在Servlet与JSP中取得当前文件所在的相对路径与绝对路径

System.out.println("根目录所对应的绝对路径:"?+?request.getServletPath()?+?"");?
String?strPathFile?=?request.getSession().getServletContext().getRealPath(request.getRequestURI());?
System.out.println("文件的绝对路径:"?+?strPathFile?+?"");?
String?strDirPath?=?new?File(request.getSession().getServletContext().getRealPat(request.getRequestURI())).getParent();?
System.out.println("目录的绝对路径:"?+?strDirPath?+?"");?
this.getServlet().getServletContext().getRealPath("/");//在struts的action中取得当前系统的根目录

　举例：http://localhost:7001/myservlet/somepath/test?someparam=somevalue
request.getPathInfo()：返回/somepath/test
request.getRequestURL()：返回http://localhost:7001/myservlet/somepath/test
request.getRequestURI()：返回/myservlet/somepath/test
request.getServletPath()：返回/myservlet
request.getQueryString()：返回someparam=somevalue
??? request.getContextPath();? 返回项目名/myservlet