Lesson: Overview of Networking课程：网络概述

Before plowing through the examples in the next several lessons, you should have an understanding of some networking basics. 在阅读下几节课中的示例之前，您应该了解一些网络基础知识。Also, to boost your confidence, we've included a section that reviews what you may already know about networking in Java without even realizing it.此外，为了增强您的信心，我们还包括了一节，回顾了您可能已经知道的Java网络的知识，而您甚至没有意识到这一点。

What You May Already Know About Networking in Java您可能已经了解Java中的网络

If you've been working on the other trails in this tutorial, you've probably loaded an applet over the Internet by now, and you've likely loaded images from the network into applets running over the network. 如果您一直在学习本教程中的其他教程，那么您现在可能已经通过Internet加载了一个小程序，并且您可能已经将网络中的图像加载到了通过网络运行的小程序中。All of this is using the network and you already know how to do it. 所有这些都是在使用网络，你已经知道怎么做了。This page highlights the networking features that are covered in other trails and lessons of this tutorial—features that you might already be familiar with—and provides links to the pages that discuss those features.本页重点介绍本教程其他教程和课程中介绍的网络功能—您可能已经熟悉的功能—并提供讨论这些功能的页面链接。

Networking Basics网络基础

You'll learn what you need to know about TCP, UDP, sockets, datagrams, and ports to get the most out of the remaining lessons in this trail. 您将了解有关TCP、UDP、套接字、数据报和端口的必要知识，以充分利用本教程中的剩余课程。If you are already familiar with these concepts, feel free to skip this section.如果您已经熟悉这些概念，请跳过本节。