代码中password encoder bean如下：

@Bean
public BCryptPasswordEncoder passwordEncoder() {
    return new BCryptPasswordEncoder();
}

出现以下错误：

Encoded password does not look like BCrypt
所以按照Spring Security 5文档更新encoder如下：
@Bean
public PasswordEncoder passwordEncoder() {
    return PasswordEncoderFactories.createDelegatingPasswordEncoder();
}

可以在数据库中看到密码，存储的格式如下：

{bcrypt}$2a$10$LoV/3z36G86x6Gn101aekuz3q9d7yfBp3jFn7dzNN/AL5630FyUQ

上面错误解决，当进行身份验证时，出现如下错误：

java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id “null“

MyWebSecurity类代码

@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Bean
    public PasswordEncoder passwordEncoder() {
        return PasswordEncoderFactories.createDelegatingPasswordEncoder();
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
    }

    @Override
    public void configure(WebSecurity web) throws Exception {

        web
                .ignoring()
                .antMatchers(HttpMethod.OPTIONS)
                .antMatchers("/api/user/add");
    }

    @Override
    @Bean
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

MyOauth2配置

@Configuration
@EnableAuthorizationServer
protected static class AuthorizationServerConfiguration extends AuthorizationServerConfigurerAdapter {
    @Bean
    public TokenStore tokenStore() {
        return new InMemoryTokenStore();
    }
    @Autowired
    @Qualifier("authenticationManagerBean")
    private AuthenticationManager authenticationManager;

    @Bean
    public TokenEnhancer tokenEnhancer() {
        return new CustomTokenEnhancer();
    }
    @Bean
    public DefaultAccessTokenConverter accessTokenConverter() {
        return new DefaultAccessTokenConverter();
    }
    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints)
            throws Exception {
        endpoints
                .tokenStore(tokenStore())
                .tokenEnhancer(tokenEnhancer())
                .accessTokenConverter(accessTokenConverter())
                .authenticationManager(authenticationManager);
    }
    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients
                .inMemory()
                .withClient("test")
                .scopes("read", "write")
                .authorities(Roles.ADMIN.name(), Roles.USER.name())
                .authorizedGrantTypes("password", "refresh_token")
                .secret("secret") //问题原因：格式原因改成.secret("{noop}secret")
                .accessTokenValiditySeconds(1800);
    }
}

问题原因：

在配置ClientDetailsServiceConfigurer时，您还必须将新密码存储格式应用于客户端密钥。

 public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients
                .inMemory()
                .withClient("test")
                .scopes("read", "write")
                .authorities(Roles.ADMIN.name(), Roles.USER.name())
                .authorizedGrantTypes("password", "refresh_token")
                .secret("{noop}secret")//新的存储格式
                .accessTokenValiditySeconds(1800);
    }