Java 简单实现HTTP服务器

HTTP服务器

  解释： 个人理解，http服务器就是解析http请求信息，并解析信息；然后根据信息做后续事情。

Http请求格式与响应格式

 

 核心代码

   

package com_2.Httpserver;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * @Description: //TODO  简单的HTTP服务器， 其实就是接受HTTP请求，并解析请求，
 * @Author: sunfch
 * @Date: 2019/1/3 16:35
 * @Param:
 * @Return:
 */
public class HttpServer {

    public static void main(String[] args) {
        try {

            /*监听端口号，只要是8888就能接收到*/
            ServerSocket ss = new ServerSocket(8888);

            while (true) {
                /*实例化客户端，固定套路，通过服务端接受的对象，生成相应的客户端实例*/
                Socket socket = ss.accept();
                /*获取客户端输入流，就是请求过来的基本信息：请求头，换行符，请求体*/
                BufferedReader bd = new BufferedReader(new InputStreamReader(socket.getInputStream()));

                /**
                 * 接受HTTP请求，并解析数据
                 */
                String requestHeader;
                int contentLength = 0;
                while ((requestHeader = bd.readLine()) != null && !requestHeader.isEmpty()) {
                    System.out.println(requestHeader);
                    /**
                     * 获得GET参数
                     */
                    if (requestHeader.startsWith("GET")) {
                        int begin = requestHeader.indexOf("/?") + 2;
                        int end = requestHeader.indexOf("HTTP/");
                        String condition = requestHeader.substring(begin, end);
                        System.out.println("GET参数是：" + condition);
                    }
                    /**
                     * 获得POST参数
                     * 1.获取请求内容长度
                     */
                    if (requestHeader.startsWith("Content-Length")) {
                        int begin = requestHeader.indexOf("Content-Lengh:") + "Content-Length:".length();
                        String postParamterLength = requestHeader.substring(begin).trim();
                        contentLength = Integer.parseInt(postParamterLength);
                        System.out.println("POST参数长度是：" + Integer.parseInt(postParamterLength));
                    }
                }
                StringBuffer sb = new StringBuffer();
                if (contentLength > 0) {
                    for (int i = 0; i < contentLength; i++) {
                        sb.append((char) bd.read());
                    }
                    System.out.println("POST参数是：" + sb.toString());
                }
                /*发送回执*/
                PrintWriter pw = new PrintWriter(socket.getOutputStream());

                pw.println("HTTP/1.1 200 OK");
                pw.println("Content-type:text/html");
                pw.println();
                pw.println("<h1>successful</h1>");

                pw.flush();
                socket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

输出信息： 

GET /sun=sunfengchuan HTTP/1.1
GET参数是：ET /sun=sunfengchuan 
Host: localhost:8888
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/66.0.3359.139 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: ticket=610090C008FE4A4B8B62BE9399230FDD
GET /favicon.ico HTTP/1.1
GET参数是：ET /favicon.ico 
Host: localhost:8888
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36
Accept: image/webp,image/apng,image/*,*/*;q=0.8
Referer: http://localhost:8888/sun=sunfengchuan
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: ticket=610090C008FE4A4B8B62BE9399230FDD
Disconnected from the target VM, address: '127.0.0.1:8888', transport: 'socket'