package com.fastcampus.ch2;

import java.io.IOException;

import java.io.InputStream;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

public class RequestMessage {

@RequestMapping("/requestMessage")

public void main(HttpServletRequest request) throws Exception {

// 1. request line

String requestLine = request.getMethod(); // GET 또는 POST

requestLine += " " + request.getRequestURI(); // /ch2/requestMessage

String queryString = request.getQueryString(); // year=2021&month=10&day=1

requestLine += queryString == null ? "" : "?"+queryString;

requestLine += " " + request.getProtocol(); // HTTP/1.1

System.out.println(requestLine);

// 2. request headers

Enumeration<String> e = request.getHeaderNames();

while (e.hasMoreElements()) {

String name = e.nextElement();

System.out.println(name + ":" + request.getHeader(name));

}

// 3. request body - POST일 때만 해당, GET은 body가 없음(CONTENT_LENGTH=0)

final int CONTENT_LENGTH = request.getContentLength();

// System.out.println("content length="+CONTENT_LENGTH);

if(CONTENT_LENGTH > 0) {

byte[] content = new byte[CONTENT_LENGTH];

InputStream in = request.getInputStream();

in.read(content, 0, CONTENT_LENGTH);

System.out.println(); // empty line

System.out.println(new String(content, "utf-8")); // year=2021&month=10&day=1

} // if

} // main

}

[실행결과1] - GET 요청

GET /ch2/requestMessage?year=2021&month=10&day=1 HTTP/1.1 <--- 요청 라인(request line)

host:localhost:8080

connection:keep-alive

sec-ch-ua:"Chromium";v="94", "Google Chrome";v="94", ";Not A Brand";v="99"

sec-ch-ua-mobile:?0

sec-ch-ua-platform:"macOS"

upgrade-insecure-requests:1

user-agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36

accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9

sec-fetch-site:none

sec-fetch-mode:navigate

sec-fetch-user:?1

sec-fetch-dest:document

accept-encoding:gzip, deflate, br

accept-language:ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7

[실행결과2] - POST 요청

POST /ch2/requestMessage HTTP/1.1 <--- 요청 라인(request line)

host:localhost:8080

connection:keep-alive

content-length:90

sec-ch-ua:"Chromium";v="94", "Google Chrome";v="94", ";Not A Brand";v="99"

cache-control:no-cache

content-type:application/x-www-form-urlencoded

sec-ch-ua-mobile:?0

user-agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36

sec-ch-ua-platform:"macOS"

accept:*/*

origin:chrome-extension://coohjcphdfgbiolnekdpbcijmhambjff

sec-fetch-site:none

sec-fetch-mode:cors

sec-fetch-dest:empty

accept-encoding:gzip, deflate, br

accept-language:ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7

<--- empty line

year=2021&month=10&day=1 <--- request body