Spring Security 中的 AuthenticationManager配置及使用

@Configuration
@EnableWebSecurity
public class SecurityConfig {
    @Autowired
    private UserDetailsService userDetailsService;
    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(authorize -> authorize
                .anyRequest().authenticated()
            )
            .formLogin(Customizer.withDefaults());
        return http.build();
    }
    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration authenticationConfiguration) throws Exception {
        return authenticationConfiguration.getAuthenticationManager();
    }
    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
    }
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

@Service
public class CustomAuthenticationProvider implements AuthenticationProvider {
    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        String username = authentication.getName();
        String password = authentication.getCredentials().toString();
        // 自定义认证逻辑
        if ("user".equals(username) && "password".equals(password)) {
            return new UsernamePasswordAuthenticationToken(username, password, Collections.emptyList());
        } else {
            throw new BadCredentialsException("认证失败");
        }
    }
    @Override
    public boolean supports(Class<?> authentication) {
        return authentication.equals(UsernamePasswordAuthenticationToken.class);
    }
}
@Configuration
public class AppConfig {
    @Autowired
    private CustomAuthenticationProvider customAuthenticationProvider;
    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(customAuthenticationProvider);
    }
}

@Autowired
private AuthenticationManager authenticationManager;
public void authenticateUser(String username, String password) {
    try {
        Authentication authentication = authenticationManager.authenticate(
            new UsernamePasswordAuthenticationToken(username, password)
        );
        SecurityContextHolder.getContext().setAuthentication(authentication);
    } catch (AuthenticationException e) {
        // 处理认证失败的情况
        throw new RuntimeException("认证失败", e);
    }
}