java复制文件夹中的所有文件和文件夹到另一个文件夹中

1.复制文件夹

public static void copyDir(String sourcePath, String newPath) throws IOException {
        File file = new File(sourcePath);
        String[] filePath = file.list();
        
        if (!(new File(newPath)).exists()) {
            (new File(newPath)).mkdir();
        }
        
        for (int i = 0; i < filePath.length; i++) {
            if ((new File(sourcePath + file.separator + filePath[i])).isDirectory()) {
                copyDir(sourcePath  + file.separator  + filePath[i], path  + file.separator + filePath[i]);
            }
            
            if (new File(sourcePath  + file.separator + filePath[i]).isFile()) {
                copyFile(sourcePath + file.separator + filePath[i], path + file.separator + filePath[i]);
            }
            
        }
    }

2. 复制文件的方法

public static void copyFile(String oldPath, String newPath) throws IOException {
        File oldFile = new File(oldPath);
        File file = new File(newPath);
        FileInputStream in = new FileInputStream(oldFile);
        FileOutputStream out = new FileOutputStream(file);;

        byte[] buffer=new byte[2097152];
        int readByte = 0;
        while((readByte = in.read(buffer)) != -1){
            out.write(buffer, 0, readByte);
        }
    
        in.close();
　　　　 out.close();
    }

3.调用方法

public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入源目录：");
        String sourcePath = sc.nextLine();
        System.out.println("请输入新目录：");
        String path = sc.nextLine();
        
        //String sourcePath = "D://aa";
        //String path = "D://bb";
        
        copyDir(sourcePath, path);
    }