3.3.1 用户类

通常情况下，用户类SpringSecurity已经规定好了格式，需要将原本的用户数据类转化成UserDetails形式的用户数据类，才能在SpringSecurity中使用。
其中UserDetails接口如下：

public interface UserDetails extends Serializable {
    Collection<? extends GrantedAuthority> getAuthorities();
    String getPassword();
    String getUsername();
    boolean isAccountNonExpired();
    boolean isAccountNonLocked();
    boolean isCredentialsNonExpired();
    boolean isEnabled();
}

使用方式如下：

public class UserDetail implements UserDetails {
    private User user;
    public UserDetail(User user) {
        this.user = user;
    }
    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return null;
    }
    @Override
    public String getPassword() {
        return user.getPassword();
    }
    @Override
    public String getUsername() {
        return user.getUsername();
    }
    @Override
    public boolean isAccountNonExpired() {
        return true;
    }
    @Override
    public boolean isAccountNonLocked() {
        return true;
    }
    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }
    @Override
    public boolean isEnabled() {
        return user.isEnable();
    }
}