jsp中获取当前文件路径详解编程语言

<%   
	String path1 = application.getRealPath(request.getRequestURI()); //当前请求的JSP文件的物理路径 
	String path2 = application.getRealPath("/");                     //当前WEB应用的物理路径 
	 
	String path3 = request.getRequestURI(); 
	StringBuffer path4 = request.getRequestURL();      //getRequestURL()返回的是StringBuffer 
	 
	String virtualPath = request.getServletPath();     //虚拟路径  
	String realPath = request.getRealPath(virtualPath);//物理路径 
%>