记dubbo中的Filter拦截器在invoke中的ThreadLocal关闭

@Override
    public Result invoke(Invoker invoker, Invocation invocation) throws RpcException {
        Result rs = null;
        try {
            ...
            UserContext.addContext(userVo);
            rs = invoker.invoke(invocation);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            UserContext.removeUserContext();
        }
        return rs;
    }

public class UserContext {

    private static ThreadLocal  userThreadLocal = new ThreadLocal<>();

    public static void addContext(UserVo userVo){
        userThreadLocal.set(userVo);
    }

    public static UserVo getUserContext(){
        return contextUser();
    }

    public static void removeUserContext(){
        userThreadLocal.remove();
    }

    private static UserVo contextUser(){
        if(userThreadLocal.get()==null){
            userThreadLocal.set(new UserVo());
        }
        return  userThreadLocal.get();
    }

}