Java tutorial
// Copyright 2016 Google Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // //////////////////////////////////////////////////////////////////////////////// package com.google.util; import javax.servlet.http.HttpServletRequest; import com.google.common.base.Strings; public class JspUtil { public static boolean isNullOrEmpty(String value) { return Strings.isNullOrEmpty(value); } public static String nullToEmpty(String value) { return Strings.isNullOrEmpty(value) ? "" : value; } public static String nullSafeGetParameter(HttpServletRequest request, String parameter) { return nullToEmpty(request.getParameter(parameter)); } public static String nullSafeGetAttribute(HttpServletRequest request, String parameter) { return nullToEmpty((String) request.getAttribute(parameter)); } }