修改自定义realm

//自定义realm
public class CustomerRealm extends AuthorizingRealm {
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        return null;
    }
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        //根据身份信息//从传过来的token获取到的用户名
        String principal = (String) token.getPrincipal();
        //在工厂中获取service对象
        UserService userService = (UserService) ApplicationContextUtils.getBean("userService");
        //根据身份信息查询
        User user = userService.findByUserName(principal);
        //用户不为空
        if(!ObjectUtils.isEmpty(user)){
            //返回数据库信息
            return new SimpleAuthenticationInfo(user.getUsername(), user.getPassword(),
                    ByteSource.Util.bytes(user.getSalt()), this.getName());;
        }
        return null;
    }