在重定向过滤器时停止进一步处理 [英] Stop further processing when redirecting in a filter

问题描述

我有URLRewirteFilter，它检查请求的域是否以www开头。并重定向到no-www url。当要重定向请求时，如何停止进一步处理（调用JSF应用程序，调用servlet等）？
到目前为止我有这个：

I have URLRewirteFilter which checks if requested domain starts with www. and redirects to no-www url. How can I stop futher processing (invoking JSF app, call servlets etc.) when request is to be redirected? So far I have this:

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    HttpServletRequest req = (HttpServletRequest) request;
    String sn = req.getServerName().toLowerCase();
    if (sn.startsWith("www.")) {
        String url = "http://" + getDefaultDomain() + req.getContextPath() + req.getRequestURI();
        HttpServletResponse resp = (HttpServletResponse) response;
        resp.reset();
        resp.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
        resp.setHeader("Location", url);
    }
    chain.doFilter(request, response);
}

推荐答案

只需添加返回语句到结尾如果

if (sn.startsWith("www.")) {
    String url = "http://" + getDefaultDomain() + req.getContextPath() + req.getRequestURI();
    HttpServletResponse resp = (HttpServletResponse) response;
    resp.reset();
    resp.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
    resp.setHeader("Location", url);
    return;
}
chain.doFilter(request, response);

或添加 else

if (sn.startsWith("www.")) {
    String url = "http://" + getDefaultDomain() + req.getContextPath() + req.getRequestURI();
    HttpServletResponse resp = (HttpServletResponse) response;
    resp.reset();
    resp.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
    resp.setHeader("Location", url);
} else {
    chain.doFilter(request, response);
}

另请参阅：

• java.lang.IllegalStateException：提交响应后无法（转发| sendRedirect |创建会话）



See also:

• java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed

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