From f507def213a95e59b988241fa3b400d2e22eca24 Mon Sep 17 00:00:00 2001
From: liyansheng <1761724207@qq.com>
Date: Fri, 20 Dec 2024 23:41:14 +0800
Subject: [PATCH] =?UTF-8?q?fix<=E7=99=BB=E5=BD=95=E6=B5=81=E7=A8=8B>?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/example/controller/LoginServlet.java | 42 +++++++++++++++++++
 src/main/java/example/dao/UserDao.java        |  6 +++
 .../java/example/service/IUserService.java    |  5 +++
 .../example/service/impl/UserServiceImpl.java | 15 +++++++
 src/main/webapp/login.jsp                     | 21 ++++++++++
 src/main/webapp/msg.jsp                       | 16 +++++++
 6 files changed, 105 insertions(+)
 create mode 100644 src/main/java/example/controller/LoginServlet.java
 create mode 100644 src/main/java/example/service/IUserService.java
 create mode 100644 src/main/java/example/service/impl/UserServiceImpl.java
 create mode 100644 src/main/webapp/login.jsp
 create mode 100644 src/main/webapp/msg.jsp

diff --git a/src/main/java/example/controller/LoginServlet.java b/src/main/java/example/controller/LoginServlet.java
new file mode 100644
index 0000000..4062ecc
--- /dev/null
+++ b/src/main/java/example/controller/LoginServlet.java
@@ -0,0 +1,42 @@
+package example.controller;
+
+import example.service.IUserService;
+import example.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("/login")
+public class LoginServlet extends HttpServlet {
+
+    IUserService userService = new UserServiceImpl();
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("text/html;charset=utf-8");
+        req.setCharacterEncoding("utf-8");
+        String username = req.getParameter("username");
+        String password = req.getParameter("password");
+        try {
+            boolean login = userService.login(username, password);
+            if(login){
+                req.getSession().setAttribute("username",username);
+                resp.sendRedirect("/index.jsp");
+            }else{
+                req.getSession().setAttribute("msg","用户名或密码错误");
+                resp.sendRedirect("/msg.jsp");
+            }
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.sendRedirect("/login.jsp");
+    }
+}
diff --git a/src/main/java/example/dao/UserDao.java b/src/main/java/example/dao/UserDao.java
index 11c7cfc..eeabbad 100644
--- a/src/main/java/example/dao/UserDao.java
+++ b/src/main/java/example/dao/UserDao.java
@@ -21,6 +21,11 @@ public class UserDao {
         return queryRunner.query(sql, new BeanHandler<>(User.class), id);
     }
 
+    public User getUserByUsername(String username) throws Exception {
+        String sql = "SELECT * FROM user WHERE username = ?";
+        return queryRunner.query(sql, new BeanHandler<>(User.class), username);
+    }
+
     public List<User> getAllUser() throws Exception {
         String sql = "SELECT * FROM user";
         return queryRunner.query(sql, new BeanListHandler<>(User.class));
@@ -40,4 +45,5 @@ public class UserDao {
         UserDao userDao = new UserDao();
         System.out.println(userDao.getUserById(1).getUsername());
     }
+
 }
diff --git a/src/main/java/example/service/IUserService.java b/src/main/java/example/service/IUserService.java
new file mode 100644
index 0000000..f3f0ba9
--- /dev/null
+++ b/src/main/java/example/service/IUserService.java
@@ -0,0 +1,5 @@
+package example.service;
+
+public interface IUserService {
+    boolean login(String username, String password) throws Exception;
+}
diff --git a/src/main/java/example/service/impl/UserServiceImpl.java b/src/main/java/example/service/impl/UserServiceImpl.java
new file mode 100644
index 0000000..3fa872c
--- /dev/null
+++ b/src/main/java/example/service/impl/UserServiceImpl.java
@@ -0,0 +1,15 @@
+package example.service.impl;
+
+import example.dao.UserDao;
+import example.model.User;
+import example.service.IUserService;
+
+public class UserServiceImpl implements IUserService {
+    UserDao userDao=new UserDao();
+
+    @Override
+    public boolean login(String username, String password) throws Exception {
+        User user = userDao.getUserByUsername(username);
+        return user != null && user.getPassword().equals(password);
+    }
+}
diff --git a/src/main/webapp/login.jsp b/src/main/webapp/login.jsp
new file mode 100644
index 0000000..d8b5511
--- /dev/null
+++ b/src/main/webapp/login.jsp
@@ -0,0 +1,21 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+    <!DOCTYPE html>
+    <html>
+
+    <head>
+        <script src="https://www.liyansheng.top/cdn/watermark.js"></script>
+    </head>
+
+    <body>
+        <h2>-电脑商城-用户登录</h2>
+        <form action="login" method="post">
+            <label for="username">用户名:</label>
+            <input type="text" id="username" name="username" required><br><br>
+            <label for="password">密码:</label>
+            <input type="password" id="password" name="password" required><br><br>
+            <button type="submit">登录</button>
+        </form>
+        <br>
+    </body>
+
+    </html>
\ No newline at end of file
diff --git a/src/main/webapp/msg.jsp b/src/main/webapp/msg.jsp
new file mode 100644
index 0000000..ec75a9a
--- /dev/null
+++ b/src/main/webapp/msg.jsp
@@ -0,0 +1,16 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+    <!DOCTYPE html>
+    <html>
+
+    <head>
+        <script src="https://www.liyansheng.top/cdn/watermark.js"></script>
+    </head>
+
+    <body>
+        <h2>提示:</h2>
+        <h3>${sessionScope.msg}</h3>
+        <button onclick="window.history.back();">返回</button>
+
+    </body>
+
+    </html>
\ No newline at end of file