在JSF中注销后用户单击“后退"按钮时，重定向到登录页面 [英] Redirect to login page when user clicks on back button after logout in JSF

问题描述

当用户单击注销页面时，它将带他进入login.xhtml.现在，当用户单击后退"按钮时，它会将用户带到注销之前的页面，而我试图通过使用doFilter来避免这种情况在很多帖子中都提到过，我的代码是:

When the user clicks on the logout page it takes him to the login.xhtml.Now when the user clicks the back button it is taking him to the page before logout and I am trying to avoid this by using the doFilter which has been mentioned in many posts and my code is:

    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;
    response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); 
    response.setHeader("Pragma", "no-cache"); // HTTP 1.0.
    response.setDateHeader("Expires", 0); // Proxies.
    chain.doFilter(req, res);

但是它不起作用.我还读了一篇文章，说如果URL有http，那么它不起作用吗?您能建议我如何避免这种情况，并让用户在注销后单击后退"按钮时进入登录页面.

But it did not work.I also read in one post that if the URL has http then it does not work? Could you suggest how I can avoid this behavior and make the user go to the login page when he clicks on the back button after logout.

推荐答案

我不知道问题的原因是什么，但是请注意，在您的Web过滤器中，您应该以任何下面的过滤器为我工作的方式跳过JSF资源.所有.xhtml页面都可以尝试

I do not know what is the reason of your problem but note that in your web filter you should Skip JSF resources any way the follwing filter is working for me in all .xhtml pages try it

import java.io.IOException;
import javax.faces.application.ResourceHandler;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class NoCacheFilter
 */
  @WebFilter(urlPatterns = {"*.xhtml"})
  public class NoCacheFilter implements Filter {

/**
 * Default constructor. 
 */
public NoCacheFilter() {
    // TODO Auto-generated constructor stub
}

/**
 * @see Filter#destroy()
 */
public void destroy() {
    // TODO Auto-generated method stub
}

/**
 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
 */

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    HttpServletRequest req = (HttpServletRequest) request;
    HttpServletResponse res = (HttpServletResponse) response;

    if (!req.getRequestURI().startsWith(req.getContextPath() + ResourceHandler.RESOURCE_IDENTIFIER)) { // Skip JSF resources (CSS/JS/Images/etc)
        res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
        res.setHeader("Pragma", "no-cache"); // HTTP 1.0.
        res.setDateHeader("Expires", 0); // Proxies.
    }

    chain.doFilter(request, response);
}
/**
 * @see Filter#init(FilterConfig)
 */
public void init(FilterConfig fConfig) throws ServletException {
    // TODO Auto-generated method stub
}

}

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