在JSF 2中如何进行Web过滤? [英] How do a web filter in JSF 2?
问题描述
我创建了此过滤器:
public class LoginFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpSession session = req.getSession();
if (session.getAttribute("authenticated") != null || req.getRequestURI().endsWith("login.xhtml")) {
chain.doFilter(request, response);
} else {
HttpServletResponse res = (HttpServletResponse) response;
res.sendRedirect("login.xhtml");
return;
}
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void destroy() {
}
}
这是我的结构:
然后将过滤器添加到web.xml:
And then I add the filter in the web.xml:
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
过滤器可以正常工作,但会不断显示此错误:
The filter works as it should but keeps giving me this error:
"Was not possible find or provider the resource, login"
在那之后,我的表情就不再起作用了.
And after that my richfaces doesn't works anymore.
我该如何解决?还是正确创建网络过滤器?
How can I solve that ? Or create a web filter correctly ?
推荐答案
传递给sendRedirect()
的任何路径相对URL(即不以/
开头的URL)将相对于当前请求URI.我了解登录页面位于 http://localhost:8080/contextname/login.xhtml .因此,例如,如果您访问 http://localhost:8080/contextname/pages/user/some.xhtml ,那么此重定向调用实际上将指向 http://localhost:8080/contextname/pages/user/login .xhtml ,我认为它不存在.再次在浏览器地址栏中查看URL.
Any path-relative URL (i.e. URLs which do not start with /
) which you pass to sendRedirect()
will be relative to the current request URI. I understand that the login page is at http://localhost:8080/contextname/login.xhtml. So, if you for example access http://localhost:8080/contextname/pages/user/some.xhtml, then this redirect call will actually point to http://localhost:8080/contextname/pages/user/login.xhtml, which I think don't exist. Look at the URL in your browser address bar once again.
要解决此问题,请重定向到相对于域的URL,即以/
开头.
To fix this problem, rather redirect to a domain-relative URL instead, i.e. start the URL with /
.
res.sendRedirect(req.getContextPath() + "/login.xhtml");
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