解决springboot整合security报There is no PasswordEncoder mapped for the id "null"_springboot spring security账号密码不存在报null-优快云博客

本文解决SpringBoot(2.1.6.RELEASE)整合Security(2.1.6)时出现的密码编码器未映射错误，并介绍如何在SpringSecurity5中正确设置密码格式。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1、使用springboot(版本2.1.6.RELEASE)整合security(版本2.1.6),出现下面错误的解决方案：

java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id "null"
	at org.springframework.security.crypto.password.DelegatingPasswordEncoder$UnmappedIdPasswordEncoder.matches(DelegatingPasswordEncoder.java:244) ~[spring-security-core-5.1.5.RELEASE.jar:5.1.5.RELEASE]
	at org.springframework.security.crypto.password.DelegatingPasswordEncoder.matches(DelegatingPasswordEncoder.java:198) ~[spring-security-core-5.1.5.RELEASE.jar:5.1.5.RELEASE]
	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter$LazyPasswordEncoder.matches(WebSecurityConfigurerAdapter.java:594) ~[spring-security-config-5.1.5.RELEASE.jar:5.1.5.RELEASE]

2、在Spring Security 5.0之前，默认值PasswordEncoder是NoOpPasswordEncoder需要纯文本密码。在Spring Security 5中，默认值为DelegatingPasswordEncoder，这需要密码存储格式。
在password中加入密码存储格式即可，如果是纯文本，添加{noop}即可

//定义认证规则
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        //super.configure(auth);
        auth.inMemoryAuthentication()
                .withUser("zhangsan").password("{noop}123456").roles("VIP1","VIP2")
                .and()
                .withUser("lisi").password("{noop}123456").roles("VIP2","VIP3")
                .and()
                .withUser("wangwu").password("{noop}123456").roles("VIP1","VIP3");

    }

新手勿喷，如有失误还请指教