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

问题描述

我试图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.我已经搜索过，但我发现的是 sendRedirect() 方法.我在过滤器中的响应对象上找不到此方法.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 a filter to the login page but I don't know how to redirect from servlet. I've searched but what I find is sendRedirect() method. I can't find this method on my response object in the filter. What's the cause? How can I solve this?

推荐答案

在 Filter 中，响应是 ServletResponse 而不是 HttpServletResponse.因此，将转换为 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");

也不要忘记在最后调用 return;.

Also don't forget to call return; at the end.

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