如何在 Spring Security 中自定义登录表单以使用自定义数据库

@override
public userdetails loaduserbyusername(string username) throws usernamenotfoundexception {
    string query = "select * from users where username = ?";
    user user = jdbctemplate.queryforobject(query, new object[]{username}, new userrowmapper());
    if (user == null) {
        throw new usernamenotfoundexception("user not found");
    }
    return user;
}

@Autowired
private PasswordEncoder passwordEncoder;

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

@Override
protected void configure(HttpSecurity http) throws Exception {
    http
        .authorizeRequests()
            .antMatchers("/login").permitAll()
            .anyRequest().authenticated()
        .and()
        .formLogin()
            .loginPage("/login")
            .loginProcessingUrl("/login")
            .defaultSuccessUrl("/welcome")
            .failureUrl("/login?error")
            .permitAll();
}