jsp - Servlet 路径 "/"返回任何请求模式的 servlet 内容

Question

当我用路径映射 servlet 时:

<servlet>
    <servlet-name>Home1Servlet</servlet-name>
    <servlet-class>com.project.servlets.Home1Servlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Home1Servlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

然后当我通过以下任何路径从浏览器请求 servlet 时:

http://localhost:8084/project/
http://localhost:8084/project/asd
http://localhost:8084/project/why
http://localhost:8084/project/hell

所有这些请求都返回相同的 Home1Servlet 内容。为什么？

如何将 servlet 映射到路径“/”？

我正在使用 Apache Tomcat 6.0.26、Java EE 5。上下文路径是:/project

Answer 1

如果您只想将 servlet 映射到根 url，则使用空映射:

<url-pattern></url-pattern>

它在 Servlet 规范 12.2 中有描述:

The empty string ("") is a special URL pattern that exactly maps to the application's context root, that is, requests of the form host:port/<context_root>/. In this case the path info is / and the servlet path and context path is empty string ("").