Java的IO流-缓冲流-编程知识

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();}}
}