如何在servlet过滤器中重定向？ [英] How to redirect in a servlet filter?

问题描述

我正在尝试找到一种方法将我的请求从过滤器重定向到登录页面，但我不知道如何从servlet重定向。我搜索了但我找到的是 sendRedirect（）方法。我在过滤器中的响应对象上找不到这个方法。原因是什么？我该如何解决这个问题？

I'm trying to find a method to redirect my request from filter to login page but I don't know how to redirect from servlet. I searched but what I find is sendRedirect() method. I can't find this method on my response obect in filter. What's the cause? How can I solve this?

推荐答案

在过滤器中，响应是 ServletResponse 而不是 HttpServletResponse .Hence执行转换为 HttpServletResponse 。

In Filter the response is of ServletResponse rather than HttpServletResponse.Hence do the cast to HttpServletResponse.

HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.sendRedirect("/login.jsp");

如果使用上下文路径：

httpResponse.sendRedirect(req.getContextPath() + "/login.jsp");

也不要忘记致电 return; at at结束。

Also dont forget to call return; at the end.

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