Java的IO流-缓冲流

字节缓冲流

package com.itheima.d2;

import java.io.*;

public class Test1 {
    public static void main(String[] args) {
        try (
                InputStream is = new FileInputStream("IO/src/itheima01.txt");
                //1、定义一个字节缓冲输入流包装原始的字节输入流
                InputStream bis = new BufferedInputStream(is, 8192 * 2);

                OutputStream os = new FileOutputStream("IO/src/itheima02.txt");
                //2、定义一个字节缓冲输出流包装原始的字节输出流
                OutputStream bos = new BufferedOutputStream(os, 8192 * 2);
                ){

            byte[] buffer = new byte[1024];
            int len;
            while ((len = bis.read(buffer)) != -1){
                bos.write(buffer, 0, len);
            }
            System.out.println("复制完成");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

字符缓冲流

BufferedWriter(字符缓冲输入流)

package com.itheima.d2;

import java.io.FileReader;
import java.io.Reader;

public class Test2 {
    public static void main(String[] args) {
        try(
                Reader fr = new FileReader("IO\\src\\itheima04.txt");
                //创建一个字符缓冲输入流包装原始的字符输入流
                BufferedReader br = new BufferedReader(fr)
        ){

          String line;//记住每次读取的一行数据
          while((line = br.readLine()) != null){
               System.out.println(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

BufferedWriter(字符缓冲输出流)

package com.itheima.d2;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.Writer;

public class Test3 {
    public static void main(String[] args) {
        try(
                Writer fw = new FileWriter("IO/src/itheima05.txt");
                //创建一个字符缓冲输出流管道包装原始的字符输出流
                BufferedWriter bw =  new BufferedWriter(fw);
                ) {
            bw.write('a');
            bw.newLine();
            bw.write('c');
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}