JavaWeb使用mvc模式實現登入功能
阿新 • • 發佈:2022-01-30
目錄
- 部署專案、環境搭建
- 詳細內容
- 登入實現
部署專案、環境搭建
詳細內容
1.導包
2.web >> index.p web >> login.jsp web >>success.jsp
1) web >> index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="" %> <html> <head> <title>$Title$</title> </head> <body> <a href="login.jsp">登入</a> </body> </html>
2) web >> login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html lang="en"> <head> <meta charset="UTF-8"> <title>登入</title> <style> #msg { color: red; } </style> </head> <body> <form action="user" method="post"> 賬號:<input type="text" name="userName"><span id="msg"><%=request.getAttribute("msg")%></span> 密碼:<input type="text" name="passWord"> <input type="hidden" name="method" value="login"> <input type="submit" value="登入"> </form> </body> </html>
3) web >>success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ page import="constant.Con" %> <html> <head> <title>使用者中心</title> </head> <body> <%=request.getSession().getAttribute(Con.USER)%><h1 style="color: green">歡迎您</h1> <a href="login.html">返回重新登入</a> </body> </html>http://www.cppcns.com;
3.constant >> Con
package constant; import java.io.Serializable; public class Con implements Serializable { //session中儲存使用者登入資訊 public static final String USER = "user"; }
entity >> User
package entity; import java.io.Serializable; public class User implements Serializable { private int id; private String userName; private String passWord; public User(int id,String userName,String passWord) { this.id = id; this.userName = userName; this.passWord = passWord; } public User() { } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassWord() { return passWord; } public void setPassWord(String passWord) { this.passWord = passWord; } }
4.resources >> prop.properties
driverClassName=com..cj.jdbc.Driver urlName=jdbc:mysql://localhost:3306/myjdbc?characterEncoding=utf8&useSSL=false&serverTimezone=UTC userName=root passwordName=root
5.utils >> JDBCUtils
package utils; import java.io.IOException; import java.io.InputStream; import java.sql.*; import java.util.Properties; /* JDBC工具類 */ public class JDBCUtils { // 宣告驅動的路徑 static String driverClass; static String url; static String user; static String password; /* 靜態程式碼塊只會在載入class檔案的時候執行一次, 將註冊驅動的程式碼由靜態程式碼塊來實現 */ static { // 建立屬性集物件 Properties prop = new Properties(); // 將檔案中的資料讀取到屬性集中 try { //prop.properties InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("prop.properties"); prop.load(is); } catch (IOException e) { e.printStackTrace(); } // 獲取key對應的value driverClass = prop.getProperty("driverClassName"); url = prop.getProperty("urlName"); user = prop.getProperty("userName"); password = prop.getProperty("passwordName"); try { // 載入驅動 Class.forName(driverClass); } catch (ClassNotFoundException e) { e.printStackTrace(); } } /* 將獲取資源的方法進行封裝: Connection連線介面物件 */ public static Connection getConnection() throws SQLException,ClassNotFoundException { // 獲取連線 Connection connection = DriverManager.getConnection(url,user,password); return connection; } /* 封裝方法,用於釋放資源 */ public static void close(Connection connection,Statement statement,ResultSet resultSet) { try { if (resultSet != null) { resultSet.close(); } } catch (SQLException e) { e.printStackTrace(); } // 呼叫已經實現功能的方法直接使用 close(connection,statement); } /* 過載一個釋放資源的程式碼,用來釋放兩個資源 */ public static void close(Connection connection,Statement statement) { try { if (statement != null) { statement.close(); } } catch (SQLException e) { e.printStackTrace(); } try { if (connection != null) { connection.close(); } } catch (SQLException e) { e.printStackTrace(); } } }
6.servlet >> UserServlet
package servlet; import constant.Con; import service.UserService; import service.impl.UserServiceImpl; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet(name = "user",urlPatterns = "/user") public class UserServlet extends HttpServlet { private UserService userService = new UserServiceImpl(); @Override protected void service(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException { //1.設定請求字符集為utf-8 req.setCharacterEncoding("utf-8"); //2.獲取請求引數method,根據值呼叫不同方法處理業務 String method = req.getParameter("method"); if (method.equals("login")) { this.login(req,resp); } } //登入方法 private void login(HttpServletRequest req,IOException { //1.獲取賬號和密碼 String userName = req.getParameter("userName"); String passWord = req.getParameter("passWord"); //2.呼叫service的方法處理登入 boolean result = userService.checkUser(userName,passWord); if (result) { //true表示登入成功 //轉發跳轉成功頁面 //req.getRequestDispatcher("/success.jsp").forward(req,resp); //將使用者資訊儲存在session域物件中 req.getSession().setAttribute(Con.USER,userName); //重定向跳轉成功頁面 resp.sendRedirect(req.getContextPath() + "/success.jsp"); } else { //false登入失敗,返回登入頁面 req.setAttribute("msg","賬號密碼不匹配"); req.getRequestDispatcher("/login.jsp").forward(req,resp); } } }
7.service >> UserServiceservice >> impl >> UserServiceImpl
package service; public interface UserService { //判斷登入成功與否 boolean checkUser(String userName,String passWord); }
package service.impl; import dao.UserDao; import dao.impl.UserDaoImpl; import entity.User; import service.UserService; import utils.JDBCUtils; import java.sql.Connection; import java.util.List; public class UserServiceImpl implements UserService { private UserDao userDao = new UserDaoImpl(); @Override public boolean checkUser(String userName,String passWord) { // 連線物件 Connection connection = null; try { //1.獲取連線 connection = JDBCUtils.getConnection(); //2.呼叫dao方法查詢資料 List<User> users = userDao.findUserByUserNameAndPassWord(connection,userName,passWord); //3.根據查詢結果返回成功失敗標誌 if (users.size() > 0) { return true; } else { return false; } } catch (Exception e) { e.printStackTrace(); return false; } finally { JDBCUtils.close(connection,null); } } }
8.dao >> UserDao dao >> impl >> UserDaoImpl
package dao; import entity.User; import java.sql.Connection; import java.util.List; public interface UserDao { //根據賬號密碼查詢資料庫,返回結果集 List<User> findUserByUserNameAndPassWord(Connection connection,String passWord); }
package dao.impl; import dao.UserDao; import entity.User; import utils.JDBCUtils; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.List; public class UserDaoImpl implements UserDao { @Override public List<User> findUserByUserNameAndPassWord(Connection connection,String userNamVTMQwWDe,String passWord) { // 傳送sql語句物件 PreparedStatement statement = null; List&lVTMQwWDt;User> userList = new ArrayList<>(); try { connection = JDBCUtils.getConnection(); // 獲取Statement物件 statement = connection.prepareStatement("select * from user where username = ? and password = ?"); statement.setString(1,userName); statement.setString(2,passWord); ResultSet rs = statement.executeQuery(); while (rs.next()) { User user = new User(); int id = rs.getInt(1); String username = rs.getString(2); String password = rs.getString(3); user.setId(id); user.setUserName(username); user.setPassWord(password); userList.add(user); } return userList; } catch (Exception e) { e.printStackTrace(); return userList; } finally { JDBCUtils.close(null,statement,null); } } }
登入實現
1.首頁 index.jsp
2.錯誤登入login.jsp
3. 正確登入login.jsp
4. 登入成功success.jsp
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