获得项目的更目录路径

String path = request.getContextPath();  System.out.println(path); 结果：/uploadshiping  （uploadshiping为项目的名字）

 String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
System.out.println(basePath);    结果为：http://localhost:8080/uploadshiping/