<dependency>
  <groupId>cn.hutool</groupId>
  <artifactId>hutool-all</artifactId>
  <version>4.5.6</version>
 </dependency>

import java.io.File;
import java.io.FileFilter;
import java.nio.charset.Charset;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.lang.Console;
import cn.hutool.core.util.StrUtil;
public class ConcertEncodeing {
 public static void main(String[] args) {
 convertCharset("D:\\workspaces\\workspaceOxygen\\ceshi",Charset.forName("GBK"),Charset.forName("UTF-8"),"java");
 }
 /**
 * 轉換文件編碼格式
 * @param path 需要轉換的文件或文件夾路徑
 * @param fromCharset 原編碼格式
 * @param toCharset 目標編碼格式
 * @param expansion 需要轉換的文件擴展名,如需全部轉換則傳 null
 */
 private static void convertCharset(String path,Charset fromCharset,Charset toCharset,String expansion ) {
 if (StrUtil.isBlank(path)) {
  return;
 }
 File file = FileUtil.file(path);
 File[] listFiles = file.listFiles(new FileFilter() {
  @Override
  public boolean accept(File pathname) {
  if (StrUtil.isBlank(expansion)) {
   return true;
  }
  if (FileUtil.isDirectory(pathname)||FileUtil.extName(pathname).equals("java")) {
   return true;
  }
  return false;
  }
 });
 for (int i = 0; i < listFiles.length; i++) {
  if (listFiles[i].isDirectory()) {
  String canonicalPath = FileUtil.getCanonicalPath(listFiles[i]);
  //每個文件夾分個線程處理,提高點兒效率
  new Thread(new Runnable() {
   @Override
   public void run() {
   convertCharset(canonicalPath,fromCharset,toCharset,expansion);
   }
  }).start();
  }else {
  FileUtil.convertCharset(listFiles[i], fromCharset, toCharset);
  Console.log("轉換完成文件名:{}",listFiles[i].getName());
  }
 }
 }
}