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我爱Java系列---【登录案例】

發布時間：2025/4/14 java 18 豆豆

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一、登錄案例分析

二、實施流程

1.創建數據庫web01,用戶表user

代碼：

CREATE DATABASE web01;
USE web01;
CREATE TABLE USER(
uid INT PRIMARY KEY AUTO_INCREMENT,
userName VARCHAR(32),
PASSWORD VARCHAR(32)
);

2.在idea中創建User類

public class User {

int uid;
String userName;
String passWord;

public int getUid() {
return uid;
}

public String getUserName() {
return userName;
}

public String getPassWord() {
return passWord;
}

public void setUid(int uid) {
this.uid = uid;
}

public void setUserName(String userName) {
this.userName = userName;
}

public void setPassWord(String passWord) {
this.passWord = passWord;
}

@Override
public String toString() {
return "User{" +
"uid=" + uid +
", userName='" + userName + '\'' +
", passWord='" + passWord + '\'' +
'}';
}
}

3.創建UserDao類

public class UserDao {
@Test
/* public void run() throws SQLException {
User u = query("hujunwei", "123");
System.out.println(u);
}*/
public User queryByuserNameandPassword(String userName,String passWord) throws SQLException {
QueryRunner qr = new QueryRunner(C3P0Utils.getDS());
String sql = "select * from user where userName=? and passWord=?";
User query = qr.query(sql, new BeanHandler<User>(User.class), userName, passWord);
return query;
}
}

4.創建Service類

public class Service {
UserDao userDao = new UserDao();
public boolean login(String userName,String passWord) {

User user = null;
try {
user = userDao.queryByuserNameandPassword(userName, passWord);
return user!=null;
} catch (SQLException e) {
e.printStackTrace();
}
return false;
}
}

5.創建LoginServlet

@WebServlet(urlPatterns = "/login")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String userName = request.getParameter("userName");
String passWord = request.getParameter("passWord");
Service service = new Service();
boolean login = service.login(userName, passWord);
if (login){
response.getWriter().println("登錄成功！");
}else {
response.getWriter().println("登錄失敗！");
}
}
}

6.創建頁面login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>黑馬商城</title>
</head>
<body>
<form action="/web01/login" method="post">
<div>
用戶名：<input type="text" name="userName" value="" placeholder="請輸入用戶名"></br>
密　碼：<input type="password" name="passWord" value="" placeholder="請輸入密碼"></br>
<input type="submit" value="登錄" >
</div>
</form>
</body>
</html>

轉載于:https://www.cnblogs.com/hujunwei/p/10947369.html

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