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A fork of com.sun.jersey:jersey-json:1.19.4 that uses Jackson2 instead of EOL Jackson1.
There is a newer version: 1.22.0
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2011 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
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 */
package com.sun.jersey.json.impl.writer;

import java.util.Formatter;

/**
 *
 * @author japod
 */
public class JsonEncoder {

    public static String encode(String text) {
        if ((null == text) || (text.length() == 0)) {
            return text;
        }
        Formatter formatter = new java.util.Formatter();
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < text.length(); i++) {
            char c = text.charAt(i);
            switch (c) {
                case '"':
                    result.append("\\\"");
                    break;
                case '\\':
                    result.append("\\\\");
                    break;
                case '\b':
                    result.append("\\b");
                    break;
                case '\f':
                    result.append("\\f");
                    break;
                case '\n':
                    result.append("\\n");
                    break;
                case '\r':
                    result.append("\\r");
                    break;
                case '\t':
                    result.append("\\t");
                    break;
                default:
                    if (c < ' ') { // TODO: what about c > 255 ???
                        result.append(formatter.format("\\u%04X", (int)c));
                    } else {
                        result.append(c);
                    }
            }
        }
        return result.toString();
    }
}