java编写的具有聊天功能和和文件传递功能的源代码，内部有文档，说明非常详细，希望对大家有所帮助，也希望能提出宝贵意见。-java prepared and have a chat and file transfer function of the source code, internal documentation, very detailed descr iption, and they hope to be helpful to everyone, but also wish to pu