用java实现基于MVC模式重做用户注册、登录
时间: 2023-06-19 22:10:31 浏览: 60
好的,下面是一个简单的基于MVC模式的用户注册、登录代码示例,使用Java语言实现。
Model(模型):
```java
public class User {
private String username;
private String password;
public User(String username, String password) {
this.username = username;
this.password = password;
}
// getter and setter methods
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;
}
}
```
View(视图):
```java
import java.util.Scanner;
public class UserView {
private Scanner scanner;
public UserView() {
scanner = new Scanner(System.in);
}
public String getUsername() {
System.out.print("请输入用户名:");
return scanner.nextLine();
}
public String getPassword() {
System.out.print("请输入密码:");
return scanner.nextLine();
}
public void showLoginSuccessMessage() {
System.out.println("登录成功!");
}
public void showLoginFailureMessage() {
System.out.println("登录失败,用户名或密码错误!");
}
public void showRegisterSuccessMessage() {
System.out.println("注册成功!");
}
public void showRegisterFailureMessage() {
System.out.println("注册失败,用户名已存在!");
}
}
```
Controller(控制器):
```java
import java.util.ArrayList;
import java.util.List;
public class UserController {
private List<User> userList;
private UserView userView;
public UserController() {
userList = new ArrayList<>();
userView = new UserView();
}
public void login() {
String username = userView.getUsername();
String password = userView.getPassword();
for (User user : userList) {
if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
userView.showLoginSuccessMessage();
return;
}
}
userView.showLoginFailureMessage();
}
public void register() {
String username = userView.getUsername();
String password = userView.getPassword();
for (User user : userList) {
if (user.getUsername().equals(username)) {
userView.showRegisterFailureMessage();
return;
}
}
userList.add(new User(username, password));
userView.showRegisterSuccessMessage();
}
}
```
Main(主程序):
```java
public class Main {
public static void main(String[] args) {
UserController userController = new UserController();
while (true) {
System.out.println("请选择操作:1.登录 2.注册");
String choice = new Scanner(System.in).nextLine();
switch (choice) {
case "1":
userController.login();
break;
case "2":
userController.register();
break;
default:
System.out.println("无效选择,请重新选择!");
break;
}
}
}
}
```
上述代码示例中,模型(Model)是一个简单的用户类,包含用户名和密码;视图(View)是一个控制台交互界面,用于获取用户输入和显示消息;控制器(Controller)是一个用户控制器类,用于处理用户输入和更新模型,它包含两个方法:登录和注册。Main类是程序的入口点,它通过用户输入选择相应的操作,然后调用控制器的相应方法。整个过程符合MVC模式的分层结构,每一层职责清晰,代码易于维护。