前后端分离项目springsecurity实现用户登录认证快速使用

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
 
// 假设这是一个从数据库加载的用户实体类
public class CustomUserDetails implements UserDetails {
    private String username;
    private String password;
    private Collection<? extends GrantedAuthority> authorities;
 
    // 构造函数，从数据库加载用户信息
    public CustomUserDetails(String username, String password, Collection<? extends GrantedAuthority> authorities) {
        this.username = username;
        this.password = password;
        this.authorities = authorities;
    }
 
    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return authorities; // 返回用户的权限集合
    }
 
    @Override
    public String getPassword() {
        return password; // 返回用户的密码
    }
 
    @Override
    public String getUsername() {
        return username; // 返回用户的用户名
    }
 
    @Override
    public boolean isAccountNonExpired() {
        return true; // 账户没有过期
    }
 
    @Override
    public boolean isAccountNonLocked() {
        return true; // 账户没有锁定
    }
 
    @Override
    public boolean isCredentialsNonExpired() {
        return true; // 凭证（密码）没有过期
    }
 
    @Override
    public boolean isEnabled() {
        return true; // 账户启用
    }
 
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        CustomUserDetails that = (CustomUserDetails) o;
        return Objects.equals(username, that.username);
    }
 
    @Override
    public int hashCode() {
        return Objects.hash(username);
    }
}
 
// SecurityConfig.java 的一部分
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    auth.userDetailsService(userDetailsService());
}
 
// SecurityConfig.java 的一部分
@Bean
public UserDetailsService userDetailsService() {
    return username -> {
        // 从数据库加载用户信息，这里假设已经有方法getUserDetailsFromDatabase(String username)
        UserDetails userDetails = getU