Intellij JSP - JavaBean Example (자바빈 저장을 이용한 로그인 예제)

2 minute read

JavaBean Example (자바빈 저장을 이용한 로그인 예제)

Project - JavaBeanLoginEx

User.java

  // 객체 직렬화를 위해선 Serializable를 구현해야 함
  public class User implements Serializable {
          String name;
          String id;
          String pw;
          String email;
				
          public User() {
          }

          public User(String name, String id, String pw, String email) {
                  this.name = name;
                  this.id = id;
                  this.pw = pw;
                  this.email = email;
          }

          // getter, setter 생략
  }

login.jsp

  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
  <head>
          <title>Title</title>
  </head>
  <body>
  <form action="login_process.jsp" method="post">
          <table>
                  <tr>
                          <td>ID :</td>
                          <td><input type="text" name="id"></td>
                  </tr>

                  <tr>
                          <td>Password :</td>
                          <td><input type="password" name="pw"></td>
                  </tr>
          </table>
          <input type="submit" value="로그인"> <input type="button" value="회원 가입" onclick="location.href='join.html'">
  </form>
  </body>
  </html>

join.html

  <!DOCTYPE html>
  <html lang="en">
  <head>
          <meta charset="UTF-8">
          <title>textform</title>
          <style>
                  table {
                          /*width: 100%;*/
                          border: 1px solid #444444;
                          margin-left: auto;
                          margin-right: auto;
                  }

                  td {
                          /*width: 100%;*/
                          /*border: 1px solid #444444;*/
                  }

                  .c {
                          text-align: center;
                  }

          </style>
  </head>
  <body>

  <h2 class="c">회원 가입</h2>
  <form action="join_process.jsp" method="post" name="textform">
          <table>

                  <tr>
                          <td>이름<br/></td>
                          <td><input type="text" name="name"></td>
                  </tr>

                  <tr>
                          <td>ID :</td>
                          <td><input type="text" name="id"></td>
                  </tr>

                  <tr>
                          <td>Password :</td>
                          <td><input type="password" name="pw"></td>
                  </tr>

                  <tr>
                          <td>이메일<br/></td>
                          <td><input type="text" name="email"></td>
                  </tr>
          </table>
          <br/>
          <div class="c">
                  <input type="submit" value="회원 가입">
                  <input type="reset" value="초기화">
          </div>
  </form>
  </body>
  </html>

join_process.jsp

  <%@ page import="java.io.FileOutputStream" %>
  <%@ page import="java.io.ObjectOutputStream" %>
  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <jsp:useBean id="user" class="beans.User" scope="page"/>
  <jsp:setProperty name="user" property="*"/>
  <html>
  <head>
  </head>
  <body>
  <%
          String realPath = application.getRealPath("/users/user_" + user.getId());
          FileOutputStream fos = new FileOutputStream(realPath);
          ObjectOutputStream oos = new ObjectOutputStream(fos);
          oos.writeObject(user);
          oos.close();
  %>

  <h2>회원 가입 처리 완료</h2><br/>
  이름 : <jsp:getProperty name="user" property="name"/><br/>
  ID : <jsp:getProperty name="user" property="id"/><br/>
  PW : <jsp:getProperty name="user" property="pw"/><br/>
  Email : <jsp:getProperty name="user" property="email"/><br/><br/>
  <button onclick="location.href='login.jsp'">Login Page</button>

  </body>
  </html>

login_process.jsp

  <%@ page import="beans.User" %>
  <%@ page import="java.io.FileInputStream" %>
  <%@ page import="java.io.ObjectInputStream" %><%--
  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <%
          String id = request.getParameter("id");
          String pw = request.getParameter("pw");

          String storedName = null;
          String storedId = null;
          String storedPw = null;
          String storedEmail = null;

          String realPath = application.getRealPath("/users/user_" + id);
          try {
                  FileInputStream fis = new FileInputStream(realPath);
                  if (fis != null) {
                          ObjectInputStream ois = new ObjectInputStream(fis);
                          User mUser = (User) ois.readObject();
                          storedName = mUser.getName();
                          storedId = mUser.getId();
                          storedPw = mUser.getPw();
                          storedEmail = mUser.getEmail();
                          System.out.println(storedId + storedPw + " " + id + pw);
                          ois.close();
                  }


                  if (id.equals(storedId) && pw.equals(storedPw)) {
                          System.out.println("IN");
                          out.print("<html><head><title>로그인 처리</title></head><body>" +
                                          "<h2>가입한 정보입니다.</h2><br>" +
                                          "<hr><br>" +
                                          "이름 : " + storedName + "<br>" +
                                          "ID : " + storedId + "<br>" +
                                          "Email : " + storedEmail + "<br></body></html>");
                  } else if (id.equals(storedId)) {
  %>
  <script>
          alert("비밀번호가 다릅니다.");
          history.back();
  </script>
  <%
  } else {
  %>
  <script>
          alert("일치하는 ID의 회원정보가 없습니다.");
          history.back();
  </script>
  <%
          } } catch (Exception e) {
          System.out.println(e.getMessage());
  %>
  <script>
          alert("일치하는 ID의 회원정보가 없습니다.");
          history.back();
  </script>
  <% } %>	