手写简易的web服务器（理解BS架构和CS架构）

package com.csdn.http;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class WebServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(8899);

        while (true) {
            Socket clientSocket = serverSocket.accept();

            //接收客户端发送过来的数据
            InputStream inputStream = clientSocket.getInputStream();
            byte[] bytes = new byte[1024];

            int length = inputStream.read(bytes);
            System.out.println(new String(bytes, 0, length));
            clientSocket.shutdownInput();

            //给客户端返回数据
            OutputStream outputStream = clientSocket.getOutputStream();

            //服务器在返回内容之前，要先返回响应头
            outputStream.write("HTTP/1.1 200 OK\r\n".getBytes());//每个响应头后面都要有一个换行
            outputStream.write("Date: Fri, 20 Oct 2023 12:54:09 GMT\r\n".getBytes());
            outputStream.write("Content-type:text/html;charset=utf-8\r\n".getBytes());

            //所以的响应头全部写完以后，再写一个换行
            outputStream.write("\r\n".getBytes());

            //服务器返回的内容
            outputStream.write("<h1 style='color:red'>我是服务器返回的内容</h1>".getBytes());

//            clientSocket.shutdownInput();

            clientSocket.close();
        }

    }
}
D:\Java\jdk-17\bin\java.exe
GET / HTTP/1.1
Host: 192.168.14.55:8899
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36 Edg/118.0.2088.46
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9


GET /favicon.ico HTTP/1.1
Host: 192.168.14.55:8899
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36 Edg/118.0.2088.46
Accept: image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8
Referer: http://192.168.14.55:8899/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9

1、BS架构

• 下面我以 Microsoft Edge 为例，访问我们的服务器
• 用浏览器访问 web 服务器，服务器控制台打印的内容是 浏览器 响应 的内容

2、CS架构

• 我会用一个小工具代表我们的 客户端 ，这个小工具是 NetAssist V4.3.13 版本的网络调试助手
• 由于 IDEA 软件用的是 UTF-8 编码 所以 我们把 网络调试助手 软件 改为 接收编码为 UTF-8 ，防止我们接收服务器发过来的内容乱码