jsp设置网页根目录

  <%   
    String path = request.getContextPath();   
    String basePath = request.getScheme()+"://" +request.getServerName()+":" +request.getServerPort()+path+"/" ;   
    //System.out.println("path="+path);
    //System.out.println("basePath="+basePath);
    %>   
    <base href="/go.html?url=<%=basePath%>" >   <%   
    String path = request.getCont