学步园

  request.getScheme()            http
  request.getServerName()         127.0.0.1
  request.getServerPort()          8080
  request.getContextPath()        项目名称
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

当前页的根路径basePath为 http://localhost:8080/studyteach