Here you can find the source of encode(Charset charset, String string)
public static byte[] encode(Charset charset, String string)
//package com.java2s; /*/* w w w.j av a 2s. c o m*/ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 2012-2013 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * http://glassfish.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at packager/legal/LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." If you don't indicate a single choice of license, a * recipient has the option to distribute your version of this file under * either the CDDL, the GPL Version 2 or to extend the choice of license to * its licensees as provided above. However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.charset.CharacterCodingException; import java.nio.charset.Charset; import java.nio.charset.CharsetEncoder; import java.nio.charset.CoderResult; public class Main { public static byte[] encode(Charset charset, String string) { CharsetEncoder ce = charset.newEncoder(); int en = scale(string.length(), ce.maxBytesPerChar()); byte[] ba = new byte[en]; if (string.length() == 0) return ba; ce.reset(); ByteBuffer bb = ByteBuffer.wrap(ba); CharBuffer cb = CharBuffer.wrap(string); try { CoderResult cr = ce.encode(cb, bb, true); if (!cr.isUnderflow()) cr.throwException(); cr = ce.flush(bb); if (!cr.isUnderflow()) cr.throwException(); } catch (CharacterCodingException x) { // Substitution is always enabled, // so this shouldn't happen throw new Error(x); } return safeTrim(ba, bb.position()); } private static int scale(int len, float expansionFactor) { // We need to perform double, not float, arithmetic; otherwise // we lose low order bits when len is larger than 2**24. return (int) (len * (double) expansionFactor); } private static byte[] safeTrim(byte[] ba, int len) { if (len == ba.length && (System.getSecurityManager() == null)) { return ba; } else { return copyOf(ba, len); } } private static byte[] copyOf(byte[] original, int newLength) { byte[] copy = new byte[newLength]; System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength)); return copy; } }