在Spring Security中如何自定义失败登录的处理逻辑

要自定义Spring Security失败登录的处理逻辑，可以通过实现AuthenticationFailureHandler接口来实现。具体步骤如下：

1. 创建一个类实现AuthenticationFailureHandler接口，并实现onAuthenticationFailure方法，该方法用于处理登录失败的逻辑，例如记录登录失败的次数、发送警告邮件等。

import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class CustomAuthenticationFailureHandler implements AuthenticationFailureHandler {

    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) throws IOException, ServletException {
        // 处理登录失败的逻辑
        System.out.println("登录失败");
    }
}

2. 在Spring Security配置类中配置自定义的AuthenticationFailureHandler。可以通过调用failureHandler方法来设置自定义的AuthenticationFailureHandler。

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private CustomAuthenticationFailureHandler customAuthenticationFailureHandler;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .formLogin()
                .loginPage("/login")
                .failureHandler(customAuthenticationFailureHandler);
    }
}

通过以上步骤，就可以实现自定义Spring Security失败登录的处理逻辑。在登录失败时，会调用CustomAuthenticationFailureHandler中的onAuthenticationFailure方法来处理登录失败的逻辑。