微服务简单案例可以参照使用Spring Cloud Security OAuth2搭建授权服务。

spring-cloud--security /oauth/token 报错401。

错误信息如下：

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

在网上看了好多，都说是由于现在的spring security密码格式变化。

{id}encodedPassword

但是我使用了还是有问题。最后在Spring Security 5.0的DelegatingPasswordEncoder详解找到了始末，也自己跟踪了代码发现确实如此。

public class DelegatingPasswordEncoder implements PasswordEncoder {
    private PasswordEncoder defaultPasswordEncoderForMatches = new DelegatingPasswordEncoder.UnmappedIdPasswordEncoder();
    public boolean matches(CharSequence rawPassword, String prefixEncodedPassword) {
        if (rawPassword == null && prefixEncodedPassword == null) {
            return true;
        } else {
            String id = this.extractId(prefixEncodedPassword);        //1.这里我们没有指定PasswordEncoder 是null
            PasswordEncoder delegate = (PasswordEncoder)this.idToPasswordEncoder.get(id);
            if (delegate == null) {
                return this.defaultPasswordEncoderForMatches.matches(rawPassword, prefixEncodedPassword);        //2.进入这里
            } else {
                String encodedPassword = this.extractEncodedPassword(prefixEncodedPassword);
                return delegate.matches(rawPassword, encodedPassword);
            }
        }
    }
    //内部类
    private class UnmappedIdPasswordEncoder implements PasswordEncoder {
        private UnmappedIdPasswordEncoder() {
        }

        public String encode(CharSequence rawPassword) {
            throw new UnsupportedOperationException("encode is not supported");
        }
        //3.最终调用，也就是我们看到的异常信息
        public boolean matches(CharSequence rawPassword, String prefixEncodedPassword) {
            String id = DelegatingPasswordEncoder.this.extractId(prefixEncodedPassword);
            throw new IllegalArgumentException("There is no PasswordEncoder mapped for the id \"" + id + "\"");
        }
    }
}

升级之后`DelegatingPasswordEncoder`中要求提供自定义的PasswordEncoder。对于使用spring security的人肯定是够了。如下：

public class MyWebSecurityConfigurerAdapter extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication().passwordEncoder(new BCryptPasswordEncoder())    //1.第一处
                .withUser("user1").
                password(new BCryptPasswordEncoder().encode("123456"))        //2.第二处
                .roles("USER");
    }
}

但是如果你使用的spring-cloud-starter-oauth2，那还需要进行其他的配置。

@Configuration
public class MyAuthorizationServerConfigurerAdapter extends AuthorizationServerConfigurerAdapter {

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        clients.inMemory()
                .withClient("client")
                .secret(new BCryptPasswordEncoder().encode("secret"))    //1.第一处
                .authorizedGrantTypes("authorization_code")
                .scopes("app")
                .redirectUris("http://www.baidu.com");
    }

    @Override
        public void configure(AuthorizationServerSecurityConfigurer security) throws Exception {
            security.allowFormAuthenticationForClients()
                    .passwordEncoder(new BCryptPasswordEncoder());    //2.第二处
        }

}