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[Java/JSP] Servlet을 이용하여 로그인페이지 만들기(DB연동) 본문
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SMALL
loginFrm.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>
<h3>로그인</h3>
<form action="loginProc.do" method="post">
<table border="1">
<tr>
<td>아이디</td>
<td>
<input type="text" name="userId" />
</td>
</tr>
<tr>
<td>비밀번호</td>
<td><input type="password" name="userPwd" /></td>
</tr>
<tr><td colspan="2" style="text-align:center;"><input type="submit" value="로그인" /></td></tr>
</table>
</form>
</body>
</html>
LoginProc.java
package org.global.controller;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
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 javax.servlet.http.HttpSession;
/**
* Servlet implementation class LoginProc
*/
@WebServlet("/member/loginProc.do")
public class LoginProc extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginProc() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("doPost");
actionDo(request, response);
}
private void actionDo(HttpServletRequest request, HttpServletResponse response) throws IOException {
System.out.println("actionDo");
try{
request.setCharacterEncoding("utf-8");
String userId = request.getParameter("userId");
String userPwd = request.getParameter("userPwd");
String url = "jdbc:mysql://localhost:3306/testdb?useSSL=false";
String dbId = "root", dbPwd = "1234";
Connection conn = null;
String sql = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
Class.forName("com.mysql.cj.jdbc.Driver");
conn = DriverManager.getConnection(url, dbId, dbPwd);
sql = "select * from member where userId=? and userPwd=?";
//out.print(sql);
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, userId);
pstmt.setString(2, userPwd);
rs = pstmt.executeQuery(); //select문만 resultSet으로 처리할 수 있다
String sqlId = "";
String sqlPwd = "";
while(rs.next()){
sqlId = rs.getString("userId");
sqlPwd = rs.getString("userPwd");
}
if(userId.equals(sqlId) && userPwd.equals(sqlPwd)){
HttpSession httpSession = request.getSession();
httpSession.setAttribute("userId", sqlId);
httpSession.setAttribute("userPwd", sqlPwd);
response.sendRedirect("loginResult.jsp");
}else{
response.sendRedirect("loginFrm.jsp");
}
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch(SQLException e){
e.printStackTrace();
}finally{
//conn.close();
}
}
}
로그인이 정상적으로 처리되면 loginResult.jsp로 이동
비정상적으로 처리되면 loginFrm.jsp로 이동한다.
loginResult.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>
${userId }님 안녕하세요<br>
<a href="">회원정보 수정</a>
</body>
</html>
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