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    • 8. form 데이터 처리
      JSP/실전 JSP 2022. 11. 5. 01:12

      8-1. form 태그 

      Browser -> DATA (Request) -> 웹 컨테이너 (tomcat)

      form 관련 태그(USER DATA) -> request 객체 (USER DATA)

       

      8-2. doPost  & doGet

      doPost 

      • 데이터가 HTTP Request에 포함되어 웹 서버로 전송되어 보안에 강하다.
      • method="post" (form 관련 태그) -> doPost() (request 객체)
      • 데이터가 헤더파일에 암호화되어 전송되어서 보안에 강하다.
      • 로그인, 회원가입, 설문조사 등등 post 방식
      • ex) http://localhost:8090/lee/mSignUp (맵핑 정보만 노출)

       

      doGet 

      • 데이터가 웹 브라우저 URL에 노출되어 웹 서버로 전송되어 보안에 약하다.
      • method="get" (form 관련 태그) -> doGet() (request 객체)
      • URL의 길이에 한계가 있음, 너무많은 데이터를 보내기에 부적절
      • ex) http://localhost:8090/lee/mSignUp?m_name=Hong+gildong...

       

       

      MemSignUp.java (서블릿)

      package com.servlet;

import java.io.IOException;
import java.util.Arrays;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/mSignUp")
public class MemSignUp extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		System.out.println(" -- doGet() -- ");
		
		String m_name = request.getParameter("m_name");
		String m_pass = request.getParameter("m_pass");
		String m_gender = request.getParameter("m_gender");
		String[] m_hobbys = request.getParameterValues("m_hobby");
		String m_residence = request.getParameter("m_residence");
		
		System.out.println("m_name : " + m_name);
		System.out.println("m_pass : " + m_pass);
		System.out.println("m_gender : " + m_gender);
		System.out.println("m_hobbys : " + Arrays.toString(m_hobbys));
		System.out.println("m_residence : " + m_residence);
		
		Enumeration<String> names = request.getParameterNames();
		while (names.hasMoreElements()) {
			String name = (String) names.nextElement();
			System.out.println("name : " + name);
		}
		
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		System.out.println(" -- doPost() -- ");
		
		doGet(request, response);
	}

}
      • request.getParameter("파라미터") - 모든정보가 들어있는 request객체에서 어떠한 정보를 빼낼 때 사용, 파라미터는 html파일의 form태그의 name 속성 값
      • request.getParameterValues("파라미터")  - 여러가지의 데이터를 받을 때  배열로 받을 수있음
      • request.getParameterNames() - 프론트 쪽에서 서버로 날라오는 속성 값을 알고 싶을 때 사용

       

       

      formEx.html (POST 방식)

      <!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>

	<form action="mSignUp" method="post">
		name : <input type="text" name="m_name"> </br>
		password : <input type="password" name="m_pass"></br>
		gender : Man<input type="radio" name="m_gender" value="M" checked="checked">, Woman<input type="radio" name="m_gender" value="W"></br>
		hobby : Sport<input type="checkbox" name="m_hobby" value="sport">, 
				Cooking<input type="checkbox" name="m_hobby" value="cooking">, 
				Reading<input type="checkbox" name="m_hobby" value="reading">,
				Travel<input type="checkbox" name="m_hobby" value="travel"></br>
		residence : <select name="m_residence">
						<option value="seoul" selected="selected">Seoul</option>
						<option value="gyeonggi">Gyeonggi</option>
						<option value="chungcheong">Chungcheong</option>
						<option value="jeonra">Jeonra</option>
						<option value="jeju">Jeju</option>
						<option value="gyeongsang">Gyeongsang</option>
						<option value="gangwon">Gangwon</option>
					</select></br>
					<input type="submit" value="sign up">
	</form>

</body>
</html>

       

      formEx.html
      맵핑 정보만 노출

       

       

      formEx.html (GET 방식)

      <!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>

	<form action="mSignUp" method="get">
		name : <input type="text" name="m_name"> </br>
		password : <input type="password" name="m_pass"></br>
		gender : Man<input type="radio" name="m_gender" value="M" checked="checked">, Woman<input type="radio" name="m_gender" value="W"></br>
		hobby : Sport<input type="checkbox" name="m_hobby" value="sport">, 
				Cooking<input type="checkbox" name="m_hobby" value="cooking">, 
				Reading<input type="checkbox" name="m_hobby" value="reading">,
				Travel<input type="checkbox" name="m_hobby" value="travel"></br>
		residence : <select name="m_residence">
						<option value="seoul" selected="selected">Seoul</option>
						<option value="gyeonggi">Gyeonggi</option>
						<option value="chungcheong">Chungcheong</option>
						<option value="jeonra">Jeonra</option>
						<option value="jeju">Jeju</option>
						<option value="gyeongsang">Gyeongsang</option>
						<option value="gangwon">Gangwon</option>
					</select></br>
					<input type="submit" value="sign up">
	</form>

</body>
</html>

      데이터가 웹 브라우저 URL에 노출

       

      'JSP > 실전 JSP' 카테고리의 다른 글

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      11. JSP 내장 객체  (0) 2022.11.05
      10. JSP request, response  (0) 2022.11.05
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