如何解决security中异常UsernameNotFoundException总是抛出密码错误问题

使用spring security进行授权登录的时候，发现登录接口无法正常捕捉UsernameNotFoundException异常，捕捉到的一直是BadCredentialsException异常。我们的预期是：

• UsernameNotFoundException -> 用户名错误
• BadCredentialsException -> 密码错误

贴几个比较重要的代码：

经过步进法跟踪代码，发现问题所在，位于

AbstractUserDetailsAuthenticationProvider
public Authentication authenticate(Authentication authentication)

结论

1、loadUserByUsername方法确实抛出了UsernameNotFoundException

2、走到AbstractUserDetailsAuthenticationProvider的authenticate方法的时候，如果hideUserNotFoundExceptions = true，直接就覆盖了UsernameNotFoundException异常并抛出BadCredentialsException异常，这也就解释了，为什么总是捕捉到BadCredentialsException异常

既然已经找到了是因为hideUserNotFoundExceptions = true导致的问题，那把hideUserNotFoundExceptions = false不就完事了吗？

方案1、修改WebSecurityConfig配置，添加AuthenticationProvider Bean

@Bean
public AuthenticationProvider daoAuthenticationProvider() {
    DaoAuthenticationProvider daoAuthenticationProvider = new DaoAuthenticationProvider();
    daoAuthenticationProvider.setUserDetailsService(userDetailsService);
    daoAuthenticationProvider.setPasswordEncoder(passwordEncoder());
    daoAuthenticationProvider.setHideUserNotFoundExceptions(false);
    return daoAuthenticationProvider;
}

然后配置

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

方案2、在自己的登录验证接口中不用抛出UsernameNotFoundException异常，直接抛出自定义异常，这个异常会被全局异常拦截

@Service
public class MyUserDetailService implements UserDetailsService {

    @Resource
    private SysUserService sysUserService;

    @Resource
    private SysRoleService sysRoleService;

    @Override
    public UserDetails loadUserByUsername(String userName){
       
        SysUser sysUser = sysUserService.getByUserName(userName);

        if (StringUtils.isNull(sysUser)) {
            throw new CustomException("用户不存在");
        } 
        // 查询账号角色
        List<String> roleList = sysRoleService.getListByUserId(sysUser.getUserId());

        return new UserVo(sysUser,new ArrayList<>());
    }
}

配置

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