a2.close();
        long t2=System.currentTimeMillis();
        System.out.println("利用字节流复制文件的时间！"+(t2-t1)+"毫秒");
    }
    //3.字节缓冲流拷贝文件！  速度快！
    private static void copy01() throws IOException{
        long t1=System.currentTimeMillis();
        BufferedInputStream a1=new BufferedInputStream(new FileInputStream("E:\\代码位置\\27\\视屏\\1.mp4"));
        BufferedOutputStream a2=new BufferedOutputStream(new FileOutputStream("d:\\1.mp4"));
        int len=0;
        byte []b=new byte[1024*10000];
        while ((len=a1.read(b))!=-1) {
            a2.write(b,0,len);
        }
        a1.close();
        a2.close();
        long t2=System.currentTimeMillis();
        System.out.println("利用字节缓冲流复制文件的时间！"+(t2-t1)+"毫秒");

    }
     //2.字节输出缓冲流
    private static void bufferedOutputStream() throws IOException {
        BufferedOutputStream a1=new BufferedOutputStream(new FileOutputStream("d:\\game\\aa.txt"));
        a1.write(100);
        //添加字符串！
        byte b[]="zhou xu feng".getBytes();
        a1.write(b,0,12);
        a1.close();
    }
    //1. 字节输入缓冲流  读!   慢  快！
    private static void bufferedInputStream() throws IOException{
        BufferedInputStream a1=new BufferedInputStream(new FileInputStream("d:\\game\\aa.txt"));
                                                                                /*1.快速读取方式
                                                                                    int len=0;
                                                                                    byte[] b=new byte[1024*10];
                                                                                    while ((len=a1.read(b))!=-1) {
                                                                                    System.out.println(new String(b,0,len));
                                                                                }*/
        //普通方式！
        int len=0;
        while ((len=a1.read())!=-1) {
            System.out.print((char)len+"  ");                                    //直接输出len 是一堆数字 通过（char）将他们转换成字符
        }

        a1.close();
        System.out.println("===================");
    }
}