基于授权码模式去修改:
https://www.yuque.com/docs/share/27959146-cdc4-43ec-a96a-c0969e1ac2d7?# 《授权码模式入门Demo》

代码地址

https://gitee.com/zjj19941/ZJJ_Neaten5.10/tree/master/ZJJ_SpringCloud_Oauth2/demo02

代码

修改WebSecurityConfig，增加AuthenticationManager

@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.formLogin().permitAll()
                .and().authorizeRequests()
                .antMatchers("/oauth/**").permitAll()
                .anyRequest().authenticated()
                .and().logout().permitAll()
                .and().csrf().disable();
    }
    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

修改AuthorizationServerConfig配置

@Configuration
@EnableAuthorizationServer
public class AuthorizationServerConfig2 extends AuthorizationServerConfigurerAdapter {
    @Autowired
    private PasswordEncoder passwordEncoder;
    @Autowired
    private AuthenticationManager authenticationManagerBean;
    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints.authenticationManager(authenticationManagerBean) //使用密码模式需要配置
                .allowedTokenEndpointRequestMethods(HttpMethod.GET,HttpMethod.POST); //支持GET,POST请求
    }
    @Override
    public void configure(AuthorizationServerSecurityConfigurer security) throws Exception {
        //允许表单认证
        security.allowFormAuthenticationForClients();
    }
    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        /**
         *授权码模式
         *http://localhost:8080/oauth/authorize?response_type=code&client_id=client&redirect_uri=http://www.baidu.com&scope=all
         *http://localhost:8080/oauth/authorize?response_type=code&client_id=client
         *
         * password模式
         *  http://localhost:8080/oauth/token?username=fox&password=123456&grant_type=password&client_id=client&client_secret=123123&scope=all
         *
         *  客户端模式
         *  http://localhost:8080/oauth/token?grant_type=client_credentials&scope=all&client_id=client&client_secret=123123
         */
        clients.inMemory()
                //配置client_id
                .withClient("client")
                //配置client-secret
                .secret(passwordEncoder.encode("123123"))
                //配置访问token的有效期
                .accessTokenValiditySeconds(3600)
                //配置刷新token的有效期
                .refreshTokenValiditySeconds(864000)
                //配置redirect_uri，用于授权成功后跳转
                .redirectUris("http://www.baidu.com")
                //配置申请的权限范围
                .scopes("all")
                /**
                 * 配置grant_type，表示授权类型
                 * authorization_code: 授权码
                 * password： 密码
                 * client_credentials: 客户端
                 */
                .authorizedGrantTypes("authorization_code","password","client_credentials");
    }
}