web项目如何拼凑项目资源路径

在jsp中写了如下代码：

<%

    String path1=request.getScheme();

    String path2=request.getServerName();

    int path3=request.getServerPort();

    String path4=request.getContextPath();

    System.out.println(path1);

    System.out.println(path2);

    System.out.println(path3);

    System.out.println(path4);

    System.out.println("----------");

%>

控制台输出如下：

http

localhost

8080

/pro_1000_war_exploded

----------

即在项目中可使用如下拼凑的链接

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";