# GET vs POST
웹브라우저와 서버 간에 정보를 주고 받을 때 사용하는 전송방식
- get : url에 데이터가 표시됨, 정보 크기의 제한이 있음
- post : url에 데이터가 표시되지 않아 보안성이 좋음, 정보 크기의 제한이 없음
Q1. getTest.html에서 이름과 비밀번호를 입력받아 getTest.jsp에서 이름과 비밀번호를 출력하시오. (get방법)
A.
- getTest.html
<html> <head> <title>회원가입</title> </head> <body> <form method = "get" action="getTest.jsp"> <table border="1"> <caption>회원가입</caption> <tr> <td> <label for="name">이름</label> </td> <td> <input type="text" name="name" id="name" required> </td> </tr> <tr> <td> <label for="pw">비밀번호</label> </td> <td> <input type="text" name="pw" id="pw" required> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="전송"> <input type="reset" value="초기화"> </td> </tr> </table> </form> </body> </html>
- getTest.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <% String name = request.getParameter("name"); String pw = request.getParameter("pw"); %> 이름 : <%= name %> 비밀번호 : <%= pw %> </body> </html>
Q2. getTest2.html에서 getTest2라는 링크를 클릭하면 getText2.jsp로 이동해서 이름과 비밀번호를 출력하시오.
이름과 비밀번호는 url에 같이 보내시오.(get방법)
A.
- getTest2.html
<html> <head> <title>회원가입</title> </head> <body> <a href="http://localhost:8080/getTest2.jsp?name=jhn&pw=1234">getTest2</a> </body> </html>
- getTest2.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <% String name = request.getParameter("name"); String pw = request.getParameter("pw"); %> 이름 : <%= name %> 비밀번호 : <%= pw %> </body> </html>
Q3. postTest.html에서 이름과 비밀번호를 입력받아 postTest.jsp에서 출력하시오. (post방법)
A.
- postTest.html
<html> <head> <title>회원가입</title> </head> <body> <form method = "post" action="postTest.jsp"> <table border="1"> <caption>회원가입</caption> <tr> <td> <label for="name">이름</label> </td> <td> <input type="text" name="name" id="name" required> </td> </tr> <tr> <td> <label for="pw">비밀번호</label> </td> <td> <input type="text" name="pw" id="pw" required> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="전송"> <input type="reset" value="초기화"> </td> </tr> </table> </form> </body> </html>
- postTest.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <% String name = request.getParameter("name"); String pw = request.getParameter("pw"); %> 이름 : <%= name %> 비밀번호 : <%= pw %> </body> </html>
Q4. postTest2.html에서 이름을 입력받고, 숨김정보로 007이라는 값을 postTest2.jsp로 보내시오.
그리고 이름과 숨김정보를 출력하시오.
A.
- postTest2.html
<html> <head> <title>회원가입</title> </head> <body> <form method = "post" action="postTest.jsp"> <input type="hidden" name="hidden" value="007"> <table border="1"> <caption>회원가입</caption> <tr> <td> <label for="name">이름</label> </td> <td> <input type="text" name="name" id="name" required> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="전송"> <input type="reset" value="초기화"> </td> </tr> </table> </form> </body> </html>
- postTest2.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <% String name = request.getParameter("name"); String hidden = request.getParameter("hidden"); %> 이름 : <%= name %> 숨김 값 : <%= hidden %> </body> </html>
# insert
create table member( num int auto_increment primary key, name varchar(20), id varchar(20), pw varchar(20) );
Q. Input.html에서 이름, 아이디, 비밀번호를 입력받아서 InputOK.jsp에서 저장을 하시오.
저장이 성공적으로 이루어 졌으면 welcome.html로 이동하고 실패했으면 fail.html로 이동하시오.
A. Input.html
<html> <head> <title>회원가입</title> </head> <body> <form method = "post" action="inputOK.jsp"> <table border="1"> <caption>회원가입</caption> <tr> <td> <label for="name">이름</label> </td> <td> <input type="text" name="name" id="name" required> </td> </tr> <tr> <td> <label for="name">아이디</label> </td> <td> <input type="text" name="id" id="id" required> </td> </tr> <tr> <td> <label for="name">비밀번호</label> </td> <td> <input type="text" name="pw" id="pw" required> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="전송"> </td> </tr> </table> </form> </body> </html>
- inputOK.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.sql.Connection" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.SQLException" %> <%@ page import="java.sql.Statement" %> <%@ page import="java.sql.ResultSet" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <% String url = "jdbc:mysql://localhost:3306/project?serverTimezone=UTC&characterEncoding=UTF-8"; String id = "root"; String pw = "1234"; Connection conn = null; Statement stmt = null; PreparedStatement pstmt = null; String sql = null; ResultSet rs = null; try { Class.forName("com.mysql.cj.jdbc.Driver"); conn = DriverManager.getConnection(url, id, pw); System.out.println("Connection 객체 생성 성공"); stmt = conn.createStatement(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { System.out.println("Connection 객체 생성 실패"); } request.setCharacterEncoding("utf-8"); String name, id, pw = null; int result = 0; name = request.getParameter("name"); id = request.getParameter("id"); pw = request.getParameter("pw"); sql = "insert into member(name, id, pw) values(?, ?, ?)"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, name); pstmt.setString(2, id); pstmt.setString(3, pw); result = pstmt.executeUpdate(); if(result > 0) { response.sendRedirect("/coderbear/welcome.jsp"); } else { response.sendRedirect("/coderbear/fail.jsp"); } %> </body> </html>
