Java-I/O框架08：BufferedReader、BufferedWriter、PrintWriter使用

怒放的生命.2024-11-03 19:21

视频链接：16.22 PrintWriter的使用_哔哩哔哩_bilibilihttps://www.bilibili.com/video/BV1Tz4y1X7H7?spm_id_from=333.788.videopod.episodes&vd_source=b5775c3a4ea16a5306db9c7c1c1486b5&p=22

1.BufferedReader使用

java 复制代码

package com.yundait.Demo05;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;

public class BufferedReaderDemo01 {
    public static void main(String[] args) throws Exception {
        //1创建文件字符写入缓冲流
        FileReader fr = new FileReader("C:\\Users\\Public\\Documents\\ggg1.txt");
        BufferedReader br = new BufferedReader(fr);

        //读取文件（方式1）
//        char[] chars = new char[1024];
//        int count;
//        while ((count = br.read(chars))!=-1){
//            System.out.println(new String(chars,0,count));
//        }

        //读取文件（方式2）
        String s;
        while ((s = br.readLine())!=null){
            System.out.println(s);
        }

        //3关闭
        br.close();
    }
}

2.BufferedWriter使用

java 复制代码

package com.yundait.Demo05;

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

public class BufferedWriterDemo01 {
    public static void main(String[] args) throws Exception {
        //1创建文件字符写入缓冲流
        FileWriter fw = new FileWriter("C:\\Users\\Public\\Documents\\ggg2.txt");
        BufferedWriter bw = new BufferedWriter(fw);

        //2写入文件

        for (int i=0; i<10; i++){
            bw.write("好好学习，天天向上");
            bw.newLine();
            bw.flush();
        }

        //关闭通道
        bw.close();
        System.out.println("执行完毕");
    }
}

3.PrintWriter使用

java 复制代码

package com.yundait.Demo05;

import java.io.FileNotFoundException;
import java.io.PrintWriter;

public class PrintWriterDemo01 {
    public static void main(String[] args) throws Exception {
        //1.创建字符打印流
        PrintWriter pw = new PrintWriter("C:\\Users\\Public\\Documents\\ggg3.txt");

        //2打印
        pw.println(97);
        pw.println(true);
        pw.println('张');
        pw.println(3.14);

        //关闭
        pw.close();
        System.out.println("执行完毕");
    }
}