Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.jbpcc.admin.util; import java.util.logging.Level; import org.apache.commons.configuration.ConfigurationException; import org.apache.commons.configuration.PropertiesConfiguration; import org.apache.log4j.Logger; public class ApplicationProperties { private static final Logger LOGGER = Logger.getLogger(ApplicationProperties.class.getName()); private static ApplicationProperties instance = null; private static PropertiesConfiguration config = null; private ApplicationProperties() { } public static void init(String fileName) { try { config = new PropertiesConfiguration(fileName); } catch (ConfigurationException ex) { LOGGER.error(ex, ex.getCause()); } } public static synchronized ApplicationProperties getInstance() { if (instance == null) { instance = new ApplicationProperties(); } return instance; } public String getProperty(String paraName) { String value = null; if (config != null && config.containsKey(paraName)) { value = config.getString(paraName); } return value; } public void setProperty(String paraName, String paraValue) { try { config.setProperty(paraName, paraValue); config.save(); } catch (ConfigurationException ex) { ex.printStackTrace(); } } }