#select
Q. showMember.html에서 멤버보기 링크를 클릭하면 showMember.jsp에서 등록되어 있는 멤버를 보여주시오.
A.
- showMember.html
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <html> <head> <title></title> </head> <body> <a href ="showMember.jsp">멤버보기</a> </body> </html>
- showMember.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <html> <head> <title></title> </head> <body> <table border="1"> <caption>목록</caption> <tr> <td>번호</td> <td>이름</td> <td>아이디</td> </tr> <% sql = "select * from member"; rs = stmt.executeQuery(sql); int no; String name, id = null; while(rs.next()) { no = rs.getInt("no"); name = rs.getString("name"); id = rs.getString("id"); %> <tr> <td><%= no %></td> <td><%= name %></td> <td><%= id %></td> </tr> <% } %> </table> </body> </html>
ex) 게시판 만들기
Q. 아래와 같이 구현하시오.
A.
- dbconn.jsp
<%@page import="java.sql.PreparedStatement"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.sql.Connection" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.SQLException" %> <%@ page import="java.sql.Statement" %> <%@ page import="java.sql.ResultSet" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <% String url = "jdbc:mysql://localhost:3306/project?serverTimezone=UTC&characterEncoding=UTF-8"; String id = "root"; String pw = "1234"; Connection conn = null; Statement stmt = null; PreparedStatement pstmt = null; String sql = null; ResultSet rs = null; try { Class.forName("com.mysql.cj.jdbc.Driver"); // 데이터베이스와 연결하는 드라이버 클래스를 찾아 로드한다. conn = DriverManager.getConnection(url, id, pw); // 연결을 관리하는 Connection 객체를 생성한다. System.out.println("Connection 객체 생성 성공"); stmt = conn.createStatement(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { System.out.println("Connection 객체 생성 실패"); } %> </body> </html>
- index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ include file="dbconn.jsp"%> <html> <head> <title>회원가입</title> </head> <body> <table border="1"> <caption>목록</caption> <tr> <td>번호</td> <td>제목</td> <td>작성자</td> <td>작성일</td> <td>조회 수</td> </tr> <% sql = "select * from board"; rs = stmt.executeQuery(sql); int no, rCnt; String name, title, contents, wTime = null; while(rs.next()) { no = rs.getInt("no"); name = rs.getString("name"); title = rs.getString("title"); contents = rs.getString("contents"); wTime = rs.getString("wTime"); rCnt = rs.getInt("rCnt"); %> <tr> <td><%= no %></td> <td><a href="/haena/contents.jsp?no=<%= no %>"><%= title %></a></td> <td><%= name %></td> <td><%= wTime %></td> <td><%= rCnt %></td> </tr> <% } %> </table> <a href="write.jsp">글쓰기</a> </body> </html>
- write.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <form method="post" action="writeResult.jsp"> <table border="1"> <caption>글쓰기</caption> <tr> <td>제목</td> <td><input type="text" name="title"></td> </tr> <tr> <td>이름</td> <td><input type="text" name="name"></td> </tr> <tr> <td>비밀번호</td> <td><input type="password" name="password"></td> </tr> <tr> <td>E-mail</td> <td><input type="text" name="email"></td> </tr> <tr> <td colspan="2"> <textarea name="contents" cols="40" rows="8"></textarea> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="등록"> <a href="/Haena/index.jsp"><input type="button" value="목록"></a> </td> </tr> </table> </form> </body> </html>
- writeResult.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ include file="dbconn.jsp"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <% request.setCharacterEncoding("utf-8"); String title = request.getParameter("title"); String name = request.getParameter("name"); String password = request.getParameter("password"); String email = request.getParameter("email"); String contents = request.getParameter("contents"); sql = "INSERT INTO BOARD(title, name, password, email, contents) VALUES(?, ?, ?, ?, ?)"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, title); pstmt.setString(2, name); pstmt.setString(3, password); pstmt.setString(4, email); pstmt.setString(5, contents); int result = 0; result = pstmt.executeUpdate(); if(result > 0) { System.out.println(result + " 데이터 삽입성공"); %> <script type="text/javascript"> alert("글쓰기가 완료되었습니다."); </script> <% response.sendRedirect("/Haena/index.jsp"); } else { System.out.println(result + " 데이터 삽입실패"); %> <% response.sendRedirect("/Haena/write.jsp"); } %> </body> </html>
