java - WebServlet - 带有两个字符的 urlPatterns

Question

我正在使用如下所示的 WebServlet 注释:

@WebServlet( urlPatterns = {"/en", "/de", "/fr"})  
public class GeoServlet {  
 // servlet code goes here  
}

如您所见，我需要在 URL 中定义每个地理区域，但我不想这样说allow all patterns from a-z but limit the pattern by two chars

例如:

@WebServlet( urlPatterns = {"/[a-z]"}{2}  )

我怎样才能做到这一点？谢谢。

Answer 1

不，没有办法做到这一点。 Servlet Specification定义映射的语法

In the Web application deployment descriptor, the following syntax is used to define mappings:

• A string beginning with a ‘/’ character and ending with a ‘/*’ suffix is used for path mapping.
• A string beginning with a ‘*.’ prefix is used as an extension mapping.
• The empty string ("") is a special URL pattern that exactly maps to the application's context root, i.e., requests of the form http://host:port/<contextroot>/. In this case the path info is ’/’ and the servlet path and context path is empty string (““).
• A string containing only the ’/’ character indicates the "default" servlet of the application. In this case the servlet path is the request URI minus the context path and the path info is null.
• All other strings are used for exact matches only.

它不识别正则表达式。

考虑使用 Front Controller它在内部有自己的映射。