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

 今天刚学习springboot+spring security，结果访问请求登录时控制台报错：

java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id "null"
	at org.springframework.security.crypto.password.DelegatingPasswordEncoder$UnmappedIdPasswordEncoder.matches(DelegatingPasswordEncoder.java:244) ~[spring-security-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
	at org.springframework.security.crypto.password.DelegatingPasswordEncoder.matches(DelegatingPasswordEncoder.java:198) ~[spring-security-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter$LazyPasswordEncoder.matches(WebSecurityConfigurerAdapter.java:594) ~[spring-security-config-5.1.4.RELEASE.jar:5.1.4.RELEASE]
	at org.springframework.security.authentication.dao.DaoAuthenticationProvider.additionalAuthenticationChecks(DaoAuthenticationProvider.java:90) ~[spring-security-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
	at org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:166) ~[spring-security-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
	at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:175) ~[spring-security-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
	at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:200) ~[spring-security-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]

环境：jdk1.8,springboot2.1.3.RELEASE,spring security 5.1.4.RELEASE

package com.lucifer.morningstar.SpringSecurity;

import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

/**
 * @Auther: lucifer
 * @Date: 2019/4/2
 * @Description:
 */
@Configuration
@EnableWebSecurity
public class SpringSecurityConfig  extends WebSecurityConfigurerAdapter {


    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        //auth.inMemoryAuthentication().withUser("admin").password("123456").roles("ADMIN");
        auth.inMemoryAuthentication().passwordEncoder(new BCryptPasswordEncoder()).withUser("admin").password(new BCryptPasswordEncoder().encode("123456")).roles("ADMIN");
        
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/js/**","/css/**","/images/**");
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/")
                .permitAll()
                .anyRequest()
                .authenticated()
                .and()
                .logout()
                .permitAll()
                .and()
                .formLogin();
        http.csrf().disable();
    }
}

出问题的代码在这里：

auth.inMemoryAuthentication().withUser("admin").password("123456").roles("ADMIN");

官方文档：（spring-security5.2.0）

    内容（谷歌翻译的）：

简单的来说：

      从spring security 5.X开始，需要使用密码编码器，也就是需要对你的明文密码进行加密，而不NoAppasswordEncoder（无密码编码器）；

办法一：

1.1 使用BCryptPasswordEncoder（）

auth.inMemoryAuthentication().passwordEncoder(new BCryptPasswordEncoder()).withUser("admin").password(new BCryptPasswordEncoder().encode("123456")).roles("ADMIN");

1.2 使用Pbkdf2PasswordEncoder（）

 @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication().passwordEncoder(new Pbkdf2PasswordEncoder()).withUser("admin").password(new Pbkdf2PasswordEncoder().encode("123456")).roles("ADMIN");
    }

 1.3 SCryptPasswordEncoder（）这里就不展示了，同上；

 

方法二：自定义PasswordEncoders，需要实现PasswordEncoder 接口

package com.lucifer.morningstar.SpringSecurity;

import org.springframework.security.crypto.password.PasswordEncoder;

/**
 * @Auther: lucifer
 * @Date: 2019/4/2
 * @Description:
 */
public class MyPasswordEncoder implements PasswordEncoder {

    @Override
    public String encode(CharSequence charSequence) {
        return charSequence.toString();
    }

    @Override
    public boolean matches(CharSequence charSequence, String s) {
        return s.equals(charSequence.toString());
    }
}

 @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        //auth.inMemoryAuthentication().withUser("admin").password("123456").roles("ADMIN");
       //auth.inMemoryAuthentication().passwordEncoder(new BCryptPasswordEncoder()).withUser("admin").password(new BCryptPasswordEncoder().encode("123456")).roles("ADMIN");
        auth.inMemoryAuthentication().passwordEncoder(new MyPasswordEncoder()).withUser("admin").password("123456").roles("ADMIN");
    }