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'