获取项目路径详解

如访问 ：http://localhost:8080/TestM/userInfo.do?jflkd=fsadfe&jkdfh=fef 路径

request.getScheme() ; ---> http

request.getHeader("host");  ---> localhost:8080

request.getRequestURI();  ---> /TestM/userInfo.do

request.getQueryString(); --->  jflkd=fsadfe&jkdfh=fef