[网络协议]HTTP 简易服务器

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class HttpServer {
    public static void main(String[] args) {
        try {
            // 启动 HTTP 服务器端口监听
            ServerSocket serverSocket = new ServerSocket(80);

            while (true) {
                // 等待客户端连接到服务，客户端连接后返回一个新的socket
                Socket server = serverSocket.accept();

                // 获取网络的输入流，并将其转换为带有缓冲器的字符流
                InputStream inputStream = server.getInputStream();
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

                String requestHeaders;
                int contentLength = 0;

                // 客户端的请求格式
                while ((null != (requestHeaders = bufferedReader.readLine()))&& !requestHeaders.isEmpty()){
                    // 显示浏览器的请求头信息
                    System.out.println(requestHeaders);

                    if (requestHeaders.startsWith("GET")){
                        int begin = requestHeaders.indexOf(" ");
                        int end = requestHeaders.indexOf("HTTP");
                        String condition = requestHeaders.substring(begin, end);
                        System.out.println("GET 请求参数：" + condition);
                    }

                    if (requestHeaders.startsWith("Content-Length")){
                        int begin = requestHeaders.indexOf("Content-Length:") + "Content-Length:".length();
                        String postParameterLength = requestHeaders.substring(begin).trim();
                        contentLength = Integer.parseInt(postParameterLength);
                        System.out.println("Post 请求的参数的长度是：" + contentLength);
                    }
                }

                StringBuffer buffer = new StringBuffer();
                if (contentLength > 0){

                }

                OutputStream outputStream = server.getOutputStream();
                PrintWriter printWriter = new PrintWriter(outputStream);

                // 服务器的响应格式
                printWriter.println("HTTP/1.1 200 OK");
                printWriter.println("Content-Type: text/html;charset=utf-8");
                printWriter.println();
                printWriter.println("<h1>访问 HTTP 服务器 成功！</h1>");
                printWriter.flush();
                server.close();

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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