java获取客户端ip（经过多次代理）提示StringUtilscannotberesolved需要先importorg.apache.commons.lang3.StringUtils;/*内含common-lang3.jarcommons-lang3-3.9-bin.zipcommons-lang3-3.9-src.zip使用说明.txt*/publicstaticStringgetClientIp(HttpServletRequestrequest){Stringip=request.getHeader("X-Fo