依赖引入，pom.xml

<dependency>
            <groupId>com.github.stuxuhai</groupId>
            <artifactId>jpinyin</artifactId>
            <version>1.1.8</version>
        </dependency>

封装工具类 SimpleToTraditionalUtils

package com.iot.power.boot.utils;


import com.github.stuxuhai.jpinyin.ChineseHelper;
import org.apache.commons.collections.CollectionUtils;

import java.io.*;
import java.util.ArrayList;
import java.util.regex.Pattern;

/**
 * Created by zhangzhenhua
 */
public class SimpleToTraditionalUtils {
    

    public static void main(String[] args) {
    
        SimpleChineseToTraditionalWithPath("F:\\testFile\\test");
    }

    public static void SimpleChineseToTraditionalWithPath(String path){
    
        ArrayList<String> tempArray = new ArrayList<>();
        ArrayList<String> fileList = traverseFolder2(path , tempArray);
        if(CollectionUtils.isEmpty(fileList)){
    
            return;
        }
        for (int i = 0; i<fileList.size() ; i++){
    
            readFileAndReWriteInNewFile(fileList.get(i));
        }
        System.out.println("转换结束");
    }

    public static void readFileAndReWriteInNewFile(String filePath){
    
        // 简体转繁体
        try{
    
            BufferedReader bufRead = new BufferedReader(new InputStreamReader(new FileInputStream(new File(filePath))));
            StringBuilder strBuffer = new StringBuilder();
            Pattern pattern = Pattern.compile("[\u4e00-\u9fcc]+");
            for (String temp; (temp = bufRead.readLine())!= null; ){
    
                if (pattern.matcher(temp).find()){
    
                    temp = convertToTraditionalChinese(temp);
                }
                strBuffer.append(temp);
                strBuffer.append(System.getProperty("line.separator"));
            }
            //本地调试打印
            System.out.println(strBuffer.toString());
            bufRead.close();
            PrintWriter printWriter = new PrintWriter(filePath);
            printWriter.write(strBuffer.toString().toCharArray());
            printWriter.flush();
            printWriter.close();
        }catch (IOException e){
    
            e.printStackTrace();
        }
    }


    /**
     * 遍历传入的根文件夹，获取每一级文件夹的每个文件
     * @param path 文件夹路径
     * @param listFileName 返回文件路径的list
     * @return
     */
    public static ArrayList<String> traverseFolder2(String path , ArrayList<String> listFileName) {
    
        File file = new File(path);
        if (file.exists()) {
    
            File[] files = file.listFiles();
            if (files == null || files.length == 0) {
    
                System.out.println("文件夹是空的!");
                return null;
            } else {
    
                for (File file2 : files) {
    
                    if (file2.isDirectory()) {
    
                        traverseFolder2(file2.getAbsolutePath(),listFileName);
                    } else {
    
                        String solutePath = file2.getAbsolutePath();
                        //以下文件格式根据自己实际添加或删除
                        if (solutePath.endsWith(".jsp") || solutePath.endsWith(".js")
                                || solutePath.endsWith(".html") || solutePath.endsWith(".java")
                                || solutePath.endsWith(".properties") || solutePath.endsWith(".sql")
                         ){
    
                            listFileName.add(file2.getAbsolutePath());
                        }
                    }
                }
            }
        } else {
    
            System.out.println("文件不存在!");
        }
        return listFileName;
    }

    /**
     * 简体转换为繁体
     * @param simpleStr 要转换的字符串
     * @return
     */
    public static String convertToTraditionalChinese(String simpleStr) {
    
        String tempStr;
        try {
    
            tempStr = ChineseHelper.convertToTraditionalChinese(simpleStr);
        } catch (Exception e) {
    
            tempStr = simpleStr;
            e.printStackTrace();
        }
        //本地验证系字转换有问题，单独处理
        return tempStr.replace("係", "系");

    }

}

写在结尾
本人实际项目中对.html、.js、.java、.sql、.properties转换基本没发现问题，自己仔细验证了项目转换为繁体后的页面显示和功能都正常，除了唯一看到“系”字转换错误。