ssm实现注册登录代码

以下是一个简单的基于SSM框架的注册登录示例代码：

1. 数据库表设计

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(50) NOT NULL,
  `password` varchar(50) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

2. 编写实体类

public class User {
    private int id;
    private String username;
    private String password;
    // getter/setter方法省略
}

3. 编写DAO层

public interface UserDao {
    void addUser(User user);
    User getUserByUsername(String username);
}

@Repository
public class UserDaoImpl implements UserDao {
    @Autowired
    private SqlSessionTemplate sqlSessionTemplate;

    @Override
    public void addUser(User user) {
        sqlSessionTemplate.insert("user.addUser", user);
    }

    @Override
    public User getUserByUsername(String username) {
        return sqlSessionTemplate.selectOne("user.getUserByUsername", username);
    }
}

4. 编写Service层

public interface UserService {
    void register(User user);
    User login(String username, String password);
}

@Service
@Transactional
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;

    @Override
    public void register(User user) {
        userDao.addUser(user);
    }

    @Override
    public User login(String username, String password) {
        User user = userDao.getUserByUsername(username);
        if (user != null && user.getPassword().equals(password)) {
            return user;
        }
        return null;
    }
}

5. 编写Controller层

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("/register")
    public String register(User user, Model model) {
        userService.register(user);
        model.addAttribute("message", "注册成功，请登录！");
        return "login";
    }

    @RequestMapping("/login")
    public String login(String username, String password, Model model) {
        User user = userService.login(username, password);
        if (user != null) {
            model.addAttribute("message", "登录成功！");
            return "success";
        } else {
            model.addAttribute("message", "用户名或密码错误，请重新输入！");
            return "login";
        }
    }
}

6. 编写前端页面

注册页面(register.jsp)：

<form action="${pageContext.request.contextPath}/user/register" method="post">
    <p>
        用户名：<input type="text" name="username" required>
    </p>
    <p>
        密码：<input type="password" name="password" required>
    </p>
    <p>
        <input type="submit" value="注册">
    </p>
</form>

登录页面(login.jsp)：

<form action="${pageContext.request.contextPath}/user/login" method="post">
    <p>
        用户名：<input type="text" name="username" required>
    </p>
    <p>
        密码：<input type="password" name="password" required>
    </p>
    <p>
        <input type="submit" value="登录">
    </p>
</form>

成功页面(success.jsp)：

<p>${message}</p>

以上代码仅供参考，具体实现还需要根据具体的项目需求进行调整。