【Java】读写文本文件

package rw;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class test {
    public static void main(String[] agrc) throws IOException
    {
        //写入文件
        FileOutputStream out = new FileOutputStream("test.txt");
        for(int i=0;i<100;i++)
        {
            String s = "this line is " + i+"\n";
            out.write(s.getBytes());
        }
        out.close();

        //读取文件
        FileInputStream in = new FileInputStream("test.txt"); // 读取文件路径
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        for(int i=0;i<100;i++)
        {
            String line = br.readLine();
            System.out.println(line);
        }
        br.close();
        in.close();
    }
}