如何根据文件夹中文件，生成对应名字的图片，名称一样的路径，这里用到了变量，将集合定义在外面，字符串拼接，正则表达式截取.jpg文件

public class CopyJpg {
    public static void main(String[] args) throws IOException {
        //根据数据源创建字节输入流对象
//            File f = new File("D:\\project\\零一电科\\技术资料\\3、Vue2+Vue3全套教程\\img");
        Pattern pattern = Pattern.compile("(.+(?=\\.mp4))+");
        File f = new File("C:\\Users\\17517\\Videos\\bilibili\\Java");
        File[] fileArray = f.listFiles();
        System.out.println(f.listFiles());
        ArrayList<String> array = new ArrayList<String>();
        for (int i = 0; i <= fileArray.length - 1; i++) {
            Matcher matcher = pattern.matcher(fileArray[i].getName());
            while (matcher.find()){
                String name = matcher.group();
                String s1 = "files\\" + name + ".jpg";
                array.add(s1);
            }
 
//            array.add(s1);
        }
        System.out.println(array);
 
 
 
        FileInputStream fis = new FileInputStream("C:\\Users\\17517\\Pictures\\1.jpg");
        for(int i=0;i<array.size();i++){
            String s = array.get(i);
            FileOutputStream fos = new FileOutputStream(s);
            byte[] bys = new byte[1024];
            int len;
            while ((len=fis.read(bys))!=-1) {
                fos.write(bys,0,len);
            }
            fos.close();
        }
        fis.close();
    }}