帮我敲一个springboot登录验证的代码

好的，下面是一个简单的Spring Boot登录验证代码示例：

首先，需要在pom.xml中添加Spring Boot Web和Spring Boot Security的依赖：

<dependencies>
    <!-- Spring Boot Web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <!-- Spring Boot Security -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
</dependencies>

然后，创建一个SecurityConfig类来配置Spring Security：

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers("/", "/login").permitAll()
                .anyRequest().authenticated()
                .and()
            .formLogin()
                .loginPage("/login")
                .defaultSuccessUrl("/home")
                .permitAll()
                .and()
            .logout()
                .logoutUrl("/logout")
                .permitAll();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

上面的代码配置了Spring Security的登录页面、注销、用户认证和权限控制等相关信息。

然后，创建一个UserDetailsServiceImpl类来实现UserDetailsService接口，用于获取用户的详细信息：

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private UserRepository userRepository;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUsername(username);
        if (user == null) {
            throw new UsernameNotFoundException("用户不存在");
        }
        List<GrantedAuthority> authorities = new ArrayList<>();
        authorities.add(new SimpleGrantedAuthority("ROLE_USER"));
        return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), authorities);
    }
}

最后，创建一个UserController类来处理登录相关的请求：

@RestController
public class UserController {

    @GetMapping("/")
    public String index() {
        return "欢迎访问首页！";
    }

    @GetMapping("/login")
    public String login() {
        return "请登录！";
    }

    @GetMapping("/home")
    public String home() {
        return "欢迎回来！";
    }
}

上面的代码处理了首页、登录和主页的请求。

以上就是一个简单的Spring Boot登录验证代码示例，希望能对你有所帮助！