- contents.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ include file="dbconn.jsp"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <% int no = Integer.parseInt(request.getParameter("no")); sql = "select * from board where no="+no+""; String sql2 = "update board set rCnt = rCnt+1 where no=? "; PreparedStatement pstmt2 = conn.prepareStatement(sql2); pstmt2.setInt(1, no); int result2 = pstmt2.executeUpdate(); if(result2 > 0) { System.out.println("조회 수가 올라갔습니다."); } rs = stmt.executeQuery(sql); %> <table border="1"> <% while(rs.next()) { String title = rs.getString("title"); String name = rs.getString("name"); String contents = rs.getString("contents"); String wTime = rs.getString("wTime"); %> <caption>내용보기</caption> <tr> <td>제목</td> <td><input type="text" name="title" value="<%= title %>" readOnly></td> </tr> <tr> <td>이름</td> <td><input type="text" name="name" value="<%= name %>" readOnly></td> </tr> <tr> <td>작성일</td> <td><input type="text" name="wTime" value="<%= wTime %>" readOnly></td> </tr> <tr> <td colspan="2"> <textarea name="contents" cols="40" rows="8" readOnly><%= contents %></textarea> </td> </tr> <% } %> </table> <a href="/board2/index.jsp"><input type="button" value="목록"></a> <a href="/board2/updatePwd.jsp?no=<%= no %>"><input type="button" value="수정"></a> <a href="/board2/delete.jsp?no=<%= no %>"><input type="button" value="삭제"></a> </body> </html>
- updatePwd.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <% request.setCharacterEncoding("utf-8"); System.out.println(request.getParameter("no")); int no = Integer.parseInt(request.getParameter("no")); %> <form method="post" action="update.jsp"> <input type="hidden" name="no" value="<%= no %>"> <table> <tr> <td> 비밀번호 </td> <td> <input type="password" name="password"> </td> </tr> <tr> <td><input type="submit" value="확인"></td> </tr> </table> </form> </body> </html>
- update.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ include file="dbconn.jsp"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <% request.setCharacterEncoding("utf-8"); int no = Integer.parseInt(request.getParameter("no")); String password = request.getParameter("password"); sql = "select * from board where no="+no+""; rs = stmt.executeQuery(sql); while(rs.next()) { if(!password.equals(rs.getString("password"))) { System.out.println(password); System.out.println(rs.getString("password")); %> <div> 비밀번호가 다릅니다. <a href="/Haena/index.jsp">목록</a> </div> <% } else { String title = rs.getString("title"); String name = rs.getString("name"); String contents = rs.getString("contents"); String wTime = rs.getString("wTime"); %> <form method="post" action="updateResult.jsp"> <input type="hidden" name="no" value="<%= no %>"> <table border="1"> <caption>내용보기</caption> <tr> <td>제목</td> <td><input type="text" name="title" value="<%= title %>"></td> </tr> <tr> <td>이름</td> <td><input type="text" name="name" value="<%= name %>"></td> </tr> <tr> <td>작성일</td> <td><input type="text" name="wTime" value="<%= wTime %>" readOnly></td> </tr> <tr> <td colspan="2"> <textarea name="contents" cols="40" rows="8"><%= contents %></textarea> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="등록"> <a href="/Haena/index.jsp"><input type="button" value="목록"></a> </td> </tr> </table> </form> <% } } %> </body> </html>
- updateResult.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ include file="dbconn.jsp"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <% request.setCharacterEncoding("utf-8"); int no = Integer.parseInt(request.getParameter("no")); String title = request.getParameter("title"); String name = request.getParameter("name"); String contents = request.getParameter("contents"); sql = "UPDATE BOARD SET title=?, name=?, contents=?, wTime=now() WHERE no=?"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, title); pstmt.setString(2, name); pstmt.setString(3, contents); pstmt.setInt(4, no); int result = 0; result = pstmt.executeUpdate(); if(result > 0) { System.out.println(result + " 데이터 수정성공"); %> <script type="text/javascript"> alert("글이 수정되었습니다."); </script> <% response.sendRedirect("/Haena/index.jsp"); } else { System.out.println(result + " 데이터 수정실패"); %> <% response.sendRedirect("/Haena/update.jsp"); } %> </body> </html>
- delete.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ include file="dbconn.jsp"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <% request.setCharacterEncoding("utf-8"); int no = Integer.parseInt(request.getParameter("no")); sql = "DELETE FROM BOARD WHERE no=?"; pstmt = conn.prepareStatement(sql); pstmt.setInt(1, no); int result = 0; result = pstmt.executeUpdate(); if(result > 0) { System.out.println(result + " 데이터 삭제성공"); response.sendRedirect("/Haena/index.jsp"); } else { System.out.println(result + " 데이터 삭제실패"); response.sendRedirect("/Haena/index.jsp"); } %> </body> </html>
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