缓冲流的基本用法

package myIO;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/*
* BufferedWriter:将文本写入字符输出流，缓冲各个字符，从而提供单个字符、数组和字符串的写入
* BufferedReader:从字符输入流中读取文本，缓冲各个字符，从而实现字符、数组和行的高效读取
*/
public class BufferdStreamDemo {
       public static void main(String[] args) throws IOException {

           //创建输出缓冲流对象
           BufferedWriter bw = new BufferedWriter(new FileWriter("bw.txt"));
           //方法
           bw.write("jiangziyu");
           bw.flush();
           //释放资源
           bw.close();


           //创建输入流缓冲对象
           BufferedReader br = new BufferedReader(new FileReader("bw.txt"));
//           //一次读写一个字符
//           int ch;
//           while((ch=br.read())!=-1) {
//               System.out.print((char)ch);
//           }
           //一次读写一个字符数组
           char[] chs = new char[1024];
           int len;
           while((len=br.read(chs))!=-1) {
               System.out.println(new String(chs,0,len));
           }
           //释放资源
           br.close();
       }
}

======================================================================

package myIO;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/*
* 将项目路径下的FileWriterDemo.java文件内容复制到Copy.java中
*
* 源地：FileWriterDemo.java
* 目的地：copy.java
*/
public class copyfiledemo {
       public static void main(String[] args) throws IOException {
           //创建输入缓冲流对象
           BufferedReader br = new BufferedReader(new FileReader("FileWriterDemo.java"));
           //创建输出流缓冲对象
           BufferedWriter bw = new BufferedWriter(new FileWriter("copy.java"));

           //读写数据
           //一次读写一个字符
           int ch;
           while((ch=br.read())!=-1) {
               bw.write(ch);
           }
           //释放资源
           br.close();
           bw.close();
       }
}

来源：CSDN

作者：UPUPUUP

链接：https://blog.csdn.net/qq_39409781/article/details/103847979

标签

字符

filereader