•  获取服务端访问信息   

public static String getUrl(HttpServletRequest request){              String url = "";                    if(request != null){              String scheme       = request.getScheme();              String host         = request.getLocalAddr();              int post        = request.getLocalPort();              String contextPath  = request.getContextPath();                                                          url = scheme + "://" + host + ":" + String.valueOf(post) + "/" + contextPath + "/";           }          return url;       }