说明并尝试通过URL从服务器上读取一个文本文件，并显示该文本文件的内容。 5. 编写程序，用Socket通信机制在服务器和客户端之间传输文件。(Describes and attempts to read a text file from the server through a URL and display the contents of the text file. 5. Write a program and use socket communication mechanism to t