Authentication(身份认证)

通过获取Spring 身份认证(Authentication)来获取用户信息,这种方式必须
①请求头中携带Authorization token
或
②请求参数中携带access_token =token 参数
才能有效获取用户信息

    String userId;
	//获取身份验证
	Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
	if (authentication instanceof OAuth2Authentication) {
		OAuth2Authentication oAuth2Authentication = (OAuth2Authentication)authentication;
		Object details = oAuth2Authentication.getUserAuthentication().getDetails();
		if (details == null) {
			log.error("获取用户信息失败！");
			throw new UserException("获取用户信息失败！");
		} else {
			try {
				//获取用户详细信息
				Map<String, ?> userInfo = (Map)details;
				userId= userInfo == null ? null : String.valueOf(userInfo.get("user_id"));
			} catch (Exception var5) {
				log.error(var5.getMessage());
				throw new ClassCastException("类型转换异常");
			}
		}
	} 

JwtHelper(token解密)

1）那我如果不使用常规传递模式，而使用自定义token参数名、或者其他渠道获取的token；
2）需要使用JwtHelper 进行解密；
示例代码中 使用的请求参数名就是 T，通过T 参数获取token 并且解密

	//获取请求request
	ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
	HttpServletRequest request = attributes.getRequest();

	//获取token管理服务
	BearerTokenExtractor bearerTokenExtractor = new BearerTokenExtractor();
	//通过token管理提取token
	Authentication extract = bearerTokenExtractor.extract(request);
    Object principal =  extract == null ? null : extract.getPrincipal() ;

	//获取token
	String token;
	if (Objects.isNull(extract)){
	token = request.getParameter("T"); //自定义参数token名称
	}else {
	token = String.valueOf(extract.getPrincipal());
	}
	//解析token
	Jwt jwt = JwtHelper.decode(token);
	String claimsStr = jwt.getClaims();
	Map<String, Object> claims = JsonParserFactory.create().parseMap(claimsStr);
	String userId = String.valueOf(claims.get("user_id"));