Java实现时间日期服务器，学习一下java定义端口号，设置客户端套接字，实例化套按字，得到输入流，读入数据到缓冲区，输出错误信息等。-Java date and time server, learn about the java-defined port number, set the client socket, instance of the word, the input stream to read data to the buffer output error message.