springboot实现网页端登录和增删改查代码

以下是一个简单的Spring Boot实现网页端登录和增删改查的示例代码： 1. 首先，我们需要创建一个用户实体类 `User.java`： ```java @Entity @Table(name = "users") public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(nullable = false, unique = true) private String email; @Column(nullable = false) private String password; @Column(nullable = false) private String fullName; // getters and setters } ``` 2. 创建一个用户仓库类 `UserRepository.java`： ```java @Repository public interface UserRepository extends JpaRepository<User, Long> { User findByEmail(String email); } ``` 3. 创建一个服务类 `UserService.java`： ```java @Service public class UserService { @Autowired private UserRepository userRepository; public User findByEmail(String email) { return userRepository.findByEmail(email); } public void save(User user) { userRepository.save(user); } public void delete(User user) { userRepository.delete(user); } public List<User> findAll() { return userRepository.findAll(); } } ``` 4. 创建一个控制器类 `UserController.java`： ```java @Controller public class UserController { @Autowired private UserService userService; @GetMapping("/") public String index(Model model) { model.addAttribute("users", userService.findAll()); return "index"; } @GetMapping("/login") public String loginForm() { return "login"; } @PostMapping("/login") public String login(@RequestParam String email, @RequestParam String password, HttpSession session) { User user = userService.findByEmail(email); if (user != null && user.getPassword().equals(password)) { session.setAttribute("user", user); return "redirect:/"; } else { return "redirect:/login"; } } @GetMapping("/logout") public String logout(HttpSession session) { session.removeAttribute("user"); return "redirect:/"; } @GetMapping("/register") public String registerForm(Model model) { model.addAttribute("user", new User()); return "register"; } @PostMapping("/register") public String register(@Valid User user, BindingResult bindingResult) { if (bindingResult.hasErrors()) { return "register"; } else { userService.save(user); return "redirect:/login"; } } @GetMapping("/edit/{id}") public String editForm(@PathVariable Long id, Model model) { User user = userService.findById(id); if (user != null) { model.addAttribute("user", user); return "edit"; } else { return "redirect:/"; } } @PostMapping("/edit") public String edit(@Valid User user, BindingResult bindingResult) { if (bindingResult.hasErrors()) { return "edit"; } else { userService.save(user); return "redirect:/"; } } @GetMapping("/delete/{id}") public String delete(@PathVariable Long id) { User user = userService.findById(id); if (user != null) { userService.delete(user); } return "redirect:/"; } } ``` 5. 创建网页模板文件 `index.html`，`login.html`，`register.html`，`edit.html`： `index.html` ```html <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>User Management</title> </head> <body> <h1>User Management</h1> <p><a href="/logout">Logout</a></p> <table> <thead> <tr> <th>ID</th> <th>Email</th> <th>Full Name</th> <th>Actions</th> </tr> </thead> <tbody> <tr th:each="user : ${users}"> <td th:text="${user.id}"></td> <td th:text="${user.email}"></td> <td th:text="${user.fullName}"></td> <td> <a th:href="@{/edit/{id}(id=${user.id})}">Edit</a> <a th:href="@{/delete/{id}(id=${user.id})}">Delete</a> </td> </tr> </tbody> </table> <p><a href="/register">Register</a></p> </body> </html> ``` `login.html` ```html <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Login</title> </head> <body> <h1>Login</h1> <form method="post" action="/login"> <label>Email:</label><br> <input type="email" name="email"><br> <label>Password:</label><br> <input type="password" name="password"><br> <input type="submit" value="Login"> </form> <p><a href="/register">Register</a></p> </body> </html> ``` `register.html` ```html <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Register</title> </head> <body> <h1>Register</h1> <form method="post" action="/register"> <label>Email:</label><br> <input type="email" name="email" th:field="*{email}"><br> <label>Password:</label><br> <input type="password" name="password" th:field="*{password}"><br> <label>Full Name:</label><br> <input type="text" name="fullName" th:field="*{fullName}"><br> <input type="submit" value="Register"> </form> <p><a href="/login">Login</a></p> </body> </html> ``` `edit.html` ```html <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Edit User</title> </head> <body> <h1>Edit User</h1> <form method="post" action="/edit"> <input type="hidden" name="id" th:field="*{id}"> <label>Email:</label><br> <input type="email" name="email" th:field="*{email}"><br> <label>Password:</label><br> <input type="password" name="password" th:field="*{password}"><br> <label>Full Name:</label><br> <input type="text" name="fullName" th:field="*{fullName}"><br> <input type="submit" value="Save"> </form> <p><a href="/">Back to List</a></p> </body> </html> ``` 6. 最后，在 `application.properties` 文件中设置数据库连接和端口： ``` spring.datasource.url=jdbc:mysql://localhost:3306/user_management?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=UTC spring.datasource.username=root spring.datasource.password=root server.port=8080 ``` 这样我们就完成了一个简单的Spring Boot实现网页端登录和增删改查的示例代码。

springboot实现网页端登录和增删改查代码

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