在學習SpringBoot整合SpringSecurity的時候，做簡單認證的時候出現這種錯誤。
是因為，在 進行認證的時候我自定義的認證UserDetailsService 的密碼沒有進行加密，所以
才會出現這種情況。新增以下方法即可：

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

整個WebSecurityConfig的【】配置如下：

package com.snowy.security.config;

import org.springframework
 
.context.annotation.Bean;
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.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

/**
 * Created by Snowy on 2018/6/30.
 */
@Configuration
public class LightWebSecurityConfig extends WebSecurityConfigurerAdapter{

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

    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http.formLogin().loginPage("/login").defaultSuccessUrl("/home")
                .and()
                .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated();
    }
}

我自定義的USerDetailsService是：

package com.snowy.security.security;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Component;

import java.net.PasswordAuthentication;

/**
 * Created by Snowy on 2018/6/30.
 */
@Component
public class LightUserDetailsService implements UserDetailsService{

    @Autowired
    private PasswordEncoder passwordEncoder;
    private Logger logger = LoggerFactory.getLogger(LightUserDetailsService.class);

    @Override
    public UserDetails loadUserByUsername(String s) throws UsernameNotFoundException {
        logger.info("使用者名稱是:"+s);
        return new User(s,passwordEncoder.encode("123456"),true,true,true,true,AuthorityUtils.commaSeparatedStringToAuthorityList("admin"));
    }
}

當然，如果你有自己的加密方法，那麼就在LightWebSecurityConfig 中
@Bean中
return 出來的加密方法，是你自己的就行。