写一个服务器，要求根据用户 输入文件路径（要求用户可以输入一个文件，或文件夹路径，注意要是文件夹，可能文件夹中还嵌套这文件夹）中找出文件里面里面存放的用户指定信息（比如邮箱） ，并把找出的信息（比如邮箱）保存到一个用户指定的文本文件中。-Write a server requires users to enter a file path (the user can enter a file or folder path Note that if the folder may also be nested folder this folder) to find the file which is stored inside the user-specified information (such as mail), and find out information (such as mailbox) is saved to a user-specified text file.