如何在Spring Boot应用程序中实现自定义身份验证

// 自定义身份验证提供者
@Component
public class CustomAuthenticationProvider implements AuthenticationProvider {

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        String username = authentication.getName();
        String password = authentication.getCredentials().toString();

        // 自定义身份验证逻辑
        if (username.equals("admin") && password.equals("password")) {
            return new UsernamePasswordAuthenticationToken(username, password, new ArrayList<>());
        } else {
            throw new BadCredentialsException("Invalid username or password");
        }
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return authentication.equals(UsernamePasswordAuthenticationToken.class);
    }
}

// Spring Security配置类
@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private CustomAuthenticationProvider authenticationProvider;

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

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

// 自定义登录页面
@Controller
public class LoginController {

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

// 处理身份验证结果
@Controller
public class HomeController {

    @GetMapping("/home")
    public String home() {
        return "home";
    }
}