[Spring MVC] 서블릿 - HttpServletResponse 기본 사용법

HttpServletResponse - 기본 사용법

HttpServletResponse 역할

 

HTTP 응답 메시지 생성

• HTTP 응답 코드 지정
• 헤더 생성
• 바디 생성

 

편의 기능 제공

• Content-Type, 쿠키, Redirect

 

 

HttpServletResponse - 기본 사용법

 

hello.servlet.basic.response.ResponseHeaderServlet

package hello.servlet.basic.response;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "responseHeaderServlet", urlPatterns = "/response-header")
public class ResponseHeaderServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //[status-line]
        response.setStatus(HttpServletResponse.SC_OK); //HTTP 응답코드

        //[response-header]
//        response.setHeader("Content-Type", "text/plain;charset=utf-8");
        response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
        response.setHeader("Pragma", "no-cache");
        response.setHeader("my-header", "hello");

        //[Header 편의 메서드]
//        content(response);
//        cookie(response);
//        redirect(response);

        PrintWriter writer = response.getWriter();
        writer.println("ok");
    }
}

 

Content 편의 메서드

private void content(HttpServletResponse response) {
        //Content-Type: text/plain;charset=utf-8
        //Content-Length: 2
        //response.setHeader("Content-Type", "text/plain;charset=utf-8");
        response.setContentType("text/plain");
        response.setCharacterEncoding("utf-8");
        //response.setContentLength(2); //(생략시 자동 생성)
}

 

쿠키 편의 메서드

private void cookie(HttpServletResponse response) {
        //Set-Cookie: myCookie=good; Max-Age=600;
        //response.setHeader("Set-Cookie", "myCookie=good; Max-Age=600");
        Cookie cookie = new Cookie("myCookie", "good");
        cookie.setMaxAge(600); //600초
        response.addCookie(cookie);
}

 

Redirect 편의 메서드

private void redirect(HttpServletResponse response) throws IOException {
        //Status Code 302
        //Location: /basic/hello-form.html
        //response.setStatus(HttpServletResponse.SC_FOUND); //302
        //response.setHeader("Location", "/basic/hello-form.html");
        response.sendRedirect("/basic/hello-form.html");
}

 

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출처 : https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-mvc-1