用户认证

一共有三种方式来设置登录的用户名和密码

• 通过SpringBoot的配置文件
• 通过配置类
• 通过自定义编写实现类

通过SpringBoot配置文件

server.port=8111
spring.security.user.name=root
spring.security.user.password=123456

如上所示，用户名和密码分别为root和123456

通过配置类

在项目的config文件夹下编写配置类，并实现WebSecurityConfigurerAdapter

package com.sheep.securitylearning.config;
import lombok.RequiredArgsConstructor;
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.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
/**
* Created By Intellij IDEA
*
* @author ssssheep
* @package com.sheep.securitylearning.config
* @datetime 2022/8/8 星期一
*/
@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
        String password = encoder.encode("root");
        auth.inMemoryAuthentication()
                .withUser("root")
                .password(password)
                .roles("admin");
    }
    @Bean
    PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

通过上述配置的配置，就将用户名和密码分别为：root和root的用户配置到了内存当中

自定义编写实现类

同样也是通过配置类的方式来实现，但是配置类中重写的方法不同

package com.sheep.securitylearning.config;
import lombok.RequiredArgsConstructor;
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.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
/**
 * Created By Intellij IDEA
 *
 * @author ssssheep
 * @package com.sheep.securitylearning.config
 * @datetime 2022/8/8 星期一
 */
@Configuration
@RequiredArgsConstructor
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    final UserDetailsService userDetailsService;
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
    }
    @Bean
    PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

然后自定义一个userDetailsService的Bean
并且需要实现UserDetailsService这个接口
重写其中的方法，来返回UserDetails
但是UserDetails实际上是一个接口，因此我们需要返回的其实是它的实现类User

@Service("userDetailsService")
public class MyUserDetailServiceImpl implements UserDetailsService {
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        List<GrantedAuthority> auths = AuthorityUtils.commaSeparatedStringToAuthorityList("role");
        return new User("mary", new BCryptPasswordEncoder().encode("123"), auths);
    }
}