java如何判断最后一行有没有换行符 java readline怎么判断的行

package com.company;
import java.io.*;
public class Main {
     public static void main(String[] args) {                File file1 = new File("E:\\AH\\5062faf808c471d4a7ef738b89e62aa8.m3u8"); // 创建File类对象
                 FileInputStream fis = null;
                 InputStreamReader isr = null;
                 BufferedReader br = null;
                 try {
                     try {
                         fis = new FileInputStream(file1);
                     } catch (FileNotFoundException e) {
                         e.printStackTrace();
                     }
                     isr = new InputStreamReader(fis);
                     br = new BufferedReader(isr);
                     String lineTxt = null;
                     // 从缓冲区中逐行读取代码，调用readLine()方法
                     while ((lineTxt = br.readLine()) != null) {
                         if (lineTxt.contains(".ts")) { //判断关键字
                            System.out.println(lineTxt); // 逐行输出文件内容
                         }
                     }
                 } catch (FileNotFoundException e) {
                     e.printStackTrace();
                 } catch (IOException e) {
                     e.printStackTrace();
                 } finally {
                     // 关闭数据流
                     if (br != null) {
                         try {
                             br.close();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                     }
                     if (isr != null) {
                         try {
                             isr.close();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                     }
                     if (fis != null) {
                         try {
                             fis.close();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                     }
                 }
             }
 }