如何防止静态资源被映射到/* 的前端控制器 servlet 处理 [英] How to prevent static resources from being handled by front controller servlet which is mapped on /*

问题描述

我有一个充当前端控制器的 servlet.

I have a servlet which acts as a front controller.

@WebServlet("/*")

然而，这也处理 CSS 和图像文件.我怎样才能防止这种情况?

However, this also handles CSS and image files. How can I prevent this?

推荐答案

您有 2 个选择:

1. 使用更具体的 URL 模式，例如 /app/* 或 *.do，然后让所有页面请求匹配此 URL 模式.另请参阅设计模式基于网络的应用程序

1. Use a more specific URL pattern such as /app/* or *.do and then let all your page requests match this URL pattern. See also Design Patterns web based applications

同1，但是你想对请求URL隐藏servlet映射；然后，您应该将所有静态资源放在一个公共文件夹中，例如 /static 或 /resources 并创建一个过滤器来检查请求 URL 是否与其不匹配，然后转发到 servlet.这是一个示例，假设您的控制器 servlet 是 @WebServlet("/app/*") 并且过滤器是 @WebFilter("/*") 和所有静态资源都在 /resources 文件夹中.

The same as 1, but you want to hide the servlet mapping from the request URL; you should then put all static resources in a common folder such as /static or /resources and create a filter which checks if the request URL doesn't match it and then forward to the servlet. Here's an example which assumes that your controller servlet is a @WebServlet("/app/*") and that the filter is a @WebFilter("/*") and that all your static resources are in /resources folder.

HttpServletRequest req = (HttpServletRequest) request;
String path = req.getRequestURI().substring(req.getContextPath().length());

if (path.startsWith("/resources/")) {
    chain.doFilter(request, response); // Goes to default servlet.
} else {
    request.getRequestDispatcher("/app" + path).forward(request, response); // Goes to your controller.
}

另见如何访问静态资源在/*.

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