我的response.sendRedirect不起作用 [英] My response.sendRedirect isn't working

问题描述

我有一个SmartGWT应用程序，并在其中一个过滤器，我试图找出（登录）如果请求应该被转发（例如桌面到手机）。代码执行并且浏览器发出获取请求，但是没有得到响应，也没有做重定向。我已经尝试过使用 http://google.com ，但这并不起作用，所以它一定是别的。 / p>

  public void doFilter（ServletRequest req，ServletResponse res，
 FilterChain链）throws ServletException，IOException {
 
 HttpServletRequest请求=（HttpServletRequest）req; 
 HttpServletResponse响应=（HttpServletResponse）res; 
 HttpSession session = request.getSession（）; 
 
 WURFLHolder wurfl =（WURFLHolder）getFilterConfig（）。getServletContext（）。getAttribute（WURFLHolder.class.getName（））; 
 
 WURFLManager manager = wurfl.getWURFLManager（）; 
 
 Device device = manager.getDeviceForRequest（request）; 
 
布尔webBrowser = isWebBrowser（设备）; 
 
 String path =（（HttpServletRequest）请求）.getRequestURI（）; 
 
 boolean isBrowserOnMobile = true; // webBrowser&& path.contains（MOBILE_REQ_PATH）; 
 
 boolean isMobileOnDesktop =！webBrowser&& path.contains（DESKTOP_REQ_PATH）; 
 
 if（isBrowserOnMobile || isMobileOnDesktop）{
 if（isBrowserOnMobile）{
 path =http://www.google.com; 
} else {
 path =/PregledPredmeta/MobileAppEntryPoint.html; 
} 
 response.encodeRedirectURL（path）; 
 response.sendRedirect（path）; 
 return; 
  

......

解决方案

在使用 response.sendRedirect（）之前，您是否向HTTP响应发送了任何内容？要使用HTTP重定向HEADER，您不能向浏览器发送任何响应。即使是空格或分行/新行可以停止重定向。

如果您已经检查了所有的代码，并确保您没有发送任何内容浏览器，您可以使用JavaScript重定向< script> location.href ='yoururl';< / script> 。它不是一个很酷的解决方案，但它的工作。

I have a SmartGWT app and in it a Filter in which I'm trying to figure out (on login) if the request should be forwarded (e.g. desktop to mobile). The code executes and the browser makes a get request but doesn't get a response and doesn't do a redirect. I've tried with http://google.com and that didn't work too so it must be something else.

public void doFilter(ServletRequest req, ServletResponse res,
        FilterChain chain) throws ServletException, IOException {

    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;
    HttpSession session = request.getSession();

    WURFLHolder wurfl = (WURFLHolder) getFilterConfig().getServletContext().getAttribute(WURFLHolder.class.getName());

    WURFLManager manager = wurfl.getWURFLManager();

    Device device = manager.getDeviceForRequest(request);

    boolean webBrowser = isWebBrowser(device);

    String path = ((HttpServletRequest) request).getRequestURI();

    boolean isBrowserOnMobile = true; // webBrowser && path.contains(MOBILE_REQ_PATH);

    boolean isMobileOnDesktop = !webBrowser && path.contains(DESKTOP_REQ_PATH);

    if (isBrowserOnMobile || isMobileOnDesktop) {
        if (isBrowserOnMobile) {
            path = "http://www.google.com";
        } else {
            path = "/PregledPredmeta/MobileAppEntryPoint.html";
        }
        response.encodeRedirectURL(path);
        response.sendRedirect(path);
        return;

......

解决方案

Did you send any content to the HTTP response before using response.sendRedirect()? To use HTTP Redirect HEADER, you can't send any response to the browser. Even space or line-break/new-line can stop the redirect.

If you've checked all the code and make sure you haven't sent any content to the browser, you can use a JavaScript redirection <script>location.href='yoururl';</script>. Its not a cool solution, but it works.

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