java - 添加错误并将请求发送回请求页面 servlet 过滤器

Question

我正在编写一个 servlet 过滤器。我想添加错误并将响应发送回请求来自的页面。

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) 
        throws IOException, ServletException {

        final HttpServletRequest servletRequest = (HttpServletRequest)request;
       final HttpServletResponse servletResponse = (HttpServletResponse) response;
       //add error and redirect the request to previous page
       chain.doFilter(request, response);

}

我知道我们可以将响应重定向为

servletResponse.sendRedirect("/WebContent/Error.jsp");

请让我知道如何添加错误消息并将请求发回。

我想添加一些自定义错误消息。"Validation failed. Please try again".

提前致谢

Answer 1

servlet 响应。发送错误（）？？