001/* 002 * Copyright 2012-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.system; 018 019/** 020 * Access to system properties. 021 * 022 * @author Phillip Webb 023 * @since 2.0.0 024 */ 025public final class SystemProperties { 026 027 private SystemProperties() { 028 } 029 030 public static String get(String... properties) { 031 for (String property : properties) { 032 try { 033 String override = System.getProperty(property); 034 override = (override != null) ? override : System.getenv(property); 035 if (override != null) { 036 return override; 037 } 038 } 039 catch (Throwable ex) { 040 System.err.println( 041 "Could not resolve '" + property + "' as system property: " + ex); 042 } 043 } 044 return null; 045 } 046 047}