url-pattern expression

SRV.11.2 Specification of Mappings In theWeb 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. • 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. 1. 以'/'开始，以'/*'结果对应的是路径匹配 /../..../* 2. 以'*.'前缀扩展名跟后面用户资源类型匹配 *.gif 3. 以url-pttern='/'表示匹配web context的根 4. 其它的url-pattern格式用于具体匹配