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

public class BufferReader {
    public static void main(String[] args){
        try {
            BufferedReader bufferedReader = new BufferedReader(new FileReader("src/test.txt")); //相对文件路径，如果是放在项目文件夹下，则为new FileReader("test.txt");
            String string;
            while ((string=bufferedReader.readLine()) != null){
                System.out.println(string);
            }
            System.out.println(string);
        } catch (IOException  e) {
            e.printStackTrace();
        }
    }
}

目录关系

运行效果