1.String pathurl = request.getServletContext().getRealPath("/");
获取到项目的绝对地址,例如: d:/a/a/aaa
2.String weburl = request.getScheme() + "://" + request.getServerName()+ ":" + request.getServerPort() + request.getContextPath();
获取项目的ip地址,例如: http://IP:端口号/项目名 http://172.0.0.1:8080/aaa