您不能，不使用标准API。HttpServletRequest代表服务器收到的请求，因此添加新参数不是有效的选择（就API而言）。

原则上，您可以实现一个子类，HttpServletRequestWrapper该子类包装原始请求，并拦截getParameter()方法，并在转发时传递包装的请求。

如果您走这条路线，则应使用Filter将替换HttpServletRequest为HttpServletRequestWrapper：

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    if (servletRequest instanceof HttpServletRequest) {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        // Check wether the current request needs to be able to support the body to be read multiple times
        if (MULTI_READ_HTTP_METHODS.contains(request.getMethod())) {
            // Override current HttpServletRequest with custom implementation
            filterChain.doFilter(new HttpServletRequestWrapper(request), servletResponse);
            return;
        }
    }
    filterChain.doFilter(servletRequest, servletResponse);
}