Java Socket Programming

套接字编程是进程之间通信的重要依赖。本章节将使用Java原生实现套接字通信程序。

本文档清晰的讲述了Silver Spork 这一程序的思路和开发过程。

• Document: https://guomaimang.github.io/note/cs/cn/java-socket-programming
• Demo: http://cn2322.hanjiaming.com.cn:8082
• Github: https://github.com/guomaimang/Silver-Spork

Background

Requirement

使用Java, 开发一个套接字程序 Silver Spork, 设计一个轻量的HTTP Server, 以实现使用HTTP协议的WEB服务, 功能类似Nginx。

• Use Java Muti-Thread to process socket
• Create a connection socket when contacted by a client (browser)
• Receive the HTTP request from this connection
• Parse the request to determine the specific file being requested
• Get the requested file from the server’s file system
• Proper request and responsemessage exchanges
• Create an HTTP response message consisting of the requested file preceded by header lines;
• Can't use the HTTPServer class directly
• Only process GET and HEAD request
• Only response HTTP1.1 200, 400, 404, 304
• Handle Last-Modified and If-Modified-Since headerfields
• Handle Connection: Keep-Aliveheader field

With

• A good summary.
• A clear README text file
• High quality.
• A full demonstration.

Environment

• 开发环境

  • Macos
  • Java 17
  • Intelj idea 2021

• 测试环境

  • 
  • Postman
  • Chrome dev100
  • IPv4 + IPv6

Organization

File

• Public: Storing static website pages
• src: Storing Java source code
  • HttpServer.java: Program Ontology, also Launcher
    • class->clock: Executable, timing stop process
    • class->worker: Handler for single socket
  • Request.Java: Parsing the incoming Request message
  • Response.Java: Sending messages based on Response
  • Logger.java: Take down the log

Configurable global variables

• serverRoot: Specifies the location where the static site files are stored, i.e. the root directory of the site.
  • Default is "public"
  • The site owner can place files in this directory
• port: Server socket port
  • Default is 8080
• logger: set the location of log file
  • Default is "log.txt"

Advantage

• 必要的日志记录。
• 使用原生Java，从socket开始开发。没有使用任何现有的httpServer库。
• 可拓展性强。使用Java进行模块化开发。有利于功能拓展和二次开发。
• 开发规范。
  • 注释清晰。
  • 例如使用Java beans设置变量。
  • 没有无用的接口。
  • 没有使用危险函数/方法。

Reference

https://docs.oracle.com/javase/tutorial/networking/sockets/clientServer.html

https://blog.csdn.net/allway2/article/details/120255402

https://www.runoob.com/java/java-networking.html

https://nginx.org/en/