Here you can find the source of formatMessage(String messageKey, Locale locale)
public static String formatMessage(String messageKey, Locale locale)
//package com.java2s; /*/*from w w w .j a v a2 s.com*/ * 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. */ import java.util.ResourceBundle; import java.util.Locale; import java.text.MessageFormat; public class Main { public static String formatMessage(String messageKey, Locale locale) { MessageFormat mf = new MessageFormat(getMessageString(messageKey, locale)); return mf.format(new Object[0]); } public static String formatMessage(String messageKey, Object messsage, Locale locale) { MessageFormat mf = new MessageFormat(getMessageString(messageKey, locale)); Object[] args = new Object[1]; args[0] = messsage; return mf.format(args); } public static String formatMessage(String messageKey, Object[] messages, Locale locale) { MessageFormat mf = new MessageFormat(getMessageString(messageKey, locale)); return mf.format(messages); } private static String getMessageString(String messageKey, Locale locale) { final ResourceBundle resourceBundle = ResourceBundle .getBundle("org.grouter.common.exception.GrouterResources", locale); return resourceBundle.getString(messageKey); } }