Java读取txt内容并处理重写入txt

记录一下java读取写入文件的方法，也算是回顾了，太久没看了...

import java.io.*;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        //原文件路径+文件名
        String filePath = "C:\\Users\\gawei\\Desktop\\hmsd.txt";
        //目标文件路径+文件名
        String destPath = "C:\\Users\\gawei\\Desktop\\hmsdNew.txt";
        //读取文件，并做日期格式转化
        List<String> newDate = readTxtFile(filePath);
        //写入新格式日期到txt
        writeFile(newDate, destPath);
    }
    //读取文件，并保存为List
    public static List<String> readTxtFile(String filePath) {
        List<String> newDate = new ArrayList<>();
        try {
            String encoding = "UTF-8";//编码格式
            File file = new File(filePath);
            if (file.isFile() && file.exists()) {
                InputStreamReader read = new InputStreamReader(
                                          new FileInputStream(file), encoding);
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {
                    String newdate = handle(lineTxt);
                    System.out.println(newdate);
                    newDate.add(newdate);
                }
                read.close();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return newDate;
    }

    //写入文件
    private static void writeFile(List<String> newDate, String destPath) {
        File file = new File(destPath);
        try {
            if (!file.exists()) {
                file.createNewFile(); //文件若不存在则新建
            }
            FileWriter fileWriter = null;
            fileWriter = new FileWriter(file);
            BufferedWriter bw;
            bw = new BufferedWriter(fileWriter);
            for (int j = 0; j < newDate.size(); j++) {
                bw.write(newDate.get(j));
                bw.newLine();//换行
                bw.flush();
            }
            bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //转化日期从2023/3/20 10:42:00 转化为 2023-03-20 10:42:00
    public static String handle(String s) {
        DateFormat df = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        DateFormat df1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date d1 = null;
        try {
            d1 = df.parse(s);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return df1.format(d1);
    }

}